Dipole Antennas. Prof. Girish Kumar Electrical Engineering Department, IIT Bombay. (022)
|
|
- Constance Sullivan
- 6 years ago
- Views:
Transcription
1 Dipole Antennas Prof. Girish Kumar Electrical Engineering Department, IIT Bombay (022)
2 Infinitesimal Dipole An infinitesimally small current element is called the Hertz Dipole (Length L< λ/50) Assume an infinitesimal current element of length dl carrying an alternating current I o. The instantaneous current is i(t) = I o e jwt i z A = A z z = μ 4π I odl e jkr e jwt z r where, k = 2π λ Dipole and its field components in spherical polar co-ordinate
3 Uniform Current Magnetic Vector Potential
4 E and H Fields from Magnetic Vector Potential
5 Uniform Current E and H Fields
6 Uniform Current Near and Far Fields Near Field Region Near Reactive Field Region Far Field Region Near Radiative Field Region r > where d is the maximum dimension of the antenna
7 Uniform Current - Radiation Pattern Far Field Region (kr>>1) E θ = jη ki ol 4πr sinθ H φ = j ki ol 4πr sinθ E θ H φ = η = 120π R r = 80π 2 l λ 2 Impedance of free-space Directivity D 0 U 4 P max rad 3 2 E-plane radiation pattern E r E φ = H r = H θ = 0 3-D radiation pattern Note : Infinitesimal antenna is not an efficient radiator H-plane radiation pattern
8 Small Dipole Antenna A current element whose length is /50 < l /10 is called small dipole antenna A small dipole Antenna Approximate Triangular Current distribution
9 Small Dipole Radiation Resistance Small dipole current distribution I e x, y, z = a z I l z, 0 z Small dipole vector potential A x, y, z = μ 4π a z l 2 a z I l z, l 2 z 0 + a z 0 l 2 l 2 0 I l z e jkr R I l z e jkr R dz dz Far Field Region (kr>>1) E θ jη ki 0le jkr sinθ 8πr E r E φ = H r = H θ = 0 H φ j ki 0le jkr 8πr sinθ R r = 2P rad I 0 2 = 20π2 l λ For l = λ / 10, R r = 2 Ω l = λ / 4, R r = 12.3 Ω Dipoles also have reactive impedance 2
10 Input Impedance of Transmission Line l Case 1: Z L = 0, Z in = jz 0 tanβl Case 2: Z L =, Z in = Z 0 jtanβl Z 0 Z L Case 3: Z L = Z 0, Z in = Z 0 Where, β = 2π λ if l < λ tanβl = +ve 4 λ 4 < l < λ tanβl = ve 2 Z in For Short-circuit, Z L = 0, Z in is inductive, so T-Line represents inductance Open-circuit, Z L =, Z in is capacitive, so T-Line represents capacitance
11 Half wavelength Dipole Electric and magnetic fields of a half-wavelength dipole Directivity of half-wavelength dipole E θ jη I 0e jkr 2πr H φ j I 0e jkr 2πr cos π 2 cosθ sinθ cos π 2 cosθ sinθ D 0 = 4π U max P rad D = 2.1 db λ/2 Dipole Radiation Resistance R r = 2P rad I Design of Dipole Antenna l + d = 0.48λ, where, d is the diameter of wire and d<λ/10 Note: Input impedance for λ/2 dipole is 73+j42.5Ω. To make imaginary part equal to zero, the antenna length is reduced until the input impedance becomes real. Real Input impedance is < 68Ω.
12 Current Distribution of Dipole Antenna for Different Lengths
13 Radiation Pattern of Dipole Antenna for Different Lengths
14 Dipole Antenna Radiation Pattern for l = 1.25λ Two Dimensional Three Dimensional Directivity is maximum for a thin dipole of length l = 1.25λ
15 Dipole Antenna Resistance and Directivity D 0 = 3.25 R r
16 Flat Dipole Antenna BW for S 11 < 10 db is from 1.39 to 1.54 GHz (150 MHz, 10.2%) Length of each segment = 50 mm Width = 4mm, Gap = 2mm
17 Flat Dipole Antenna Pattern and Directivity Radiation Pattern at 1.5, 3.75 and 4.5 GHz Directivity of 4.8 db is maximum at 3.75 GHz where length of dipole is approx λ
18 Printed Dipole Antenna Length of each segment = 50 mm Width = 4mm, Gap = 2mm FR4 substrate: ε r = 4.4, tanδ = 0.02, h = 1.6mm BW = 1.14 to 1.28 GHz (140 MHz, 11.6%)
19 Broadband Dipole Antenna Bandwidth of dipole antenna is directly proportional to its diameter Cylindrical dipole antenna (can use hollow pipe also) Biconical dipole antenna (can use wire grid also)
20 Balun Design Devices that can be used to balance inherently unbalanced systems by cancelling or choking the outside current, are known as baluns (balance to unbalance). l l Coaxial line λ 4 Metal λ 4 Shorted together Inner conductor of coax Outer conductor of coax λ 4 Coaxial Balun (1:1)- Narrow Bandwidth
21 Balun Design (Contd.) Ferrite core maintains high impedance levels over a wide frequency range. A good design can provide bandwidths of 10 to 1 whereas coil coaxial baluns can provide bandwidths of 2 or 3 to 1. Ferrite core Metal sleeve Z 1 (unbalanced) Z 1 (balanced) Shorted to coax s outer conductor Coaxial line Sleeve or bazooka balun Narrow BW Ferrite core balun Wide BW
22 Microstrip Balun Dipole Antenna for GSM900 Microstrip Balun Dipole Antenna L = 127 mm, w = 4 mm FR4 substrate: ε r = 4.4, tanδ = 0.02, h = 1.6mm BW for S 11 < 10 db is from 881 to 967 MHz (covers GSM900 band of 890 to 960 MHz)
23 Folded Dipole Antenna The impedance of the N fold folded dipole is N 2 times greater than that of an isolated dipole of the same length as one of its side. Impedance for 2-fold dipole antenna is Z in = 2 2 Z r Z in = 4Z r 2-fold dipole antennas are used in Yagi-Uda Antennas for TV reception using balanced line of Z 0 = 300 Ω
24 Dipole Antenna Applications Chip Compact Dipole Antenna for RFID Folded Broadband Dipole Antenna for RF Harvesting (Triangular shape for broadband and multi-fold gave Z in = 750 Ω)
Antennas Prof. Girish Kumar Department of Electrical Engineering Indian Institute of Technology, Bombay. Module 2 Lecture - 10 Dipole Antennas-III
Antennas Prof. Girish Kumar Department of Electrical Engineering Indian Institute of Technology, Bombay Module 2 Lecture - 10 Dipole Antennas-III Hello, and welcome to todays lecture on Dipole Antenna.
More informationLoop and Slot Antennas
Loop and Slot Antennas Prof. Girish Kumar Electrical Engineering Department, IIT Bombay gkumar@ee.iitb.ac.in (022) 2576 7436 Loop Antenna Loop antennas can have circular, rectangular, triangular or any
More informationMonopole Antennas. Prof. Girish Kumar Electrical Engineering Department, IIT Bombay. (022)
Monopole Antennas Prof. Girish Kumar Electrical Engineering Department, IIT Bombay gkumar@ee.iitb.ac.in (022) 2576 7436 Monopole Antenna on Infinite Ground Plane Quarter-wavelength monopole Antenna on
More informationBroadband Microstrip Antennas
Broadband Microstrip Antennas Prof. Girish Kumar Electrical Engineering Department, IIT Bombay gkumar@ee.iitb.ac.in (022) 2576 7436 MSA BW Variation with h and f MSA Broadband Using Multi-Resonators Broad
More informationLinear Wire Antennas. EE-4382/ Antenna Engineering
Linear Wire Antennas EE-438/5306 - Antenna Engineering Outline Introduction Infinitesimal Dipole Small Dipole Finite Length Dipole Half-Wave Dipole Ground Effect Constantine A. Balanis, Antenna Theory:
More informationNotes 21 Introduction to Antennas
ECE 3317 Applied Electromagnetic Waves Prof. David R. Jackson Fall 018 Notes 1 Introduction to Antennas 1 Introduction to Antennas Antennas An antenna is a device that is used to transmit and/or receive
More informationECE Microwave Engineering
ECE 5317-6351 Microwave Engineering Adapted from notes by Prof. Jeffery T. Williams Fall 2018 Prof. David R. Jackson Dept. of ECE Notes 4 Transmission Lines Part 3: Baluns 1 Baluns Baluns are used to connect
More informationAn Introduction to Antennas
May 11, 010 An Introduction to Antennas 1 Outline Antenna definition Main parameters of an antenna Types of antennas Antenna radiation (oynting vector) Radiation pattern Far-field distance, directivity,
More informationANTENNA THEORY. Analysis and Design. CONSTANTINE A. BALANIS Arizona State University. JOHN WILEY & SONS New York Chichester Brisbane Toronto Singapore
ANTENNA THEORY Analysis and Design CONSTANTINE A. BALANIS Arizona State University JOHN WILEY & SONS New York Chichester Brisbane Toronto Singapore Contents Preface xv Chapter 1 Antennas 1 1.1 Introduction
More informationEMG4066:Antennas and Propagation Exp 1:ANTENNAS MMU:FOE. To study the radiation pattern characteristics of various types of antennas.
OBJECTIVES To study the radiation pattern characteristics of various types of antennas. APPARATUS Microwave Source Rotating Antenna Platform Measurement Interface Transmitting Horn Antenna Dipole and Yagi
More informationChapter 6 Broadband Antenna. 1. Loops antenna 2. Heliksantenna 3. Yagi uda antenna
Chapter 6 Broadband Antenna 1. Loops antenna 2. Heliksantenna 3. Yagi uda antenna 1 Design A broadband antenna should have acceptable performance (determined by its pattern, gain and/or feed-point impedance)
More informationECE 4370: Antenna Engineering TEST 1 (Fall 2017)
Name: GTID: ECE 437: Antenna Engineering TEST 1 Fall 17) Please read all instructions before continuing with the test. This is a closed notes, closed book, closed friend, open mind test. On your desk you
More informationLarge Loop Antennas. Special thanks to graduate students of ECSE 593 class, Winter 2007: Yasha Khatamian, Lin Han, Ruiming Chen
Large Loop Antennas Special thanks to graduate students of ECSE 593 class, Winter 2007: Yasha Khatamian, Lin Han, Ruiming Chen McGill University, ECSE 405 Antennas, Fall 2009, Prof. M. Popovic 1. History
More informationHHTEHHH THEORY ANALYSIS AND DESIGN. CONSTANTINE A. BALANIS Arizona State University
HHTEHHH THEORY ANALYSIS AND DESIGN CONSTANTINE A. BALANIS Arizona State University JOHN WILEY & SONS, INC. New York Chichester Brisbane Toronto Singapore Contents Preface V CHAPTER 1 ANTENNAS 1.1 Introduction
More informationJacques Audet VE2AZX. Nov VE2AZX 1
Jacques Audet VE2AZX VE2AZX@amsat.org Nov. 2006 VE2AZX 1 - REASONS FOR USING A BALUN - TYPES OF BALUNS - CHECK YOUR BALUN WITH AN SWR ANALYZER - MEASURING THE IMPEDANCE OF A NUMBER OF FERRITES - IMPEDANCE
More informationARNSW Balun Day. Balun construction
ARNSW Balun Day Balun construction Typical Baluns All built from locally available components. Balun uses Most baluns are used to match the 50Ω output of a transceiver to an antenna. A centre fed dipole
More informationc 2014 Christie M. Bermudez-Rivera
c 2014 Christie M. Bermudez-Rivera AN INVESTIGATION OF SERIES LC RESONANT CIRCUITS WITHIN A SLEEVE BALUN TO ACHIEVE WIDEBAND OPERATION BY CHRISTIE M. BERMUDEZ-RIVERA THESIS Submitted in partial fulfillment
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 informationHalf-Wave Dipole. Radiation Resistance. Antenna Efficiency
Antennas Simple Antennas Isotropic radiator is the simplest antenna mathematically Radiates all the power supplied to it, equally in all directions Theoretical only, can t be built Useful as a reference:
More informationAntenna Engineering Lecture 3: Basic Antenna Parameters
Antenna Engineering Lecture 3: Basic Antenna Parameters ELC 405a Fall 2011 Department of Electronics and Communications Engineering Faculty of Engineering Cairo University 2 Outline 1 Radiation Pattern
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 informationMaster Thesis. Development of a Broadband Circular Polarised Antenna for Over-The Performance Test Applications
Master Thesis Development of a Broadband Circular Polarised Antenna for Over-The The-Air Performance Test Applications Saeed Universität t Duisburg-Essen Hochfrequenztechnik IMST GmbH : Prof. Dr.-Ing.
More informationCHAPTER 5 THEORY AND TYPES OF ANTENNAS. 5.1 Introduction
CHAPTER 5 THEORY AND TYPES OF ANTENNAS 5.1 Introduction Antenna is an integral part of wireless communication systems, considered as an interface between transmission line and free space [16]. Antenna
More informationUNIT Explain the radiation from two-wire. Ans: Radiation from Two wire
UNIT 1 1. Explain the radiation from two-wire. Radiation from Two wire Figure1.1.1 shows a voltage source connected two-wire transmission line which is further connected to an antenna. An electric field
More informationCOAXIAL TRANSMISSION LINE COMMON-MODE CURRENT
COAXIAL TRANSMISSION LINE COMMON-MODE CURRENT Introduction Coaxial transmission lines are popular for their wide frequency bandwidth and high resistance to electromagnetic interference (EMI). Coax cables
More informationIntermediate Course (5) Antennas and Feeders
Intermediate Course (5) Antennas and Feeders 1 System Transmitter 50 Ohms Output Standing Wave Ratio Meter Antenna Matching Unit Feeder Antenna Receiver 2 Feeders Feeder types: Coaxial, Twin Conductors
More informationl s Nikolova Trans. on Antennas and Propagation, vol. AP-28, No. 5, pp , Sept Equation Section 11 1.
LECTURE 11: Practical Dipole/Monopole Geometries. Matching Techniques for Dipole/Monopole Feeds (The folded dipole antenna. Conical skirt monopoles. Sleeve antennas. Turnstile antenna. Impedance matching
More informationMilton Keynes Amateur Radio Society (MKARS)
Milton Keynes Amateur Radio Society (MKARS) Intermediate Licence Course Feeders Antennas Matching (Worksheets 31, 32 & 33) MKARS Intermediate Licence Course - Worksheet 31 32 33 Antennas Feeders Matching
More informationBroadband Antenna. Broadband Antenna. Chapter 4
1 Chapter 4 Learning Outcome At the end of this chapter student should able to: To design and evaluate various antenna to meet application requirements for Loops antenna Helix antenna Yagi Uda antenna
More informationMicrostrip Antennas Integrated with Horn Antennas
53 Microstrip Antennas Integrated with Horn Antennas Girish Kumar *1, K. P. Ray 2 and Amit A. Deshmukh 1 1. Department of Electrical Engineering, I.I.T. Bombay, Powai, Mumbai 400 076, India Phone: 91 22
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 informationAN Far field antenna design. Document information. UCODE EPC G2, G2XM, G2XL, Antenna design
AN 0971 Far field antenna design Rev 1.4 4 March 2008 Application note Document information Info Keywords Abstract Content UCODE EPC G2, G2XM, G2XL, Antenna design This application note provides general
More informationAntenna Theory and Design
Antenna Theory and Design Antenna Theory and Design Associate Professor: WANG Junjun 王珺珺 School of Electronic and Information Engineering, Beihang University F1025, New Main Building wangjunjun@buaa.edu.cn
More informationECEn 665: Antennas and Propagation for Wireless Communications 48. Since the integrand is periodic, we can change the integration limits to
ECEn 665: Antennas and Propagation for Wireless Communications 48 3.3 Loop Antenna An electric dipole antenna radiates an electric field that is aligned with the dipole and a magnetic field that radiates
More informationTheoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure
Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure by Steven Petten A thesis presented to the University of Waterloo in fulfillment of the thesis requirement
More informationPolitecnico di Torino. Porto Institutional Repository
Politecnico di Torino Porto Institutional Repository [Proceeding] Integrated miniaturized antennas for automotive applications Original Citation: Vietti G., Dassano G., Orefice M. (2010). Integrated miniaturized
More informationObjectives of transmission lines
Introduction to Transmission Lines Applications Telephone Cable TV (CATV, or Community Antenna Television) Broadband network High frequency (RF) circuits, e.g., circuit board, RF circuits, etc. Microwave
More informationANTENNA BASICS FOR BEGINNERS
ANTENNA BASICS FOR BEGINNERS PART 2 -DIPOLES DIPOLES -General MULTIBAND DIPOLES RF CHOKES 1 DIPOLES Several different variations of the dipole are also used, such as the folded dipole, short dipole, cage
More informationAntenna Theory EELE 5445
Antenna Theory EELE 5445 Lecture 6: Dipole Antenna Dr. Mohamed Ouda Electrical Engineering Department Islamic University of Gaza 2013 The dipole and the monopole The dipole and the monopole are arguably
More informationDESIGN OF PRINTED YAGI ANTENNA WITH ADDI- TIONAL DRIVEN ELEMENT FOR WLAN APPLICA- TIONS
Progress In Electromagnetics Research C, Vol. 37, 67 81, 013 DESIGN OF PRINTED YAGI ANTENNA WITH ADDI- TIONAL DRIVEN ELEMENT FOR WLAN APPLICA- TIONS Jafar R. Mohammed * Communication Engineering Department,
More informationMaster Thesis. Mobile Phone Antenna Modelling. Umut Bulus. Supervised by Prof. Dr.-Ing. K. Solbach
Master Thesis Mobile Phone Antenna Modelling Umut Bulus Supervised by Prof. Dr.-Ing. K. Solbach 2.3.28 Contents Introduction Theoretical Background Antenna Measurements on Different PCB Variations Investigation
More informationUNIVERSITY OF OKLAHOMA GRADUATE COLLEGE A SIMPLE EM DIPOLE RADIATING ELEMENT FOR DUAL-POLARIZED PHASED ARRAY WEATHER RADARS A THESIS
UNIVERSITY OF OKLAHOMA GRADUATE COLLEGE A SIMPLE EM DIPOLE RADIATING ELEMENT FOR DUAL-POLARIZED PHASED ARRAY WEATHER RADARS A THESIS SUBMITTED TO THE GRADUATE FACULTY in partial fulfillment of the requirements
More informationInvestigation of the Double-Y Balun for Feeding Pulsed Antennas
Proceedings of the SPIE, Vol. 5089, April 2003 Investigation of the Double-Y Balun for Feeding Pulsed Antennas Jaikrishna B. Venkatesan a and Waymond R. Scott, Jr. b Georgia Institute of Technology Atlanta,
More informationDevelopment of a noval Switched Beam Antenna for Communications
Master Thesis Presentation Development of a noval Switched Beam Antenna for Communications By Ashraf Abuelhaija Supervised by Prof. Dr.-Ing. Klaus Solbach Institute of Microwave and RF Technology Department
More informationWhat causes the Out-of-Balance Current in the coax and why does it Radiate?
The EH Antenna - Out of Balance Current or Longitudinal Mode Current in the Coaxial Cable causes radiation from the coax. But how large a proportion of the total power is radiated or lost from this Current?
More informationChapter 4 Impedance Matching
Chapter 4 Impedance Matching Quarter-wave transformer, series section transformer Stub matching, lumped element networks, feed point location 3 Gamma match 4 Delta- and T-match, Baluns -port network Smith
More informationI J E E Volume 5 Number 1 January-June 2013 pp
I J E E Volume 5 Number 1 January-June 2013 pp. 21-25 Serials Publications, ISSN : 0973-7383 Various Antennas and Its Applications in Wireless Domain: A Review Paper P.A. Ambresh 1, P.M. Hadalgi 2 and
More informationFundamentals of Antennas. Prof. Ely Levine
Fundamentals of Antennas Prof. Ely Levine levineel@zahav.net.il 1 Chapter 3 Wire Antennas 2 Types of Antennas 3 Isotropic Antenna Isotropic radiator is the simplest antenna mathematically Radiates all
More informationAntenna Parameters. Ranga Rodrigo. University of Moratuwa. December 15, 2008
Antenna Parameters Ranga Rodrigo University of Moratuwa December 15, 2008 Ranga Rodrigo (University of Moratuwa) Antenna Parameters December 15, 2008 1 / 47 Summary of Last Week s Lecture 90 o Radiation
More informationEC ANTENNA AND WAVE PROPAGATION
EC6602 - ANTENNA AND WAVE PROPAGATION FUNDAMENTALS PART-B QUESTION BANK UNIT 1 1. Define the following parameters w.r.t antenna: i. Radiation resistance. ii. Beam area. iii. Radiation intensity. iv. Directivity.
More informationCray Valley Radio Society. Real Life Wire Antennas
Cray Valley Radio Society Real Life Wire Antennas 1 The basic dipole The size of an antenna is determined by the wavelength of operation In free space: ~3x10 8 m/s Frequency x Wavelength = Speed of Light,
More informationUNIT Write short notes on travelling wave antenna? Ans: Travelling Wave Antenna
UNIT 4 1. Write short notes on travelling wave antenna? Travelling Wave Antenna Travelling wave or non-resonant or aperiodic antennas are those antennas in which there is no reflected wave i.e., standing
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 informationA Broadband Omnidirectional Antenna Array for Base Station
Progress In Electromagnetics Research C, Vol. 54, 95 101, 2014 A Broadband Omnidirectional Antenna Array for Base Station Bo Wang 1, *, Fushun Zhang 1,LiJiang 1, Qichang Li 2, and Jian Ren 1 Abstract A
More informationThe magnetic surface current density is defined in terms of the electric field at an aperture as follows: 2E n (6.1)
Chapter 6. Aperture antennas Antennas where radiation occurs from an open aperture are called aperture antennas. xamples include slot antennas, open-ended waveguides, rectangular and circular horn antennas,
More informationFreescale Semiconductor, I
nc. SEMICONDUCTOR APPLICATION NOTE Order this document by AN1034/D Single RF power transistors seldom satisfy today s design criteria; several devices in separate packages 1, or in the same package (balanced,
More informationMicrowave Patch Antenna with Circular Polarization for Environmental Measurement
Microwave Patch Antenna with Circular Polarization for Environmental Measurement Yumi Takizawa and Atsushi Fukasawa Institute of Statistical Mathematics Research Organization of Information and Systems
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 informationResonant Antennas: Wires and Patches
Resonant Antennas: Wires and Patches Dipole Antennas Antenna 48 Current distribution approximation Un-normalized pattern: and Antenna 49 Radiating power: For half-wave dipole and,, or at exact resonance.
More informationSlot Antennas For Dual And Wideband Operation In Wireless Communication Systems
Slot Antennas For Dual And Wideband Operation In Wireless Communication Systems Abdelnasser A. Eldek, Cuthbert M. Allen, Atef Z. Elsherbeni, Charles E. Smith and Kai-Fong Lee Department of Electrical Engineering,
More informationChapter 7 Design of the UWB Fractal Antenna
Chapter 7 Design of the UWB Fractal Antenna 7.1 Introduction F ractal antennas are recognized as a good option to obtain miniaturization and multiband characteristics. These characteristics are achieved
More informationTraveling Wave Antennas
Traveling Wave Antennas Antennas with open-ended wires where the current must go to zero (dipoles, monopoles, etc.) can be characterized as standing wave antennas or resonant antennas. The current on these
More informationR. Zhang, G. Fu, Z.-Y. Zhang, and Q.-X. Wang Key Laboratory of Antennas and Microwave Technology Xidian University, Xi an, Shaanxi , China
Progress In Electromagnetics Research Letters, Vol. 2, 137 145, 211 A WIDEBAND PLANAR DIPOLE ANTENNA WITH PARASITIC PATCHES R. Zhang, G. Fu, Z.-Y. Zhang, and Q.-X. Wang Key Laboratory of Antennas and Microwave
More informationFourth Year Antenna Lab
Fourth Year Antenna Lab Name : Student ID#: Contents 1 Wire Antennas 1 1.1 Objectives................................................. 1 1.2 Equipments................................................ 1
More informationWelcome to AntennaSelect Volume 1 August 2013
Welcome to AntennaSelect Volume 1 August 2013 This is the first issue of our new periodic newsletter, AntennaSelect. AntennaSelect will feature informative articles about antennas and antenna technology,
More informationAntenna Arrays. EE-4382/ Antenna Engineering
Antenna Arrays EE-4382/5306 - Antenna Engineering Outline Introduction Two Element Array Rectangular-to-Polar Graphical Solution N-Element Linear Array: Uniform Spacing and Amplitude Theory of N-Element
More informationOn the Design of Slot Cut Circularly Polarized Circular Microstrip Antennas
Wireless Engineering and Technology, 2016, 7, 46-57 Published Online January 2016 in SciRes. http://www.scirp.org/journal/wet http://dx.doi.org/10.4236/wet.2016.71005 On the Design of Slot Cut Circularly
More informationMiniaturization of Multiple-Layer Folded Patch Antennas
Miniaturization of Multiple-Layer Folded Patch Antennas Jiaying Zhang # and Olav Breinbjerg #2 # Department of Electrical Engineering, Electromagnetic Systems, Technical University of Denmark Ørsted Plads,
More informationRange Considerations for RF Networks
TI Technology Days 2010 Range Considerations for RF Networks Richard Wallace Abstract The antenna can be one of the most daunting components of wireless designs. Most information available relates to large
More informationECE 4370: Antenna Engineering TEST 1 (Fall 2011)
Name: GTID: ECE 4370: Antenna Engineering TEST 1 (Fall 2011) Please read all instructions before continuing with the test. This is a closed notes, closed book, closed friend, open mind test. On your desk
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 informationCREATING THREE DUAL ISOSCELES TRIANGULAR SLOTS ON THE PATCH AND BANDWIDTH ENHANCEMENT FOR SLOTTED METAMATERIAL MICROSTRIP PATCH ANTENNA
CREATING THREE DUAL ISOSCELES TRIANGULAR SLOTS ON THE PATCH AND BANDWIDTH ENHANCEMENT FOR SLOTTED METAMATERIAL MICROSTRIP PATCH ANTENNA BUDIPUTI ANITHA PRAVALLI, M. Tech, ASSISTANT PROFESSOR SRK INSTITUTE
More informationCHAPTER 4 EFFECT OF DIELECTRIC COVERS ON THE PERFORMANCES OF MICROSTRIP ANTENNAS 4.1. INTRODUCTION
CHAPTER 4 EFFECT OF DIELECTRIC COVERS ON THE PERFORMANCES OF MICROSTRIP ANTENNAS 4.1. INTRODUCTION In the previous chapter we have described effect of dielectric thickness on antenna performances. As mentioned
More informationCircular Polarization Array Antenna with Orthogonal Arrangement and Parallel Feeding by Smoothed Routing Wires
Circular Polarization Array Antenna with Orthogonal Arrangement and Parallel Feeding by Smoothed Routing Wires Yumi Takizawa and Atsushi Fukasawa Institute of Statistical Mathematics Research Organization
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 informationPrinted Circuit Board Dipole Antennas and Dipole Antenna Array Operating at 1.8GHz
Declaration I declare that this thesis is my own unaided work, and hereby certify that unless stated, all work contained within this paper is my own to the best of my knowledge. This thesis is being submitted
More informationSLOT LOADED SHORTED GAP COUPLED BROADBAND MICROSTRIP ANTENNA
SLOT LOADED SHORTED GAP COUPLED BROADBAND MICROSTRIP ANTENNA SARTHAK SINGHAL Department of Electronics Engineering,IIT(BHU),Varanasi Abstract- In this paper the bandwidth of a conventional rectangular
More informationTravelling Wave, Broadband, and Frequency Independent Antennas. EE-4382/ Antenna Engineering
Travelling Wave, Broadband, and Frequency Independent Antennas EE-4382/5306 - Antenna Engineering Outline Traveling Wave Antennas Introduction Traveling Wave Antennas: Long Wire, V Antenna, Rhombic Antenna
More informationModeling of a Patch- Antenna
Master Thesis Modeling of a Patch- Antenna by Yingbin Wu Supervised by Prof. Dr. -Ing. K. Solbach 24.05.2007 Content Introduction Modeling of disk-loaded monopoles Modeling of a Patch-Antenna Conclusion
More informationA LABORATORY COURSE ON ANTENNA MEASUREMENT
A LABORATORY COURSE ON ANTENNA MEASUREMENT Samuel Parker Raytheon Systems Company, 2000 East Imperial Highway RE/R02/V509, El Segundo, CA 90245 Dean Arakaki Electrical Engineering Department, California
More informationCHAPTER 8 ANTENNAS 1
CHAPTER 8 ANTENNAS 1 2 Antennas A good antenna works A bad antenna is a waste of time & money Antenna systems can be very inexpensive and simple They can also be very expensive 3 Antenna Considerations
More informationMiscellaneous Topics. Folded dipole antenna Special antennas. Other antennas Feed Lines. Yagi-Uda antenna Broadband antenna Log-periodic antenna
Folded dipole antenna Special antennas Yagi-Uda antenna Broadband antenna Log-periodic antenna Other antennas Feed Lines Miscellaneous Topics 1 Folded Dipole Half-wavelength dipoles have impedance 73+j42.5
More informationInset Fed Microstrip Patch Antenna for X-Band Applications
Inset Fed Microstrip Patch Antenna for X-Band Applications Pradeep H S Dept.of ECE, Siddaganga Institute of Technology, Tumakuru, Karnataka. Abstract Microstrip antennas play an important role in RF Communication.
More informationCOUPLED SECTORIAL LOOP ANTENNA (CSLA) FOR ULTRA-WIDEBAND APPLICATIONS *
COUPLED SECTORIAL LOOP ANTENNA (CSLA) FOR ULTRA-WIDEBAND APPLICATIONS * Nader Behdad, and Kamal Sarabandi Department of Electrical Engineering and Computer Science University of Michigan, Ann Arbor, MI,
More informationCompact Wide-Beam Circularly Polarized Antenna with Stepped Arc-Shaped Arms for CNSS Application
Progress In Electromagnetics Research C, Vol. 71, 141 148, 2017 Compact Wide-Beam Circularly Polarized Antenna with Stepped Arc-Shaped Arms for CNSS Application Can Wang *, Fushun Zhang, Fan Zhang, Yali
More informationAntenna Theory and Design
Antenna Theory and Design Antenna Theory and Design Associate Professor: WANG Junjun 王珺珺 School of Electronic and Information Engineering, Beihang University wangjunjun@buaa.edu.cn 13426405497 Chapter
More informationWhat does reciprocity mean
Antennas Definition of antenna: A device for converting electromagnetic radiation in space into electrical currents in conductors or vice-versa. Radio telescopes are antennas Reciprocity says we can treat
More informationImpedance and Loop Antennas
Impedance and Loop Antennas Ranga Rodrigo University of Moratuwa January 4, 2009 Ranga Rodrigo (University of Moratuwa) Impedance and Loop Antennas January 4, 2009 1 / 41 Gain Summary of Last Week s Lecture
More informationInvestigation of Board-Mounted Omni- Directional Antennas for WLAN- Applications
Investigation of Board-Mounted Omni- Directional Antennas for WLAN- Applications Luis Quineche ISE Master Student EEE: Communications Engineering Index Description of Problem Thesis Task Background Theory
More informationAntennas & wave Propagation ASSIGNMENT-I
Shri Vishnu Engineering College for Women :: Bhimavaram Department of Electronics & Communication Engineering Antennas & wave Propagation 1. Define the terms: i. Antenna Aperture ii. Beam Width iii. Aperture
More informationChapter 12: Transmission Lines. EET-223: RF Communication Circuits Walter Lara
Chapter 12: Transmission Lines EET-223: RF Communication Circuits Walter Lara Introduction A transmission line can be defined as the conductive connections between system elements that carry signal power.
More informationperformed on isolated environments without the effect of the surrounding structures. Study of the actual antennas interaction with the actual
NTRODUCTION Wireless communications, nowadays, depend on antenna as an essential component. Without the antenna, it would be virtually impossible to have any form of wireless communication. Instead, the
More informationUNIVERSITI MALAYSIA PERLIS
UNIVERSITI MALAYSIA PERLIS SCHOOL OF COMPUTER & COMMUNICATIONS ENGINEERING EKT 341 LABORATORY MODULE LAB 2 Antenna Characteristic 1 Measurement of Radiation Pattern, Gain, VSWR, input impedance and reflection
More informationA Wideband Dual-polarized Modified Bowtie Antenna for 2G/3G/LTE Base-station Applications
Progress In Electromagnetics Research Letters, Vol. 61, 131 137, 2016 A Wideband Dual-polarized Modified Bowtie Antenna for 2G/3G/LTE Base-station Applications Zhao Yang *, Cilei Zhang, Yingzeng Yin, and
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 informationAntenna Theory. Wire Antennas
Antenna Theory Wire Antennas Monopole Antenna Long Wire or Traveling wave Antennas Yagi Uda Antenna Prof. D. Kannadassan Reference: C. A. Balanis, J.D. Krauss Monopole antenna Image theory, an intro A
More informationCOMPACT SHORTED MICROSTRIP PATCH ANTENNA FOR DUAL BAND OPERATION
Progress In Electromagnetics Research C, Vol. 9, 171 182, 2009 COMPACT SHORTED MICROSTRIP PATCH ANTENNA FOR DUAL BAND OPERATION A. Mishra, P. Singh, N. P. Yadav, and J. A. Ansari Department of Electronics
More informationWHY YOU NEED A CURRENT BALUN
HF OPERATORS WHY YOU NEED A CURRENT BALUN by John White VA7JW NSARC HF Operators 1 What is a Balun? A BALUN is a device typically inserted at the feed point of a dipole-like antenna wire dipoles, Yagi
More informationANTENNA THEORY ANALYSIS AND DESIGN
ANTENNA THEORY ANALYSIS AND DESIGN THIRD EDITION Constantine A. Balanis WILEY- INTERSCIENCE A JOHN WILEY & SONS. INC.. PUBLICATION ial iel pi ial ial ial IBl ial ial ial pi Sl Contents Preface Xlll 1 Antennas
More informationDESIGN AND ENHANCEMENT BANDWIDTH RECTANGULAR PATCH ANTENNA USING SINGLE TRAPEZOIDAL SLOT TECHNIQUE
DESIGN AND ENHANCEMENT BANDWIDTH RECTANGULAR PATCH ANTENNA USING SINGLE TRAPEZOIDAL SLOT TECHNIQUE Karim A. Hamad Department of Electronics and Communications, College of Engineering, Al- Nahrain University,
More information