Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2161003 Antenna And Wave Propagation Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161003 Date:20/11/2018
Subject Name:Antenna & Wave Propagation
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define Following Terms:
1.Beam Solid angle 2 Radiation pattern 3.Radiation density
03
(b) Define and explain radiation intensity with necessary equations. 04
(c) Explain radio Communication link between transmitting antenna and
receiving antenna.
07
Q.2 (a)
Define antenna list the function of antenna.
03
(b) The radiation resistance of antenna is 80? and loss resistance is 10?
calculate the antenna efficiency.
04
(c) Derive the expression of friss transmission formula. 07
OR
(c) Derive the expression for radiation resistance for half wave dipole. 07
Q.3 (a) What is the effective area of half wave dipole operating at 500MHz? 03
(b) Explain normal mode of radiation of helical antenna. 04
(c) Explain broadside and end-fire array considering linear array of four
isotropic sources.
07
OR
Q.3 (a) Find the radiation resistance of a hertizian dipole of length ?/60. 03
(b) Define and explain axial ratio for helical antenna. 04
(c) Explain principal of pattern multiplication for array of point sources. Also
give two examples of short dipoles.
07
Q.4 (a) Explain reflector lens antenna. 03
(b) Explain FNBW and HPBW of a parabolic reflector. 04
(c) Explain frequency scanning arrays with necessary details. 07
OR
Q.4 (a) Explain rumsey?s principle. 03
(b) List the advantages and disadvantages of parabolic reflector. 04
(c) Explain smart antenna with necessary details. 07
Q.5 (a) Explain the working of artificial lens antenna. 03
(b) List the feeding methods of microstrip patch antenna. Explain microstrip
line feed in detail.
04
(c) Explain the following
1) Skip distance 2) Virtual height
07
OR
Q.5 (a) Explain two antenna gain measurement method in detail. 03
(b) Explain ultra wide band antenna. 04
(c) Explain different modes of propagation with its practical significance. 07
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This post was last modified on 20 February 2020