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PART ‏تا‎

Answer any two full questions, each carries 15 marks.

Show that the axial electric field of TWT varies with convection current

Explain the constructional features of two hole directional coupler and derive S
matrix

Explain the different methods used for measuring microwave frequency.

Explain how isolators can support only forward direction waves.

What is the significance of slow wave structures used in microwave circuits?
Explain different slow wave structures with neat sketches.

With a schematic describe the operation of a four port circulator. Obtain the
simplified S matrix of a perfectly matched, lossless four port circulator.

PART C

Answer any two full questions, each carries 20 marks.
Explain with block diagram an FM-CW Radar using sideband super heterodyne
receiver
Draw the J-E characteristics of Gunn diode and explain its operation.
What are the main assumptions made in power frequency limitations?
Explain the power frequency limitations of a microwave transistor.
What are low noise front ends? Describe in detail the utility of low noise front ends.
Explain with block diagram the working of MTI Radar with power amplifier and
power oscillator
Draw the energy band diagrams of tunnel diode. Explain the operation of tunnel

diode with the help of I-V characteristics.
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