Reg ‏سنن‎ 00000EC 461121984":
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code: EC461
Course Name: MICROWAVE DEVICES AND CIRCUITS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) With neat diagram explain Two-Valley model theory of Gunn Diode. (10)
b) What are the Characteristics and advantages of microwaves? (5)
2 a) Discuss in detail the term stability with respect to microwave amplifier. (10)
b) Explain the biasing of microwave bipolar transistor. (5)
3 9) Classify the modes of operation of Microwave Bipolar transistor. (8)
b) Derive an expression for power output and efficiency of IMPATT diode. (7)
PART छ

Answer any two full questions, each carries 15 marks.
4 a) Explain the concept of signal flow graph of a two port network. What are the (8)
rules to decompose a signal flow graph?
0) Write a short note on Impedance and Admittance Matrices. (7)
5 a) A five element maximally flat Butterworth low pass filter is to be designed for (10)
use in 50 Q circuit. Its 3 dB point is 500 MHz. Calculate its component value.
b) What are terminated periodic structure? Explain. (5)

6 a) With neat diagrams and relevant equations, explain about the theory of small (8)

reflections.
b) Explain Richard’s Transformation and Kuroda’s identities. (7)
PART ட்‌
Answer any two full questions, each carries 20 marks.
7 ൭) Explain about the materials used in Monolithic MIC. (8)

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