Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 6th Sem 2161003 Antenna And Wave Propagation Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VI (NEW) EXAMINATION ? WINTER 2020
Subject Code:2161003 Date:22/01/2021
Subject 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.
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
(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.
(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.
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 and of a
07
pyramidal horn antenna for which the mouth height h=10.The horn
is fed by a rectangular waveguide with 10 mode. (Given :
= 0.20 in E plane, = 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.
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.
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
1
(b) With figure describe Ionosphere layers.
04
(c) Explain Following:
07
(i)
Duct Propagation
(ii)
OWF
(iii)
Multi hop Propagation
(iv)
Skip Distance
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This post was last modified on 04 March 2021