MU Microwave Devices & Circuits - May 2013 Exam Question Paper

MU Electronics Engineering (Semester 6)
Microwave Devices & Circuits
May 2013

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) What are the applications of Microwaves?

5 M

1 (b) Can TEM mode exist in hollow waveguide? Justify your answer.

5 M

1 (c) What are O-type and M-type devices in microwave?

5 M

1 (d) Explain the terms: Cut-off frequency, Dominant mode, Phase velocity, Group velocity.

5 M

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

10 M

2 (b) Explain the action of isolator and circulator using ferrites, mention their typical applications.

10 M

3 (a) Draw a neat diagram of two cavity Klystron amplifier and explain the bunching process. Derive the equation of velocity modulation.

10 M

3 (b) An X-band pulsed cylindrical magnetron has the following parameters:
Anode voltage: Vo = 2.6x10⁴V
Beam current: Io=27A
Flux density: Bo=0.336Wb/m²
Radius of cathode cylinder: a=5 cm
Radius of vane edge to centre: b=10 cm
Compute the cyclotron angular frequency
the cut off voltage for a fixed B and
the cut off magnetic flux density for a fixed Vo.

10 M

4 (a) Draw and explain two-hole directional coupler. Define coupling factor, directivity and isolation. Derive S matrix for the same.

10 M

4 (b) Explain Gunn Effect with the two valley model of Gunn diode. What are the criteria that a semiconductor must satisfy in order to exhibit negative resistance?

10 M

5 (a) What are slow wave structures? Explain how helical TWT does amplification.

10 M

5 (b) Describe the types of strip lines in brief.

5 M

5 (c) Explain the excitation of modes in circular waveguides.

5 M

6 (a) Explain the methods used for power measurement in microwaves.

10 M

6 (b) With the help of sketch distinguish between IMPATT and TRAPATT diode.

10 M

Write short notes on any three:-

7 (a) Limitations of conventional tubes at microwave frequencies.

7 M

7 (b) Waveguide attenuators.

7 M

7 (c) Measurement of VSWR.

7 M

7 (d) Microwave transistors.

7 M

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