MU Microwave Devices & Circuits - December 2012 Exam Question Paper

MU Electronics Engineering (Semester 6)
Microwave Devices & Circuits
December 2012

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) List and explain the advantage and disadvantage of microwave along with applications.

5 M

1 (b) Differentiate between TWTA and Klystron.

5 M

1 (c) Why TM₀₁ or TM₁₀ mode is not possible in rectangular waveguide?

5 M

1 (d) Describe the importance of 'S' parameter used in microwave.

5 M

2 (a) Obtain an expression for the modulated velocity of the electron beam in Klystron amplifier in terms of beam coupling coefficient β_i and the average gap transit angle θ_g.

12 M

2 (b) A Reflex Klystron operates at the peak mode of n = 2 having the beam voltage and beam current of 350V and 15mA respectively. If the signal voltage is 45V. Calculate
(i) Input power
(ii) Output power
(iii) Efficiency

8 M

3 (a) Can TEM modes exist in hollow waveguide? Justify your answer.

5 M

3 (b) Derive wave equation for TE wave and obtain all the field components in a rectangular waveguide.

10 M

3 (c) An air-filled rectangular waveguide of inside dimension 7 x 3.5cm operates in the dominant TE₁₀ mode. Find:
(i) Cut-off frequency.
(ii) Phase velocity of the wave at frequency 3.5GHz.
(iii) Guided wavelength at same frequency.

5 M

4 (a) Derive the S-matrix of the E-H plane Tee.

5 M

4 (b) Explain microwave propagation in ferrite devices.

5 M

4 (c) Explain with neat diagram working of Gyrator.

5 M

4 (d) Explain the working of 2-hole directional coupler.

5 M

5 (a) Explain in brief construction, principle and working of two valley model of Gunn oscillator.

10 M

5 (b) How TRAPATT generates Oscillations?

5 M

5 (c) Describe the types of strip lines in details.

5 M

6 (a) What are slow wave structures? Explain any one device that uses slow wave structure in detail.

10 M

6 (b) Measurement of VSWR.

6 M

6 (c) Explain the terms:
Cut-off frequency.
Dominant mode.
Phase velocity.
Wave impedance.

4 M

Write short notes on any four:-

7 (a) Magnetron.

5 M

7 (b) Cavity resonators.

5 M

7 (c) Microwave transistors.

5 M

7 (d) Microwave Passive Devices.

5 M

7 (e) Measurement of Microwave Power.

5 M

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