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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: EC461
Course Name: MICROWAVE DEVICES AND CIRCUITS

PARTA
Answer any two full questions, each carries 15 marks.

What are the limitations of conventional solid state devices at microwave?

Explain modes of operation of Gunn diode

State Gunn effect.

Design a one port negative resistance oscillator.

Design a single stage Transistor Amplifier used in microwave circuits

What is MESFET ? Mention its structure and operation.

An IMPATT diode has carrier drift velocity Va= 3 x 10’ cm/s, Drift region length

L = 6൩. Maximum operating voltage Vomax = 100۷, Maximum operating current

Tomax = 200mA, Efficiency 1 = 15%, Breakdown voltage ‏م۷‎ = 90४. Find

maximum CW output power in watts and the resonant frequency in gigahertz
PART B

Answer any two full questions, each carries 15 marks.

For a microwave circuit , discuss the equivalent voltage and currents .

Derive expressions for S parameters in terms of Z parameters for a 2-port

network.

Explain the principle of double stub matching

What are the steps required to transfer a LPF from HPF .explain.

List the Kuroda’s identity.

Design a low-pass composite filter with a cut-off frequency of 2MHz and

impedances of 75Q. Place the infinite attenuation pole at 2.05MHz.
PART C

Answer any two full questions, each carries 20 marks.
Analyse the hybrid MMICs
Discuss Stripline in planar transmission and also find the Quality factor.

What is Monolithic MICs and Discuss its construction.

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Duration: 3 Hours

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