Microwave Laboratory


  • Equipment:
    • Agilent PNA-L Network Analyzer N5230A (10 MHz to 50 GHz)
    • Agilent ENA Series Network Analyzer E5062A (300 KHz to 3 GHz)
    • Agilent Network Analyzer 8714ET (300 KHz to 3000 MHz)
    • Agilent Spectrum Analyzer N9320B (9 KHz to 3GHz)
    • Rohde and Schwarz Spectrum Analyzer FS300 (9 KHz to 3GHz)
    • Agilent PSG analog signal generator E8257D 250 KHz to 20 GHz
    • Agilent RF Signal Generator N9310A (9 KHz to 3GHz)
    • WaveTek Microwave Source Model-952 (1 GHz to 4 GHz)
    • WaveTek Microwave Source Model-954 (3.7 GHz to 7.6 GHz)
    • WaveTek Microwave Source Model-955 (7.5 GHz to 12.4 GHz)
    • HP Signal Generator 8656B (0.1 MHz to 990 MHz)
    • Agilent Function/Arbitrary Waveform Generator 33250A 80 MHz
    • HP Power Meter 437B
    • HP Power Sensor 8481A
    • HP Noise Figure Meter 8970B
    • Agilent RF Amplifier 83006A, 0.01-26.5 GHz, 20 dB gain
    • Agilent Calibration kit 85056D 2.4 mm
    • Agilent Calibration kit 85032F Type-N
    • Agilent Calibration kit 85033D 3.5 mm
  • Shielded Anechoic Chamber:
    • A Radio frequency (RF) anechoic chamber is a closed RF echo free space that simulates infinite free space condition inside a room. It is constructed by covering the inner walls of the room by RF absorbers made of carbon impregnated foam shaped in the form of pyramids (Fig. 1). The size of the pyramids and the carbon composition determines the lowest frequency that can be effectively absorbed. Larger sized cones are capable of absorbing lower frequency waves.
    • Anechoic chamber are used for measurement of antenna radiation pattern, electromagnetic compatibility, radar cross section, etc. Apart from creating a reflection free environment, an anechoic chamber should also suppress the unwanted signals penetrating into the chamber and interfering with the measurements. This is achieved by first lining the walls of the chamber by high permeability metal sheets and then with the RF absorber material. The metal cage is grounded using a specially prepared low conductivity earth pit connection to provide a zero potential cage. The metal cage shields the measurement space from external interferences.
    • The chamber dimension are 7 m x 6 m x 3.3 m (LxWxH). It can be used for conducting measurements at frequencies from 1 GHz to 26 GHz. The quiet zone is 2m x 0.8 m x 0.8 m (WxHxL) at 1 GHz, and 2m x 0.3 m x 0.3 m (WxHxL) between 10 GHz and 26 GHz centered at a distance of about 4 m from the transmitting antenna. The shielded effectiveness is -50 dB at 1 GHz and – 40 dB from 2 to 18 GHz.

  • Microwave Measurement and Design
  • Characterization of Microwave devices and circuits

List of Experiments:
  • VSWR Measurement and Impedance Calculation
    Measure the VSWR using normal method and double minima method
    Measure the frequency using the frequency meter and compare with calculated guided wavelength
    Calculate the input impedance of a given load from the VSWR measurements and shift in the minima
  • Study of Tuners and Impedance Matching using single, double and E-H tuners
    Measure the post reactance as a function of the depth of the post
    Impedance matching of a given load using slide screw tuner, E-H Tuner, Double stub tuner
  • To study the behavior of terminated coaxial transmission line in both frequency and time domains.
  • Familiarization with basic operation of Vector Network Analyzer (VNA)
    Study the operation of VNA and understand the use of menus/soft keys
    Study the method of setting reference and introducing offset to obtain accurate readings
    Use the VNA to measure the complete S parameters of the component under test
  • Calibration and measurement with Vector Network Analyzer
    Performing the 2-port calibration on the coaxial media
    Characterization of the directional coupler, filter, attenuator etc.
  • Understanding of Power Meter and calibration of variable attenuator
    Understand the use of power meter
    Calibration of variable attenuator
    Determination of detector characteristics
  • Directional Coupler Characteristics and application to Scalar Network Analyzer
    Measure the characteristics of a directional coupler like coupling, isolation and directivity
    Use the directional coupler to set up a scalar network analyzer and measure the scattering matrix of a two-port device
  • Familiarization with the Noise Figure Meter and Measurement of Noise Figure of different devices
    Familiarization with the Noise Figure Meter
    Measurement of Noise Figure of different devices
  • Study of Spectrum Analyzer Measurement
    Familiarization with the Spectrum Analyzer.
    Study of the spectra of modulated waveforms
    Measure the 1 dB compression point of the amplifier and the harmonics produced.
    Gain flatness
    Use the tracking generator as a scalar analyzer
  • Measure the radiation pattern and gain of the antenna
    Measure the radiation pattern of the antenna under test
    Measure the gain of the antenna using absolute gain measurement and gain comparison method

Contact Person:
Dr. Kumar Vaibhav Srivastava
Email: kvs@iitk.ac.in
Phone: 91-512-259-7105
Location: ACES-225