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MICROWAVE TEST BENCH X BAND MWB
Features:
* All components are precious metal plated
* Tested on HP network analyser
1. 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 0-10 V
Current 0-750mA
Modulation Frequency 900-1100Hz
Modulation Amplitude 0-10V
. 2. VSWR meter
It consists of a calibrated high gain tuned amplifier for
measurement of VSWR and relative Power levels. It is
calibrated in VSWR and dB for square law of detector .
Frequency 1KHz
Bandwidth 100Hz
Sensitivity 2uV
3. Gunn Oscillator
A Gunn oscillator generates microwave frequencies
using a Gunn diode. It is supplied with calibration giving
frequency Vs. micrometer reading.
Frequency range X band
Power output 10dBm
4. PIN-diode 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.
Amplitude modulation 50%
Insertion loss 2dB
Technical Specifications
5. 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 a
power level or to isolate a source from a load.
Attenuation 0 to 20dB variable
6. Slotted line with matched Probe
A slotted line is used to measure the amplitude and the
phase of the standing wave pattern to determine the
wavelength, standing wave ratio and the impedance of
the waveguide transmission line. It has built in detector.
Residual SWR 1.1
7. Waveguide matched detector
The detector has a high sensitivity schottky diode
mounted inside a wave guide. It is used for detection
/demodulation of microwave signals.
8. Matched termination
It is non reflective and absorptive termination matched
to the waveguide.
Return Loss >25dB
9. Slide screw tuner precision micrometer type
It is used to match loads, detectors, or antennas to the
characteristic impedance of the waveguide. The
combination of the depth and the position of the probe
causes reflection in the wave guide at a specific
amplitude and phase.
Microwave test bench MWB05
10. Wave guide Stands
They are used to support the microwave components
for setting up waveguide Test bench.
11. Shorting plate
When measuring the wavelength inside of a wave
guide. a shorting plate is used to create a short (zero
impedance) at the open end of a wave-guide.
12. 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 conducting absorber into
a straight portion of a standard waveguide.
Attenuation 3dB
13. Magic-Tee (or Hybrid-Tee)
A magic-Tee 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 magic-Tee is an essential device in balanced
mixers, automatic frequency control circuits and
Impedance measurement circuits.
14. Directional coupler
A directional coupler is consisted 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 30dB
15. Wave guide rigid rectangular straight section.
It is a straight section of wave guide used in
measurements of the wavelength and the phase
velocity inside a wave guide.
16. 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.
17. Pyramidal Horn Antenna
It consists of a section of waveguide joined to a
pyramidal section to concentrate the energy in a beam.
Gain 16dB
18. Reflecting Panel
It is used to reflect electromagnetic waves in free space
when measuring free space wavelength.
Accessories Mains Lead, BNC-BNC lead,
BNC
Technical Specifications
EXPERIMENTS:
1. Introduction to waveguide components.
2. 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.
3. Modulator and crystal detector
i) Operation of PIN diode modulator.
ii) Operation of crystal detector.
iii) Measurement of square law characteristic of crystal
detector.
4. Propagation modes, wavelength and phase velocity in a
waveguide.
i) Measurement of frequency of source.
ii) Measurement of free space & guide wavelength and
verify waveguide law.
5. Q and bandwidth of resonance cavity.
i) Measurement of Q using power meter technique.
ii) Measurement of Q using SWR method.
6. 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.
7. 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.
8. Impedance Measurement
i) Measurement of unknown Impedance of a load using
smith chart.
ii) To match an unknown impedance.
9. Waveguide Hybrid( Magic) Tee
i) Measurement of Power division or Decoupling between
H-arm and 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.
vi) Measurement of VSWR of ports of Hybrid (Magic) Tee
10. 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.
11. 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.
12. To study a cavity resonator type frequency counter.
13. To study wave guide to coax transition.
14. Radiation pattern and Gain
i) To study polar patterns and measure gain for the
pyramidal horn antenna.
19. To establish a Microwave communication link.
Optional : Power Meter MPM18
X Band Signal Generator
DRO 10.5 GHz source

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