MICROWAVE MICROWAVE TRAINING BENCH COMPONENT SPECIFICATIONS:
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1 Microwave section consists of Basic Microwave Training Bench, Advance Microwave Training Bench and Microwave Communication Training System. Microwave Training System is used to study all the concepts of microwave transmission, various components used for microwave communication and their parameters. These Systems are introduced to create an awareness of the higherend technologies used in modern day communication. These are table top benches using standard WR90 waveguide components for study of Microwave communication and measurements. Microwave training benches and components are designed to work on the Xband frequency range. An exhaustive manual is provided along with the system, which provides detailed experimental procedure and complete explanation of the system. All the components are tested on 20 GHz HP Network analyzer for unparalleled performance. MTB01 is a basic microwave bench used to teach basic fundamentals of microwave components and their properties. This model is recommended for training of students at technician level. MTB02 is an enhanced model of basic microwave bench which covers various applications and some communication techniques, in addition to basic fundamentals of microwave components and their properties. This model is recommended for the training of students at polytechnics and diploma levels. MTB03 is a microwave communication training system which covers not only the basic fundamentals of microwave components and their properties but also teaches various aspects of microwave technology in the field of telecommunication. This model is designed considering the requirement of university curriculum and training needs. MICROWAVE TRAINING BENCH COMPONENT SPECIFICATIONS: Digital Gunn Power supply: It consists of a regulated DC power supply and a square wave generator, to operate Gunn oscillator and PIN modulator. Gunn bias voltage : 010 V Current : 0750mA Modulation frequency : Hz Modulation amplitude : 010V VSWR meter: It consists of a low noise calibrated high gain tuned amplifier for measurement of VSWR and relative power levels. It is calibrated in VSWR and db. Frequency : 1KHz Bandwidth : 100Hz Range : 70dB Gunn Oscillator: A Gunn oscillator generates microwave frequencies. Gunn oscillator is supplied with calibration giving frequency vs. micrometer reading. Frequency range : X band Power output : 10mW typical PINdiode modulator: PIN diode modulator produces amplitude modulation of the CW output of Gunn oscillator for detection by VSWR meter. It consists of a PIN diode mounted inside a section of waveguide. Flange : UG39/U Waveguide : WR90 Frequency Meter: It consists of a variable sized resonant cavity with a calibrated dial coupled to a waveguide. The actual frequency is obtained by reading the calibrated dial at power drop. Frequency Range : GHz Resolution : 5 MHz typical Variable Attenuator: A variable attenuator provides attenuation by varying the degree of insertion of a matched resistive strip into a wave guide. The Variable Attenuator is used to control power level or to isolate a source from a load. Attenuation : 0 to 20dB variable Slotted line with matched Probe: A slotted line is used to probe the amplitude and the phase of the standing wave pattern to determine the wavelength, standing wave ratio and the impedance of the transmission line. Waveguide matched detector: Crystal detector has a microwave schottky diode mounted inside a wave 51
2 guide. It is used for detection of microwave signals. Matched terminator: It is non reflective and absorptive termination matched to the microwave waveguide. Slide screw tuner precision micrometer type: It is used to match loads, detectors, or antennas to the characteristic impedance of the wave guide. The combination of depth and position of the probe causes reflection in the wave guide at a specific amplitude and phase. Wave guide stands: They are used to support the microwave components for setting up waveguide Test bench. Shorting plate: When measuring the wavelength inside a wave guide, a shorting plate is used to create a short (zero impedance) at the open end of a waveguide. Fixed Attenuator: The purpose of the fixed attenuator is to provide a fixed Attenuation, Isolation, Padding etc. The Attenuation is obtained by insertion of a thin absorber into a straight portion of a standard waveguide. Attenuation :10/20dB MagicTee (or HybridTee): A magictee is a four port device where power incident on any arm splits equally between the two adjacent arms, but there is no power coupled to the opposite arm. The magictee is an essential device in balanced mixers, automatic frequency control circuits and Impedance measurement circuits. Directional Coupler: A Directional Coupler consists of two wave guides combined together and coupled by holes at the joining section. It is used to measure the VSWR or return loss of components. Coupling : 10dB Directivity : 35dB Wave guide rigid rectangular straight section: It is a straight section of wave guide used in the measurements of the wavelength and the phase velocity inside a wave guide. Wave guide to Coaxial Adapter: It provides a transition between a wave guide and a 50 ohm coaxial cable. It has low SWR with flat frequency response and low loss. Pyramidal Horn Antenna: It consists of a section of waveguide joined to a pyramidal section to concentrate the energy in a beam. Solid Dielectric cell: It consists of a waveguide section with polished fixed reflector for measurement of dielectric constant. Solid Dielectric: Different lengths of several solid dielectric material is provided for study. Liquid Dielectric cell: It is used to measure the dielectric constant of low loss liquids. Waveguide Phase Shifter: It consists of a low loss vane inserted in a waveguide to introduce variable phase shift. Cross Directional coupler: It consists of two sections of waveguides, joined together at right angles with coupling provided by star shaped slots in broad wall. Three Port T Circulator: It is a matched ferrite based, three port device, which allows power to flow only in clockwise direction. It can be used to connect an antenna to a Transmitter and Receiver simultaneously. Isolator: It is a matched ferrite based, two port device, allowing low forward insertion loss and high reverse isolation. EPlane Tee: It provides a series type Tjunction for division of power in same magnitude but opposite phases. HPlane Tee: It provides a shunt type Tjunction for use with detector devices. It divides power in same magnitude and phase. EPlane Bend: It provides a 90 degree bend in H plane in a waveguide. HPlane Bend: It provides a 90 degree bend in E plane in a waveguide. Pyramidal wave guide horn antenna: It consists of a section of waveguide joined to a pyramidal section to concentrate the energy in a beam. Narrow walled wave guide slot antenna: This antenna has an angled radiating slot on the narrow wall of the waveguide. Broad walled wave guide slot antenna: This antenna has a radiating slot on the broader wall of waveguide. Eplane wave guide horn antenna: It is a horn antenna with Eplane flare and constant Hplane width. H plane wave guide horn antenna: It is a horn antenna with H plane flare and constant Eplane width. Conical horn antenna with probe feed: It is a horn antenna made to the shape of a cone with exponential taper for good directional properties. Parabolic dish antenna with patch feed: It is a parabolic reflecting dish with patch antenna feed for high gain. Microstrip Patch antenna : These are microstrip fed patch antenna in single, double, 4 and 16 element array. Reflector panel: It is used to reflect electromagnetic waves in free space when measuring free space wavelength. Antenna rotator: It is a manually rotating antenna stand with angle measurement facility. Coaxial cable NN 18 Ghz: Low loss microwave cable for study of coaxial transmission. 52
3 LIST OF EXPERIMENTS MTB01 MTB02 MTB03 Introduction to microwave waveguide components. Gunn Oscillator i) Measurement of current vs. voltage characteristic of Gunn diode. ii) Measurement of Gunn Oscillator output power and supply voltage. iii) Measurement of Gunn Oscillator output frequency and supply Voltage. Modulator and Crystal Detector i) Operation of PIN Diode modulator. ii) Operation of Crystal Detector. iii) Measurement of square law characteristic of Crystal Detector. Propagation modes, Wavelength and Phase Velocity in a waveguide. i) Measurement of frequency of source. ii) Measurement of free space wavelength and Guide Wavelength and Verify waveguide law. Q and Bandwidth of resonance cavity. i) Measurement of Q using power measurement technique. ii) Measurement of Q using SWR method. Power Measurement i) Direct power measurement ii) Measurement of power using Directional Coupler. iii) Measurement of conjugate and Zo power. iv) Measurement of power of modulated signal. VSWR and reflection coefficient by Standing wave and Double Minimum Method i) Measurement of low and medium range SWR. ii) Measurement of high range SWR. iii) Measurement of high range SWR using a calibrated attenuator. Impedance Measurement i) Measurement of unknown Impedance of a load using smith chart. ii) To match an unknown impedance. Waveguide Eplane, Hplane and Hybrid( Magic) Tee i) Measurement of power division / decoupling between Harm & E arm of a Magic Tee. ii) Measurement of insertion loss of a Magic Tee. iii) Measurement of return loss of H arm of a Magic Tee. iv) Measurement of power division of an E and H plane Tee. v) Measurement of insertion loss of an E and H plane Tee. vi) Measurement of VSWR of ports of Eplane, Hplane and Hybrid (Magic) Tee Properties of Directional Coupler i) Measurement of coupling factor. ii) Measurement of directivity. iii) Measurement of return loss of a load. iv) Measurement of Main line insertion loss. v) Measurement of VSWR of ports. Fixed and Variable Attenuator i) Measurement of attenuation using the power ratio method. ii) Measurement of attenuation using the RF substitution method. iii) Measurement of low values of attenuation. iv) Measurement of VSWR and insertion Loss. v) Measurement of insertion loss of attenuator. To study a cavity resonator type frequency counter. To study wave guide to coax transition. To measure dielectric constant of Solids. 53
4 LIST OF EXPERIMENTS MTB01 MTB02 MTB03 To measure dielectric constant of Liquids. To measure phase shift of a phase shifter. Isolators & Circulators i) To study insertion loss of isolators. ii) To study isolation of isolators. iii) To study insertion loss of circulators. iv) To study isolation of circulators. v) To study VSWR of circulator and Isolator. Radiation pattern and Gain i) To study polar patterns and measure gain for the pyramidal horn antenna. ii) To study polar patterns and measure gain for the narrow wall slot antenna. ii) To study polar patterns and measure gain for the broad wall slot antenna. iv) To study polar patterns and measure gain for the E plane horn antenna. v) To study polar patterns and measure gain for the H plane horn antenna. vi) To study polar patterns and measure gain for the parabolic dish antenna. To establish a Microwave communication link. To study Coaxial Transmission lines at microwave frequencies. 54
5 LIST OF COMPONENTS MTB01 MTB02 MTB03 Digital Gunn power supply Gunn oscillator VSWR meter PIN modulator Direct reading frequency meter Variable attenuator Slotted line with matched probe Waveguide matched detector Matched termination Tunable waveguide detector Movable precision short Slide screw tuner precision micrometer type Wave guide stands Shorting plate Fixed attenuator 3, 6, 10dB Magic Tee Multihole Directional Coupler Wave guide rigid rectangular Waveguide coax adapter Solid & Liquid Dielectric cell Solid Dielectric of teflon, nylon, Acrylic 10, 20, 30mm lengths each Waveguide phase shifter Cross Directional coupler Three port T circulator Isolator E & H Plane Tee E & H Plane bend Conical horn antenna with probe feed Parabolic dish antenna with patch feed Microstrip Patch antenna single, double, four, 16 elements Iris Inductive & Capacitive Reflector panel Coaxial cable NN 18 GHz BNC to BNC cable Smith chart 100 pages Antenna rotator Packing case Experimental Manual 4pc 1set 1no 4pc 3pc 9each 1set 1no 4pc 3pc 9each 1set 1no OPTIONAL: Antenna turntable stepper motor Stepper motor controller DRO X band Oscillator with 1mW output with Power Supply with internal 1Hz10KHz Sq. Wave amplitude modulation and ext. TTL data input Digital Power meter with 1MHz to 18 Ghz sensor Digital Klystron Power supply Klystron Mount with tube 55
6 MPM05 MICROWAVE RF POWER METER WITH SENSOR Model MPM05 is a low cost, highperformance CW power meter using a microwave power sensor. This power meter can measure power levels from 30dBm to +20dBm and cover frequencies from 1MHz to 18GHz. MPM05 is designed with bench and field service applications in mind and can also be used for swept measurement. FEATURES: 1MHz to 18GHz measurement range. Simple software user interface. RS 232 interface. Bar Graph Display. Excellent measurement speed at all power levels. Auto zero and db relative mode. Built in 50 MHz, 0dBm reference oscillator. Voltage vs db output port for swept scalar measurement system. SPECIFICATIONS: POWER METER: Frequency range : 1MHz to 18 GHz Power range : 30dBm to +20dBm Power Measurement : dbm, dbr, mw, with Bar Graph Display. Ranging : Autoranging Measurement speed : 10 readings per second Display Offset : db Offset for Relative measurement Resolution : 0.1 db Power reference : 50MHz, 0dBm +/ 0.1dBm Calibration factor : +3dB to 3dB in 0.1dB steps Filtering : 100ms to 10s Sensor zero : Auto zero Display : 16X2 Backlit LCD Log output : 0.1 volts/db, for use with sweeper as scalar network analyzer PC interface : RS232 serial port Power requirement : 230V +/ 10% AC POWER SENSOR : RF Input Connector : Nmale Frequency range : 1MHz to 18GHz Maximum input : 20dB upto 12.4GHz 15dB upto 18GHz Impedance : 50 Ohms Cable : Sensor/meter cable 3m Adapter : NSMA, NBNC, Xband waveguide to coax adapter 56
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