Seat No.: ________ Enrolment No.
___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER- VII EXAMINATION-SUMMER 2023
Subject Code: 3171001 Date: 26/06/2023
Subject Name: Microwave Theory and Techniques
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) What is the range of microwave frequency? List down the advantages 03
of microwave.
(b) Show that TEM mode is not possible in rectangular waveguide. 04
(c) Enlist the applications of microwave and explain any one. 07
Q.2 (a) What is the dominant mode in the rectangular waveguide? Which mode 03
is called the dominant mode in the rectangular waveguide? Rectangular
waveguide is which type of filter?
(b) Demonstrate TE10, TE01, TM11 and TE11 modes in rectangular 04
waveguide with necessary indications.
(c) Derive an expression for a TM wave and obtain all the field components 07
in a rectangular waveguide.
OR
(c) Classify various types of strip lines. Explain microstrip lines. 07
Q.3 (a) Which components are used in an equivalent circuit of non – TEM line? 03
Draw the transmission line circuit and explain it in brief.
(b) Differentiate between active and passive microwave components. 04
(c) What is S-parameter? Why it is used at high frequencies? Explain S- 07
parameter in detail with its matrix properties.
OR
Q.3 (a) What is the difference between microwave power divider and 03
microwave power coupler? Enlist and draw various microwave power
dividers and couplers?
(b) Write a brief note on PIN diode 04
(c) Write a short note on Microwave amplifier design. 07
Q.4 (a) Explain IMPATT diode in brief. 03
(b) Explain the effect of microwave on human body. 04
(c) Draw diagram of Magic Tee junction and derive its s-parameter matrix. 07
OR
Q.4 (a) Mention the importance of the impedance matching. 03
(b) Give difference between E-plane Tee and H-plane Tee. 04
(c) Explain two - cavity klystron in detail. 07
Q.5 (a) Write a brief note on antennas for ground based systems. 03
(b) Explain microwave imaging in a brief. 04
(c) Explain medical and civil applications of microwaves. 07
OR
Q.5 (a) Demonstrate the working of directional coupler 03
1
(b) Define the following terms and which parameters are measured by 04
them. 1. Spectrum Analyzer 2. Network Analyzer.
(c) List the various methods for measuring microwave frequencies and 07
explain any one.
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