Measurement of the Permeability in a Ferrite Core by Superimposing Bias Current
|
|
- Roger Davidson
- 6 years ago
- Views:
Transcription
1 Journal of International Council on Electrical Engineering Vol. 4, No. 1, pp.67~73, Measurement of the Permeability in a Ferrite Core by Superimposing Bias Current Kousuke Kikuchi*, Tomohiko Kanie** and Takashi Takeo Abstract In this study, we investigate measurement of the magnetic permeability in a ferrite core at RF frequencies when bias current is superimposed on an RF signal with a view to adaptively controlling performance of RF transformers using ferrite cores. A measurement arrangement used comprises a short microstrip line (MSL) circuit including a coaxial conductor (CC) structure consisting of an electrically grounded metal pipe, a center conductor and a sample between them. A bias tee network is incorporated into this MSL-CC circuit in order to superimpose direct current on an RF signal. Using this arrangement, a dependence of permeability on an amplitude of superimposed bias current was measured at frequencies of 10 MHz to 500 MHz. Reliability of the measurement results is discussed based on several experimental data, implying that the method has an accuracy less than 10 % at most of the above frequencies. Keywords: Bias current, Bias tee network, Ferrite, Permeability measurement 1. Introduction Ferrite is used in many RF devices, such as a transformer, and EMC components [1]-[]. For example, when designing an RF transformer, which is a typical RF device, engineers often select appropriate permeability or physical dimensions of a ferrite core to satisfy a specification designated for the device. Since this approach is costly and time-consuming with respect to manufacturing, the authors have proposed in a previous work [3] an adaptive method of controlling the permeability of a ferrite core of RF transformers by superimposing bias current on an RF signal. This proposed method provides us a means for a given ferrite core to vary its permeability and thus enables us to alleviate the above mentioned issue. In addition, this technique is beneficial when applied to compensation of temperature dependent nature of ferrite, for the permeability of a magnetic material is generally dependent on temperature [4]. However, how the permeability of a ferrite core changes when bias current is superimposed should be known or measured so as to actually implement the above mentioned adaptive control of RF device performance. In this study, we propose a relatively simple and practical measurement Corresponding Author: Graduate School of Engineering, Mie University, Japan (takeo@phen.mie-u.ac.jp) * Graduate School of Engineering, Mie University, Japan ** Kanie Professional Engineer Office, Japan (kanie@aioros.ocn.ne.jp) Received: December 5, 013; Accepted: January 6, 014 method employing a combined microstrip line-coaxial conductor (MSL-CC) circuit equipped with a bias tee network and report experimental results obtained with this method. Furthermore, the accuracy of the measurement is also discussed through several experiments and an electromagnetic simulation technique..1 Measurement Circuit. Measurement Procedure The arrangement used here to measure permeability when a bias current is superimposed on an RF signal is illustrated in Fig. 1. Fig. 1. Measurement circuit consisting of the combined microstrip line-coaxial conductor equipped with the bias tee network. In this circuit, a coaxial conductor (CC) structure 67
2 Measurement of the Permeability in a Ferrite Core by Superimposing Bias Current composed of a center conductor and an electrically grounded coaxial metal pipe is located at the end of microstrip lines each having a characteristic impedance of 50 ohms [5]. A measurement sample is housed between the center conductor and the pipe. In addition, a resistor (50 ohms) is connected to the MSLs for achieving better measurement accuracy. Furthermore, in front of the sample, a bias tee network is incorporated to superimpose bias current at the sample.. Equivalent Network We utilize an equivalent network as shown in Fig. for the above mentioned circuit so as to determine the permeability of a sample from the circuit impedance Z M. Here, the coaxial conductor structure is expressed as the L type network enclosed by the dotted rectangle, where circuit elements R m, L m, and C m are given as a function of parameters (sizes and permeability) of the sample and the coaxial conductor as described in the following. Namely, when electrical current flows through the center conductor and the metal pipe, inductance and resistance given by and L l s R R μ ln π R1R + μ ln ( R R ) m = / 3 R m (1) ω μ ls = ln( R3 / R ) () π are caused. Here, μ = μ jμ is the complex permeability of the sample, μ 0 is the permeability in vacuum, ω is the angular frequency, l s is the length of the sample, R 1 is the outer radius of the center conductor, R and R 3 are the inner and outer radii of the sample, respectively, and R 4 is the inner radius of the metal pipe. The equivalent network for the sample is expressed as a series connection of the resistance R m and inductance L m [6]. Furthermore, the two conductors (the center conductor and the electrically grounded pipe) generate a capacitive component C m, which is given by C m 1 = πl s (3) 1 R R4 1 ln + ln( R3 R ) ε 0 R1R 3 ε where ε and ε 0 are the permittivities of the sample and vacuum, respectively. Fig.. Equivalent network for the measurement circuit. If the impedance Z M of the coaxial conductor structure expressed by the L type network in Fig. is determined, one can calculate the permeability of the sample by a circuit analysis using eqs. (1) through (3) as will be described in the next subsection..3 Permeability Determination Procedure As mentioned in the previous subsection, the impedance Z M of the measurement portion indicated by the dotted rectangle in Fig. should be known in order to obtain the permeability of the sample. One of methods to accomplish this is to measure the impedance Z M of the whole measurement circuit and then remove contributions of the circuit components other than Z M, i.e. the load Z L, the bias tee network, etc. Following this procedure, the first step in the permeability determination procedure is subtraction of the impedance of the load Z L and the capacitor C 1 from the whole circuit impedance Z M obtained through measurement. Then, the effect of the components such as the choke coil connected in parallel with the sample was canceled by an elementary circuit analysis. In this way, we obtain the impedance Z M of the coaxial structure. This impedance value of the CC structure including the sample should be equal to the impedance enclosed by the dotted rectangle in Fig.. Namely, where Aωμ Z M = α1μ + β1μ + α1μ + γ 1 (4) α μ + β μ + α μ + γ + j α1μ + β1μ + α1μ + γ 1 68
3 Kousuke Kikuchi, Tomohiko Kanie and Takashi Takeo ls R A = ln π R ω C m A (5) α = (6) 1 m m β = ω C A( ω C B 1) (7) μ 0lS R R B = ln π R1R 1 = ( ω C m B 1) 4 3 (8) γ (9) 3 C m A α = ω (10) m B β = ωa(1 ω C ) (11) m B γ = ωb(1 ω C ) (1) Eq. (4) is a quadratic complex equation for unknown variables μ and μ. By solving this equation, we obtain the complex permeability. large at higher frequencies. Sample Metal pipe Bias-T network Fig. 3. Simulation model. 3. Electromagnetic Simulation We conducted an electromagnetic simulation based on a finite element method to check the validity of the procedure for determining the permeability of a ferrite sample described in the previous section. A measurement circuit model (referred to as C1 hereinafter) used in the simulation is shown in Fig. 3 and its major parameters are listed in Table 1. In the simulation, we employed results of impedance measurement for the choke coil in the bias tee network, which will be described in the next section. Namely, we used the measurement results for the impedance of the choke coil in the bias tee network. The electromagnetic simulation done in this way gives us the impedance Z M of the measurement circuit. Table 1. Parameters of the measurement circuit and the sample Initial core permeability Core length Core O.D. Core I.D. Metal pipe I.D. Center conductor O.D mm 3.5mm 0.7mm 5.0 mm 0.65 mm The value of Z M, which was obtained by removing the effect of the load Z L and the bias tee network was substituted into eq. (4) and the equation was solved with a Newton-Raphson method. The results are illustrated in Fig. 4. As can be seen, the values of the sample permeability obtained from the simulation are in agreement with the true values which are those used as the sample permeability in the simulation, indicating the validity of the present measurement procedure, though the error for μ is slightly Fig. 4. Results of an electromagnetic simulation for the permeability measurement. 4. Results of Permeability Measurement Before measuring the bias current dependence of the permeability in a ferrite core, we have experimentally 69
4 Measurement of the Permeability in a Ferrite Core by Superimposing Bias Current checked the cancellation procedure of the bias tee network. For that purpose, in addition to the circuit C1, we prepared another measurement circuit (Circuit C1 ) which is the same as C1 except that it does not have the bias tee network. for the circuit C1. In addition, with regard to the circuit C1, we subtracted the influence of the bias tee network, especially of the choke coil, from the measured circuit impedance Z M. As illustrated in Fig. 5, the measured impedance of the choke coil has a resonant nature in the frequency range of interest. Nevertheless, the difference between the impedance of C1 when I b = 0 and the effect of the bias tee network was canceled and that of C1 was less than a few percents as shown in Fig. 6, validating our procedure for measuring the dependence of permeability on the bias current. Fig. 5. Measurement results for the impedance of the choking coil. Fig. 7. Measurement results for the permeability by superimposing bias current: real and imaginary components. Fig. 6. Results of the effect of the choking coil cancellation. Then, the impedances of the two circuits were measured. In this measurement, the bias current I b was set to be zero After confirming the validity of our procedure experimentally in this way, we proceeded to permeability measurements by applying bias current. Ferrite samples having the parameters listed in Table 1 were purchased from Tomita Electric Co., Ltd. [7]. In the measurements, bias currents of up to 500 ma were superimposed on an RF signal from a network analyzer. Measurement results are illustrated in Fig. 7, indicating that both the real and 70
5 Kousuke Kikuchi, Tomohiko Kanie and Takashi Takeo imaginary components of the complex permeability vary significantly according to the bias current change especially at low frequencies. More specifically, when the bias current was varied from 0 ma to 500 ma, the real and imaginary components of permeability at a frequency of 10 MHz decrease from about 40 and 400 to about 135 and 100, respectively. 5. Accuracy Evaluation In order to check the measurement results in the previous section or examine the accuracy of the measurement, we prepared another circuit C which has the same sample as the circuit C1 but the inner diameter of the metal pipe is different (R = 3.5 mm) from C1. and 500 ma. Although the difference between the results for C1 and C is slightly large for the imaginary component in the case of I b = 100 ma, it is relatively small for the other conditions, and implying that the accuracy in this measurement is comparable to that with conventional methods [8], [9]. As another way to examine the accuracy in the permeability measurement or check the validity of the results for the permeability measurements obtained in the previous section, we measured transmission characteristics of the ferrite sample using a circuit shown in Fig. 9 and compared them to those predicted by simulation. Microstrip lines and a coaxial conductor in this circuit were designed in the same way as described in Fig. 1 and Fig., while another bias tee network is added after the sample so as to allow the bias current to flow to ground and the RF signal to flow to the output port, respectively. Fig. 9. Arrangement for measuring the transmission characteristics of the ferrite sample. Fig. 8. Comparison of the measurement results for circuit C1 and C: real and imaginary components. Since the samples of the two circuits (C1 and C) are the same, the permeability values measured for C1 and C should coincide. Permeability values obtained from C1 and C are given in Fig. 8 for bias currents of 100 ma, 300 ma Fig. 10. Comparison between the results of the experiments and the electromagnetic simulation for the transmission characteristics. Measured transmission S 1 is plotted in Fig. 10 for the bias currents of 0 ma to 500 ma. As can be seen, it monotonically increases with the bias current. In Fig. 10, 71
6 Measurement of the Permeability in a Ferrite Core by Superimposing Bias Current transmission characteristics predicted by an electromagnetic simulation using the permeability values of the sample obtained by the measurement in the previous section are also plotted. Although the difference between the measurement and the simulated results are slightly larger in the frequency range of 300 MHz to 500 MHz, it remains within 0.5 db in terms of S 1 at most frequencies. To examine how much this difference or error in S 1 can be in terms of permeability, S 1 was calculated by changing permeability values by 10 % to 30% from the measured one in the case of I b = 100 ma. Results are shown in Fig. 11, which indicates that the difference between the measurement and the simulation corresponds to about 10 % in terms of permeability. Fig. 11. Variation of the transmission characteristics S1 by changing the permeability value by 10% to 30%. 6. Conclusion Permeability measurement with bias current superimposed has been investigated at RF frequencies (10 MHz to 500 MHz) using the combined microstrip linecoaxial conductor arrangement equipped with a bias tee network. The experimental results show that the permeability of a ferrite core can vary significantly, e.g. from 50 to 140 for μ r and from 400 to 100 for μ r at a frequency of 10 MHz by applying a bias current of 500 ma. In order to check the validity of the results, two kinds of investigations were further made. Firstly, permeability measurement was conducted for two different circuits having the same sample on it and the results from each were compared. In the other investigation, transmission characteristics of a transformer having a ferrite sample as a core material were compared between experiments and an electromagnetic simulation. Both investigations for checking the validity of the permeability measurement indicate that the error remains within 10 % at most of the frequencies. The measurement technique presented in this study enables us to discuss performance of an RF transformer when bias current is superimposed on it. This is the subject of future study. Acknowledgements The authors would like to thank R. Goudy of Nissan Technical Center N.A. for his helpful comments. References [1] R. M. Bozorth, Ferromagnetism, IEEE Press, New York, 1993.MIT, 1981, p [] A. Goldman, Handbook of Modern Ferromagnetic Materials, Kluwer Academic Publishers, Norwell, [3] T. Aoyama, Y. Shibata, T. Kanie, and T. Takeo, Active Control of RF Splitter Isolation by Superimposing Bias Current, IEICE Trans. Electron., vol. E95-C, no.7, pp , July 01. [4] T. Aoyama, Y. Shibata, T. Kanie, Y. Noro, and T. Takeo, Adaptive Compensation Method for the Temperature Dependence of RF Transformer Isolation, Journal of ICEE, vol., no.4, pp , Oct., 01. [5] D. M. Pozar, Microwave Engineering, John Wiley & Sons, New Jersey, 005. [6] T. Aoyama, M. Katsuda, T. Kanie, and T. Takeo, Alternative Method for Determining Permeability of a Ferrite Core by Using a Combined Microstrip Line- Coaxial Conductor, IEICE, Vol.E95-C, No.11 (01) [7] Tomita Electric Co., Ltd., Homepage, [8] J. B. Jarvis, M. D. Janezic, J. H. Grosvenor, Jr., and R. G. Geyer, Transmission/Reflection and Sort-Circuit Line Methods for Measuring Permittivity and Permeability, Natl. Inst. Stand. Technol., Tech. Note 1355-R, December [9] J. B. Jarvis, M. D. Janezic, B. F. Riddle, R. T. Johnk, P. Kabos, C. L. Holloway, R. G. Geyer, and C. A. Grosvenor, Measuring the Permittivity and Permeability of Lossy Materials: Solids, Liquids, Metals, Building Materials, and Negative-Index Materials, Natl. Inst. Stand. Technol., Tech. Note 1356, February
7 Kousuke Kikuchi, Tomohiko Kanie and Takashi Takeo Kousuke Kikuchi received a B.E. in physics engineering from Mie University in 01, where he is currently engaged in research on an electromagnetic simulation of R devices in the master s program at the Department of Physics Engineering. Tomohiko Kanie received a B.E. in electrical engineering from Meijo University in 1985, an M.E. in material science from the Japan Advanced Institute of Science and Technology in 1995, and a PhD degree from Mie University in 009. He was with Sendai Polytechnic College from 1995 to 1999 and Kinki Polytechnic College from 1999 to 001. Since 001, he has been the CEO of Aoyama Technology Inc. His major interest lies in RF passive circuit technology. Takashi Takeo received B.E., M.E. and PhD degrees in electrical engineering from Nagoya University in 1976, 1978 and 199, respectively. He joined the Nagoya Municipal Industrial Research Institute in 1978 and in 005, accepted a professorship at Mie University. His chief interests lie in the application of optical and RF technology. He is a member of the Japan Society of Applied Physics, the Laser Society of Japan and the Society of Instrument and Control Engineers. 73
Analysis of a PCB-Chassis System Including Different Sizes of Multiple Planes Based on SPICE
Analysis of a PCB-Chassis System Including Different Sizes of Multiple Planes Based on SPICE Naoki Kobayashi (1), Todd Hubing (2) and Takashi Harada (1) (1) NEC, System Jisso Research Laboratories, Kanagawa,
More informationA Simple Wideband Transmission Line Model
A Simple Wideband Transmission Line Model Prepared by F. M. Tesche Holcombe Dept. of Electrical and Computer Engineering College of Engineering & Science 337 Fluor Daniel Building Box 34915 Clemson, SC
More informationPulse Transmission and Cable Properties ================================
PHYS 4211 Fall 2005 Last edit: October 2, 2006 T.E. Coan Pulse Transmission and Cable Properties ================================ GOAL To understand how voltage and current pulses are transmitted along
More informationCharacterizing Electromagnetic Properties of Materials. Making Reliable Measurements at mm and Sub-mm Wavelengths
Characterizing Electromagnetic Properties of Materials at 110GHz and Beyond Jeffrey Hesler Shelley Begley Suren Singh Phil Bartley Virginia Diodes Inc. Agilent Technologies Agilent Technologies IMS Agenda
More informationAccurate Models for Spiral Resonators
MITSUBISHI ELECTRIC RESEARCH LABORATORIES http://www.merl.com Accurate Models for Spiral Resonators Ellstein, D.; Wang, B.; Teo, K.H. TR1-89 October 1 Abstract Analytically-based circuit models for two
More informationLab 1: Pulse Propagation and Dispersion
ab 1: Pulse Propagation and Dispersion NAME NAME NAME Introduction: In this experiment you will observe reflection and transmission of incident pulses as they propagate down a coaxial transmission line
More informationDipole Antennas. Prof. Girish Kumar Electrical Engineering Department, IIT Bombay. (022)
Dipole Antennas Prof. Girish Kumar Electrical Engineering Department, IIT Bombay gkumar@ee.iitb.ac.in (022) 2576 7436 Infinitesimal Dipole An infinitesimally small current element is called the Hertz Dipole
More informationDesign of a Regenerative Receiver for the Short-Wave Bands A Tutorial and Design Guide for Experimental Work. Part I
Design of a Regenerative Receiver for the Short-Wave Bands A Tutorial and Design Guide for Experimental Work Part I Ramón Vargas Patrón rvargas@inictel-uni.edu.pe INICTEL-UNI Regenerative Receivers remain
More informationMICROSTRIP AND WAVEGUIDE PASSIVE POWER LIMITERS WITH SIMPLIFIED CONSTRUCTION
Journal of Microwaves and Optoelectronics, Vol. 1, No. 5, December 1999. 14 MICROSTRIP AND WAVEGUIDE PASSIVE POWER IMITERS WITH SIMPIFIED CONSTRUCTION Nikolai V. Drozdovski & ioudmila M. Drozdovskaia ECE
More informationCOMPACT DESIGN AND SIMULATION OF LOW PASS MICROWAVE FILTER ON MICROSTRIP TRANSMISSION LINE AT 2.4 GHz
International Journal of Management, IT & Engineering Vol. 7 Issue 7, July 2017, ISSN: 2249-0558 Impact Factor: 7.119 Journal Homepage: Double-Blind Peer Reviewed Refereed Open Access International Journal
More informationOpen Access Property Analysis and Experimental Study of the Broadband Transmission-Line Transformer in Multimode Feed Network
Send Orders for Reprints to reprints@benthamscience.ae The Open Electrical Electronic Engineering Journal 215 9 153-159 153 Open Access Property Analysis and Experimental Study of the Broadband Transmission-Line
More informationAN3394 Application note
Application note Antenna design and impedance matching guidelines for CR95HF multiprotocol contactless transceiver IC Introduction The goal of this application note is to provide guidelines to design a
More informationInput Impedance, VSWR and Return Loss of a Conformal Microstrip Printed Antenna for TM 10 mode Using Polymers as a Substrate Materials
Input Impedance, VSWR and Return Loss of a Conformal Microstrip Printed Antenna for TM 10 mode Using Polymers as a Substrate Materials Ali Elrashidi 1, Khaled Elleithy 2, Hassan Bajwa 3 1 Department of
More informationDesign of Integrated LC Filter Using Multilayer Flexible Ferrite Sheets S. Coulibaly 1, G. Loum 1, K.A. Diby 2
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 232-3331, Volume 1, Issue 6 Ver. I (Nov Dec. 215), PP 35-43 www.iosrjournals.org Design of Integrated LC Filter
More informationBANDWIDTH ENHANCEMENT OF CIRCULAR MICROSTRIP ANTENNAS
BANDWIDTH ENHANCEMENT OF CIRCULAR MICROSTRIP ANTENNAS Ali Hussain Ali Yawer 1 and Abdulkareem Abd Ali Mohammed 2 1 Electronic and Communications Department, College of Engineering, Al- Nahrain University,
More informationRESONANT CAVITIES FOR DUPLEX FILTERS IN VHF REPEATERS: ANALISYS, IMPLEMENTATION, AND TESTING
RESONANT CAVITIES FOR DUPLEX FILTERS IN VHF REPEATERS: ANALISYS, IMPLEMENTATION, AND TESTING Gheorghe SAUCIUC Tehnical University Gheorghe Asachi of Iasi - Faculty of Electronics, Telecommunication and
More informationDesign and Simulation of a Quarter Wavelength Gap Coupled Microstrip Patch Antenna
Design and Simulation of a Quarter Wavelength Gap Coupled Microstrip Patch Antenna Sanjay M. Palhade 1, S. P. Yawale 2 1 Department of Physics, Shri Shivaji College, Akola, India 2 Department of Physics,
More informationSix-port scattering parameters of a three-phase mains choke for consistent modelling of common-mode and differential-mode response
Six-port scattering parameters of a three-phase mains choke for consistent modelling of common-mode and differential-mode response S. Bönisch, A. Neumann, D. Bucke Hochschule Lausitz, Fakultät für Ingenieurwissenschaften
More informationA Pin-Loaded Microstrip Patch Antenna with the Ability to Suppress Surface Wave Excitation
Progress In Electromagnetics Research C, Vol. 62, 131 137, 2016 A Pin-Loaded Microstrip Patch Antenna with the Ability to Suppress Surface Wave Excitation Ayed R. AlAjmi and Mohammad A. Saed * Abstract
More informationProgress In Electromagnetics Research C, Vol. 32, 43 52, 2012
Progress In Electromagnetics Research C, Vol. 32, 43 52, 2012 A COMPACT DUAL-BAND PLANAR BRANCH-LINE COUPLER D. C. Ji *, B. Wu, X. Y. Ma, and J. Z. Chen 1 National Key Laboratory of Antennas and Microwave
More informationA MINIATURIZED OPEN-LOOP RESONATOR FILTER CONSTRUCTED WITH FLOATING PLATE OVERLAYS
Progress In Electromagnetics Research C, Vol. 14, 131 145, 21 A MINIATURIZED OPEN-LOOP RESONATOR FILTER CONSTRUCTED WITH FLOATING PLATE OVERLAYS C.-Y. Hsiao Institute of Electronics Engineering National
More information3 GHz Wide Frequency Model of Surface Mount Technology (SMT) Ferrite Bead for Power/Ground and I/O Line Noise Simulation of High-speed PCB
3 GHz Wide Frequency Model of Surface Mount Technology (SMT) Ferrite Bead for Power/Ground and I/O Line Noise Simulation of High-speed PCB Tae Hong Kim, Hyungsoo Kim, Jun So Pak, and Joungho Kim Terahertz
More informationAn Investigation of the Effect of Chassis Connections on Radiated EMI from PCBs
An Investigation of the Effect of Chassis Connections on Radiated EMI from PCBs N. Kobayashi and T. Harada Jisso and Production Technologies Research Laboratories NEC Corporation Sagamihara City, Japan
More informationPHYSICS WORKSHEET CLASS : XII. Topic: Alternating current
PHYSICS WORKSHEET CLASS : XII Topic: Alternating current 1. What is mean by root mean square value of alternating current? 2. Distinguish between the terms effective value and peak value of an alternating
More informationSimulation of the Near-field of a Ferrite Antenna
Simulation of the Near-field of a Ferrite Antenna Alexey A. Kalmykov, Kirill D. Shaidurov, and Stanislav O. Polyakov Ural Federal University named after the first President of Russia B.N.Yeltsin Ekaterinburg,
More informationMicrowave Measurement and Quantitative Evaluation of Wall Thinning in Metal Pipes
th World Conference on Nondestructive Testing, 25-28 Oct 2008, Shanghai, China Microwave Measurement and Quantitative Evaluation of Wall Thinning in Metal Pipes Yang JU, Linsheng LIU, Masaharu ISHIKAWA
More informationON THE STUDY OF LEFT-HANDED COPLANAR WAVEGUIDE COUPLER ON FERRITE SUBSTRATE
Progress In Electromagnetics Research Letters, Vol. 1, 69 75, 2008 ON THE STUDY OF LEFT-HANDED COPLANAR WAVEGUIDE COUPLER ON FERRITE SUBSTRATE M. A. Abdalla and Z. Hu MACS Group, School of EEE University
More informationBy Hiroo Sekiya, Chiba University, Chiba, Japan and Marian K. Kazimierzuk, Wright State University, Dayton, OH
ISSUE: November 2011 Core Geometry Coefficient For Resonant Inductors* By Hiroo Sekiya, Chiba University, Chiba, Japan and Marian K. Kazimierzuk, Wright State University, Dayton, OH A resonant inductor
More informationOptimized shield design for reduction of EMF from wireless power transfer systems
This article has been accepted and published on J-STAGE in advance of copyediting. Content is final as presented. IEICE Electronics Express, Vol.*, No.*, 1 9 Optimized shield design for reduction of EMF
More information2/18/ Transmission Lines and Waveguides 1/3. and Waveguides. Transmission Line A two conductor structure that can support a TEM wave.
2/18/2009 3 Transmission Lines and Waveguides 1/3 Chapter 3 Transmission Lines and Waveguides First, some definitions: Transmission Line A two conductor structure that can support a TEM wave. Waveguide
More informationDevelopment and verification of printed circuit board toroidal transformer model
Development and verification of printed circuit board toroidal transformer model Jens Pejtersen, Jakob Døler Mønster and Arnold Knott DTU Electrical Engineering, Technical University of Denmark Ørsteds
More informationSEMICONDUCTOR AN548A MICROSTRIP DESIGN TECHNIQUES FOR UHF AMPLIFIERS MOTOROLA APPLICATION NOTE INTRODUCTION MICROSTRIP DESIGN CONSIDERATIONS
MOTOROLA SEMICONDUCTOR APPLICATION NOTE Order this document by AN548A/D AN548A DESIGN TECHNIQUES FOR UHF AMPLIFIERS Prepared by: Glenn Young INTRODUCTION This note uses a 25 watt UHF amplifier design as
More informationAN ABSTRACT OF THE THESIS OF
AN ABSTRACT OF THE THESIS OF Arien Sligar for the degree of Master of Science in Electrical and Computer Engineering presented on August 18, 2006. Title: On-Chip Crosstalk Suppression Schemes using Magnetic
More informationRadio Frequency Electronics
Radio Frequency Electronics Preliminaries II Guglielmo Giovanni Maria Marconi Thought off by many people as the inventor of radio Pioneer in long-distance radio communications Shared Nobel Prize in 1909
More informationAccuracy of Microwave Cavity Perturbation Measurements
918 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 49, NO. 5, MAY 2001 Accuracy of Microwave Cavity Perturbation Measurements Richard G. Carter, Member, IEEE Abstract Techniques based on the
More informationStudy on Transmission Characteristic of Split-ring Resonator Defected Ground Structure
PIERS ONLINE, VOL. 2, NO. 6, 26 71 Study on Transmission Characteristic of Split-ring Resonator Defected Ground Structure Bian Wu, Bin Li, Tao Su, and Chang-Hong Liang National Key Laboratory of Antennas
More informationΓ L = Γ S =
TOPIC: Microwave Circuits Q.1 Determine the S parameters of two port network consisting of a series resistance R terminated at its input and output ports by the characteristic impedance Zo. Q.2 Input matching
More informationExperimental Study of Sleeve Antennas Using Variable Capacitors
Experimental Study of Sleeve Antennas Using Variable Capacitors # Kengo Nishimoto, Ryosuke Umeno, Nobuyasu Takemura, Toru Fukasawa, Masataka Ohtsuka, Shigeru Makino Mitsubishi Electric Corporation 5-1-1
More informationLecture 4. Maximum Transfer of Power. The Purpose of Matching. Lecture 4 RF Amplifier Design. Johan Wernehag Electrical and Information Technology
Johan Wernehag, EIT Lecture 4 RF Amplifier Design Johan Wernehag Electrical and Information Technology Design of Matching Networks Various Purposes of Matching Voltage-, Current- and Power Matching Design
More informationCompact Tunable 3 db Hybrid and Rat-Race Couplers with Harmonics Suppression
372 Compact Tunable 3 db Hybrid and Rat-Race Couplers with Harmonics Suppression Khair Al Shamaileh 1, Mohammad Almalkawi 1, Vijay Devabhaktuni 1, and Nihad Dib 2 1 Electrical Engineering and Computer
More informationELECTRICALLY SMALL ANTENNA INSPIRED BY SPIRED SPLIT RING RESONATOR
Progress In Electromagnetics Research Letters, Vol. 7, 47 57, 2009 ELECTRICALLY SMALL ANTENNA INSPIRED BY SPIRED SPLIT RING RESONATOR Z. Duan and S. Qu The College of Science Air Force Engineering University
More informationDesign and Synthesis of Quasi Dual-mode, Elliptic Coaxial Filter
RADIOENGINEERING, VOL. 4, NO. 3, SEPTEMBER 15 795 Design and Synthesis of Quasi Dual-mode, Elliptic Coaxial Filter Sovuthy CHEAB, Peng Wen WONG Dept. of Electrical and Electronic Engineering, University
More informationA Comparative Study of Resonator Based Method To Estimate Permittivity
A Comparative Study of Resonator Based Method To Estimate Permittivity Chanchal Yadav Department of Physics & Electronics Rajdhani College, University of Delhi Delhi, India Abstract In resonator based
More informationElectron Spin Resonance v2.0
Electron Spin Resonance v2.0 Background. This experiment measures the dimensionless g-factor (g s ) of an unpaired electron using the technique of Electron Spin Resonance, also known as Electron Paramagnetic
More informationPUSH-PUSH DIELECTRIC RESONATOR OSCILLATOR USING SUBSTRATE INTEGRATED WAVEGUIDE POW- ER COMBINER
Progress In Electromagnetics Research Letters, Vol. 30, 105 113, 2012 PUSH-PUSH DIELECTRIC RESONATOR OSCILLATOR USING SUBSTRATE INTEGRATED WAVEGUIDE POW- ER COMBINER P. Su *, Z. X. Tang, and B. Zhang School
More informationCOMPACT HALF U-SLOT LOADED SHORTED RECTAN- GULAR PATCH ANTENNA FOR BROADBAND OPERA- TION
Progress In Electromagnetics Research M, Vol. 9, 5 6, 009 COMPACT HALF U-SLOT LOADED SHORTED RECTAN- GULAR PATCH ANTENNA FOR BROADBAND OPERA- TION J. A. Ansari, N. P. Yadav, P. Singh, and A. Mishra Department
More informationDESIGN AND ANALYSIS OF SQUARE SPLIT RING RESONATOR METAMATERIAL FOR MICROWAVE FREQUENCY RANGE
International Journal of Advanced Research in Engineering and Technology (IJARET) Volume 9, Issue 6, November-December 2018, pp. 196 201, Article ID: IJARET_09_06_021 Available online at http://www.iaeme.com/ijaret/issues.asp?jtype=ijaret&vtype=9&itype=6
More informationTransmission Lines. Ranga Rodrigo. January 13, Antennas and Propagation: Transmission Lines 1/46
Transmission Lines Ranga Rodrigo January 13, 2009 Antennas and Propagation: Transmission Lines 1/46 1 Basic Transmission Line Properties 2 Standing Waves Antennas and Propagation: Transmission Lines Outline
More informationH. Arab 1, C. Akyel 2
angle VIRTUAL TRANSMISSION LINE OF CONICAL TYPE COAXIALOPEN-ENDED PROBE FOR DIELECTRIC MEASUREMENT H. Arab 1, C. Akyel 2 ABSTRACT 1,2 Ecole Polytechnique of Montreal, Canada An improved virtually conical
More informationProperties of Inductor and Applications
LABORATORY Experiment 3 Properties of Inductor and Applications 1. Objectives To investigate the properties of inductor for different types of magnetic material To calculate the resonant frequency of a
More informationImpedance Matching of a Loaded Microstrip Transmission Line by Parasitic Elements
Impedance Matching of a Loaded Microstrip Transmission Line by Parasitic Elements H. Matzner 1, S. Ouzan 1, H. Moalem 1, and I. Arie 1 1 HIT Holon Institute of Technology, Department of Communication Engineering,
More informationFlexibility of Contactless Power Transfer using Magnetic Resonance
Flexibility of Contactless Power Transfer using Magnetic Resonance Coupling to Air Gap and Misalignment for EV Takehiro Imura, Toshiyuki Uchida and Yoichi Hori Department of Electrical Engineering, the
More informationPrecise measurement of complex permittivity of materials for telecommunications devices
Paper Precise measurement of complex permittivity of materials for telecommunications devices Takayuki Nakamura and Yoshio Nikawa Abstract In order to obtain precise complex permittivity of the dielectric
More informationA COMPACT RECTENNA DEVICE AT LOW POWER LEVEL
Progress In Electromagnetics Research C, Vol. 16, 137 146, 2010 A COMPACT RECTENNA DEVICE AT LOW POWER LEVEL S. Riviere, F. Alicalapa, A. Douyere, and J. D. Lan Sun Luk Laboratoire LE 2 P Universite de
More informationElectromagnetic Wave Analysis of Waveguide and Shielded Microstripline 1 Srishti Singh 2 Anupma Marwaha
Electromagnetic Wave Analysis of Waveguide and Shielded Microstripline 1 Srishti Singh 2 Anupma Marwaha M.Tech Research Scholar 1, Associate Professor 2 ECE Deptt. SLIET Longowal, Punjab-148106, India
More informationa) Basic unit of an ideal transmission line b) an ideal transmission line
Pulses in cables eferences: H.J. Pain: The Physics of ibrations and Waves, 5 th ed., Wiley, Chapter 7 (Waves in Transmission lines) T.. Kuphaldt: Lessons in Electric Circuits, olume AC, Chapter 4 (Transmission
More informationLab E2: B-field of a Solenoid. In the case that the B-field is uniform and perpendicular to the area, (1) reduces to
E2.1 Lab E2: B-field of a Solenoid In this lab, we will explore the magnetic field created by a solenoid. First, we must review some basic electromagnetic theory. The magnetic flux over some area A is
More informationAC Measurement of Magnetic Susceptibility
AC Measurement of Magnetic Susceptibility Ferromagnetic materials such as iron, cobalt and nickel are made up of microscopic domains in which the magnetization of each domain has a well defined orientation.
More informationA. Kumar and S. Sharma Department of Electronics and Communication Engineering S. D. D. Institute of Engineering and Technology Barwala, India
Progress In Electromagnetics Research, PIER 69, 47 54, 2007 MEASUREMENT OF DIELECTRIC CONSTANT AND LOSS FACTOR OF THE DIELECTRIC MATERIAL AT MICROWAVE FREQUENCIES A. Kumar and S. Sharma Department of Electronics
More informationi. At the start-up of oscillation there is an excess negative resistance (-R)
OSCILLATORS Andrew Dearn * Introduction The designers of monolithic or integrated oscillators usually have the available process dictated to them by overall system requirements such as frequency of operation
More informationDesign and Realization Wilkinson Power Divider at Frequency 2400MHz for Radar S-Band
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) ISSN: 2278-2834, ISBN: 2278-8735. Volume 3, Issue 6 (Nov. - Dec. 2012), PP 26-30 Design and Realization Wilkinson Power Divider at
More informationEquivalent Circuits for Repeater Antennas Used in Wireless Power Transfer via Magnetic Resonance Coupling
Electrical Engineering in Japan, Vol. 183, No. 1, 2013 Translated from Denki Gakkai Ronbunshi, Vol. 131-D, No. 12, December 2011, pp. 1373 1382 Equivalent Circuits for Repeater Antennas Used in Wireless
More informationDepartment of Electrical and Computer Engineering Lab 6: Transformers
ESE Electronics Laboratory A Department of Electrical and Computer Engineering 0 Lab 6: Transformers. Objectives ) Measure the frequency response of the transformer. ) Determine the input impedance of
More informationMaximum Power Transfer versus Efficiency in Mid-Range Wireless Power Transfer Systems
97 Maximum Power Transfer versus Efficiency in Mid-Range Wireless Power Transfer Systems Paulo J. Abatti, Sérgio F. Pichorim, and Caio M. de Miranda Graduate School of Electrical Engineering and Applied
More informationapplication note Philips Magnetic Products Cable Shielding Philips Components
application note Cable Shielding Philips Components Cable Shielding Contents Introduction 3 EMI suppression and cable shielding with ferrites 4 Ferrite selection 6 Material properties 7 Ferrite core and
More informationDesigning VHF Lumped-Element Couplers With MW Office
Designing VHF umped-element Couplers With MW Office Steve Maas, Chief Technology Officer Applied Wave Research, Inc. Copyright (C) 999 Applied Wave Research, Inc.; All Rights Reserved. Abstract This note
More informationCOAXIAL / CIRCULAR HORN ANTENNA FOR A STANDARD
COAXIAL / CIRCULAR HORN ANTENNA FOR 802.11A STANDARD Petr Všetula Doctoral Degree Programme (1), FEEC BUT E-mail: xvsetu00@stud.feec.vutbr.cz Supervised by: Zbyněk Raida E-mail: raida@feec.vutbr.cz Abstract:
More informationT/R Switches, Baluns, and Detuning Elements in MRI RF coils Xiaoyu Yang 1,2, Tsinghua Zheng 1,2 and Hiroyuki Fujita 1,2,3.
T/R Switches, Baluns, and Detuning Elements in MRI RF coils Xiaoyu Yang 1,2, Tsinghua Zheng 1,2 and Hiroyuki Fujita 1,2,3 1 Department of Physics, Case Western Reserve University 2 Department of Radiology,
More informationA Method to Reduce the Back Radiation of the Folded PIFA Antenna with Finite Ground
110 ACES JOURNAL, VOL. 28, NO. 2, FEBRUARY 2013 A Method to Reduce the Back Radiation of the Folded PIFA Antenna with Finite Ground Yan Li, Peng Yang, Feng Yang, and Shiquan He Department of Microwave
More informationCopyright 2004 IEEE. Reprinted from IEEE MTT-S International Microwave Symposium 2004
Copyright 24 IEEE Reprinted from IEEE MTT-S International Microwave Symposium 24 This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement
More informationDesign and Construction of a150kv/300a/1µs Blumlein Pulser
Design and Construction of a150kv/300a/1µs Blumlein Pulser J.O. ROSSI, M. UEDA and J.J. BARROSO Associated Plasma Laboratory National Institute for Space Research Av. dos Astronautas 1758, São José dos
More informationTransmission Lines and TDR
Transmission Lines and TDR Overview This is the procedure for lab 2a. This is a one-week lab. The prelab should be done BEFORE going to the lab session. In this lab, the characteristics of different transmission
More informationA COMPACT DUAL-BAND POWER DIVIDER USING PLANAR ARTIFICIAL TRANSMISSION LINES FOR GSM/DCS APPLICATIONS
Progress In Electromagnetics Research Letters, Vol. 1, 185 191, 29 A COMPACT DUAL-BAND POWER DIVIDER USING PLANAR ARTIFICIAL TRANSMISSION LINES FOR GSM/DCS APPLICATIONS T. Yang, C. Liu, L. Yan, and K.
More informationA 10:1 UNEQUAL GYSEL POWER DIVIDER USING A CAPACITIVE LOADED TRANSMISSION LINE
Progress In Electromagnetics Research Letters, Vol. 32, 1 10, 2012 A 10:1 UNEQUAL GYSEL POWER DIVIDER USING A CAPACITIVE LOADED TRANSMISSION LINE Y. Kim * School of Electronic Engineering, Kumoh National
More informationDesign of Microstrip Coupled Line Bandpass Filter Using Synthesis Technique
Design of Microstrip Coupled Line Bandpass Filter Using Synthesis Technique 1 P.Priyanka, 2 Dr.S.Maheswari, 1 PG Student, 2 Professor, Department of Electronics and Communication Engineering Panimalar
More informationA Low-Loss VHF/UHF Diplexer
A Low-Loss / Diplexer Why use two lengths of expensive feed line when one will do? This hy box lets you use one feed line for both energy, simultaneously! By Pavel Zanek, OK1DNZ Do you need to operate
More informationInductance of solenoids with Cobra3
Inductance of solenoids with Cobra3 TEP Related topics Law of inductance, Lenz s law, self-inductance, solenoids, transformer, oscillatory circuit, resonance, damped oscillation, logarithmic decrement,
More informationImpedance Matching Techniques for Mixers and Detectors. Application Note 963
Impedance Matching Techniques for Mixers and Detectors Application Note 963 Introduction The use of tables for designing impedance matching filters for real loads is well known [1]. Simple complex loads
More informationMAGNETO-DIELECTRIC COMPOSITES WITH FREQUENCY SELECTIVE SURFACE LAYERS
MAGNETO-DIELECTRIC COMPOSITES WITH FREQUENCY SELECTIVE SURFACE LAYERS M. Hawley 1, S. Farhat 1, B. Shanker 2, L. Kempel 2 1 Dept. of Chemical Engineering and Materials Science, Michigan State University;
More informationA 6 : 1 UNEQUAL WILKINSON POWER DIVIDER WITH EBG CPW
Progress In Electromagnetics Research Letters, Vol. 8, 151 159, 2009 A 6 : 1 UNEQUAL WILKINSON POWER DIVIDER WITH EBG CPW C.-P. Chang, C.-C. Su, S.-H. Hung, and Y.-H. Wang Institute of Microelectronics,
More informationImpedance Inverter Z L Z Fig. 3 Operation of impedance inverter. i 1 An equivalent circuit of a two receiver wireless power transfer system is shown i
一般社団法人電子情報通信学会 THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS Impedance Inverter based Analysis of Wireless Power Transfer Consists of Abstract Repeaters via Magnetic Resonant Coupling
More informationK-BAND HARMONIC DIELECTRIC RESONATOR OS- CILLATOR USING PARALLEL FEEDBACK STRUC- TURE
Progress In Electromagnetics Research Letters, Vol. 34, 83 90, 2012 K-BAND HARMONIC DIELECTRIC RESONATOR OS- CILLATOR USING PARALLEL FEEDBACK STRUC- TURE Y. C. Du *, Z. X. Tang, B. Zhang, and P. Su School
More informationRF circuits design Grzegorz Beziuk. RF Amplifier design. References
RF circuits design Grzegorz Beziuk RF Amplifier design References [1] Tietze U., Schenk C., Electronic circuits : handbook for design and applications, Springer 008 [] Pozar D. M., Microwave engineering
More informationSIGNAL TRANSMISSION CHARACTERISTICS IN STRIPLINE-TYPE BEAM POSITION MONITOR
Proceedings of IBIC01, Tsukuba, Japan SIGNAL TRANSISSION CHARACTERISTICS IN STRIPLINE-TYPE BEA POSITION ONITOR T. Suwada, KEK, Tsukuba, Ibaraki 305-0801, Japan Abstract A new stripline-type beam position
More informationMonoconical RF Antenna
Page 1 of 8 RF and Microwave Models : Monoconical RF Antenna Monoconical RF Antenna Introduction Conical antennas are useful for many applications due to their broadband characteristics and relative simplicity.
More informationThe DC Isolated 1:1 Guanella Transmission Line Transformer
The DC Isolated 1:1 Guanella Transmission Line Transformer by Chris Trask / N7ZWY Sonoran Radio Research P.O. Box 25240 Tempe, AZ 85285-5240 Email: christrask@earthlink.net Expanded and Revised 14 August
More informationMode Error Analysis of Impedance Measurement using Twin Wires *
Mode Error Analysis of Impedance Measurement using Twin Wires * Huang Liang-Sheng( 黄良生 ) a,b), Yoshiro Irie( 入江吉郎 ) a,c), Liu Yu-Dong( 刘瑜冬 ) a,b), a,b, #) Wang Sheng( 王生 ) a China Spallation Neutron Source
More informationWireless Signal Feeding for a Flying Object with Strongly Coupled Magnetic Resonance
Wireless Signal Feeding for a Flying Object with Strongly Coupled Magnetic Resonance Mr.Kishor P. Jadhav 1, Mr.Santosh G. Bari 2, Mr.Vishal P. Jagtap 3 Abstrat- Wireless power feeding was examined with
More informationELECTROMAGNETIC COMPATIBILITY HANDBOOK 1. Chapter 8: Cable Modeling
ELECTROMAGNETIC COMPATIBILITY HANDBOOK 1 Chapter 8: Cable Modeling Related to the topic in section 8.14, sometimes when an RF transmitter is connected to an unbalanced antenna fed against earth ground
More informationKeywords Signal Integrity, micro-strip, crosstalk, NEXT, FEXT.
Volume 6, Issue 4, April 2016 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Effect of Vias
More informationUltrawideband Elliptical Microstrip Antenna Using Different Taper Lines for Feeding
Proceedings of the th WSEAS International Conference on COMMUNICATIONS, Agios Nikolaos, Crete Island, Greece, July 6-8, 007 44 Ultrawideband Elliptical Microstrip Antenna Using Different Taper Lines for
More informationnan Small loop antennas APPLICATION NOTE 1. General 2. Loop antenna basics
nan400-03 1. General For F designers developing low-power radio devices for short-range applications, antenna design has become an important issue for the total radio system design. Taking the demand for
More informationCitation Electromagnetics, 2012, v. 32 n. 4, p
Title Low-profile microstrip antenna with bandwidth enhancement for radio frequency identification applications Author(s) Yang, P; He, S; Li, Y; Jiang, L Citation Electromagnetics, 2012, v. 32 n. 4, p.
More informationOptimized Design Method of Microstrip Parallel-Coupled Bandpass Filters with Compensation for Center Frequency Deviation
Progress In Electromagnetics Research Symposium 2005, Hangzhou, China, August 22-26 1 Optimized Design Method of Microstrip Parallel-Coupled Bandpass Filters with Compensation for Center Frequency Deviation
More informationDesign of magnetic field alarm powered by magnetic energy harvesting
Design of magnetic field alarm powered by magnetic energy harvesting Kunihisa Tashiro 1, Azusa Ikegami 1, Syoichiro Shimada 1, Hiroaki Kojima 1, Hiroyuki wakiwaka 1 1 Spin Device Technology Center Shinshu
More informationProgress In Electromagnetics Research, Vol. 113, , 2011
Progress In Electromagnetics Research, Vol. 113, 143 160, 2011 BROADBAND COMPLEX PERMITTIVITY MEASUREMENT OF LOW LOSS MATERIALS OVER LARGE TEMPERATURE RANGES BY STRIPLINE RESONATOR CAVITY USING SEGMENTATION
More informationOPEN SOURCE CABLE MODELS FOR EMI SIMULATIONS
OPEN SOURCE CABLE MODELS FOR EMI SIMULATIONS S. Greedy 1, C. Smartt 1, D. W. P. Thomas 1. 1 : George Green Institute for Electromagnetics Research, Department of Electrical and Electronic Engineering,
More informationTECHNICAL REPORT: CVEL Investigation of the Imbalance Difference Model and its Application to Various Circuit Board and Cable Geometries
TECHNICAL REPORT: CVEL-0-07.0 Investigation of the Imbalance Difference Model and its Application to Various Circuit Board and Cable Geometries Hocheol Kwak and Dr. Todd Hubing Clemson University May.
More informationNOVEL PLANAR MULTIMODE BANDPASS FILTERS WITH RADIAL-LINE STUBS
Progress In Electromagnetics Research, PIER 101, 33 42, 2010 NOVEL PLANAR MULTIMODE BANDPASS FILTERS WITH RADIAL-LINE STUBS L. Zhang, Z.-Y. Yu, and S.-G. Mo Institute of Applied Physics University of Electronic
More informationBroadband analog phase shifter based on multi-stage all-pass networks
This article has been accepted and published on J-STAGE in advance of copyediting. Content is final as presented. IEICE Electronics Express, Vol.* No.*,*-* Broadband analog phase shifter based on multi-stage
More information