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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh semester B.Tech examinations (S), September 2020

Course Code: EC461
Course Name: MICROWAVE DEVICES ANDCIRCUITS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks

1 a) What are TRAPATT diodes? Explain elaborately their principle of operation (10)
with neat diagram.
b) What are the limitations of conventional solid state devices at microwaves (5)

2 a) Discuss in detail the physical structure of MESFET and explain its principle of (10)

operation.
0) Write a short note on one port negative resistance oscillator (5)
3 ஐ Explain in detail Various modes of operation of Gunn Oscillators (8)
b) Derive the expression for available power gain of microwave amplifier (7)
PART B
Answer any two full questions, each carries 15 marks.
4 a) Explain in detail the concept of matching with lumped elements. (10)
b) Write a short note on ऽ matrix (5)

5 a) Explain the steps in designing a composite filter. Also write down the equations (10)

and draw the circuit for designing a composite low pass filter.

b) Discuss the significance of 1-8 diagram in filter characteristics (5)

6 a) Explain the principle of single stub tuning (7)

b) Design a low pass constant K filter using image parameter method. (8)
PART C

Answer any two full questions, each carries 20 marks.
7 a) Explain the fabrication technique involved in Monolithic Microwave Integrated (10)

circuits.
b) Discuss briefly about slot line. (6)
c) List down the advantages of planar transmission line. (4)

8 a) Classify switches based on characteristics. Explain the basic configuration of (12)

PIN diode switches.

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