GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020
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Subject Code:2161003 Date:22/01/2021Subject Name:Antenna & Wave Propagation
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) What are the functions of antenna? 03
(b) Define: (1) Directivity (2) Resolution 04
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(3) Beam Area (4) Radiation Pattern(c) Write a short note on types of antennas with necessary figures. 07
Q.2 (a) Find the radiation resistance of a hertizian dipole of length ?/10. 03
(b) Using reciprocity theorem to antenna show that effective lengths of 04
transmitting and receiving antennas are the same.
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(c) Explain and derive Friss Transmission Formula 07 Q.3 (a) Explain Principle of Pattern Multiplication. 03
(b) Explain Dolph-Tchebysheff distribution for linear arrays. 04
(c) Derive the far field components and the radiation resistance of a 07
small circular loop with radius ‘a’ and with a uniform phase current.
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Q.4 (a) Explain Application of Babinet’s Principle. 03
(b) Explain Yagi-Uda Antenna. 04
(c) Find out the length L ,width W and Half flare angles ?E and ?H of a 07
pyramidal horn antenna for which the mouth height h=10?.The horn
is fed by a rectangular waveguide with TE10 mode. (Given :
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?E =0.20? in E plane, ?H=0.375? in H plane) Q.5 (a) Explain Broadband antenna. 03
(b) Explain Cassegrain feed System with figure. 04
(c) Draw the Geometry of a helical antenna and explain its physical 07
parameters.
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Q.6 (a) Explain log Periodic antenna. 03
(b) Explain different feeding techniques of Microstrip antenna with 04
figure.
(c) With neat sketches briefly explain reflector lens antennas. Also write 07
its applications.
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Q.7 (a) Calculate the range of space wave propagation with heights of 03
transmitting and receiving antennas equal to 100 meters each.
(b) Explain Plasma antenna. 04
(c) Explain gain and phase measurement methods. 07
Q.8 (a) Explain UWB Antenna. 03
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(b) Explain Following:(i) Duct Propagation
(ii) OWF
(iii) Multi hop Propagation
(iv) Skip Distance
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