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PART B

Answer any two full questions, each carries 15 marks.

With neat diagrams explain any two methods to measure impedance at
microwave frequencies.

Explain with figure a two hole directional coupler and derive its S matrix.

With neat diagram explain the operation of a travelling wave tube.

Discuss the constructional features of magic tees and derive its S Matrix. Why
are they called so?

Derive the expression of axial electric field of Helix TWT.

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.
What is tunnelling? Explain the operation of a tunnel diode with aid of energy
band diagram.
Derive Radar range equation.
A simple MTI delay line canceller is an example of time domain filter. Explain
Why?
Discuss the various limitations of microwave transistors.
Explain the more commonly used radar displays.
Explain how the noise figure of a radar receiver is monitored.
Explain with neat diagram, the working of CW radar with non zero IF.

Explain with the help of figures different modes of operation of Gunn diodes.

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