Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 161003 Antenna And Wave Propagation Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161003 Date: 16/11/2018
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.
Q.1 (a) Explain following antenna parameters:
i. Radiation resistance
ii. Antenna efficiency
iii. Directivity
iv. Gain
07
(b) Illustrate following terms with respect to radio wave propagation:
i. Skip distance
ii. Duct Propagation
iii. Tropospheric Scattering
07
Q.2 (a) Derive the expression of Friss transmission formula for radio link. 07
(b) Explain the helical geometry with proper Diagram. List out various radiation
modes of helical antenna. Also write necessary equations describing each mode.
07
OR
(b) List out & explain different methods of antenna feeding. 07
Q.3 (a) List out and explain various types of array antenna with suitable diagrams. 07
(b) Design & draw 3-element Yagi-Uda antenna. Justify the role of reflector and
director. How gain of the antenna can be improved? Why should one use folded-
dipole?
07
OR
Q.3 (a) Explain following with respect to linear arrays:
i. Schelkunoff theorem
ii. Discuss Dolph?Tchebysheff distribution
07
(b) Why smart antenna is called so? Explain in detail the concept of smart antenna
with appropriate diagrams.
07
Q.4 (a) List out various antennas for special applications. Explain any two in brief. 07
(b) List out various methods of antenna gain measurement. Describe any two in brief. 07
OR
Q.4 (a) State and explain babinet?s principle with necessary diagrams. 07
(b) Write a note on micro-strip antennas including salient features, shapes, pros &
cons, and applications.
07
Q.5 (a) Write a brief note on following:
i. Types of lens antenna
ii. Types of slot antenna
07
(b) Illustrate following terms with respect to radio wave propagation:
i. Ground wave propagation
ii. Space wave propagation
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161003 Date: 16/11/2018
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.
Q.1 (a) Explain following antenna parameters:
i. Radiation resistance
ii. Antenna efficiency
iii. Directivity
iv. Gain
07
(b) Illustrate following terms with respect to radio wave propagation:
i. Skip distance
ii. Duct Propagation
iii. Tropospheric Scattering
07
Q.2 (a) Derive the expression of Friss transmission formula for radio link. 07
(b) Explain the helical geometry with proper Diagram. List out various radiation
modes of helical antenna. Also write necessary equations describing each mode.
07
OR
(b) List out & explain different methods of antenna feeding. 07
Q.3 (a) List out and explain various types of array antenna with suitable diagrams. 07
(b) Design & draw 3-element Yagi-Uda antenna. Justify the role of reflector and
director. How gain of the antenna can be improved? Why should one use folded-
dipole?
07
OR
Q.3 (a) Explain following with respect to linear arrays:
i. Schelkunoff theorem
ii. Discuss Dolph?Tchebysheff distribution
07
(b) Why smart antenna is called so? Explain in detail the concept of smart antenna
with appropriate diagrams.
07
Q.4 (a) List out various antennas for special applications. Explain any two in brief. 07
(b) List out various methods of antenna gain measurement. Describe any two in brief. 07
OR
Q.4 (a) State and explain babinet?s principle with necessary diagrams. 07
(b) Write a note on micro-strip antennas including salient features, shapes, pros &
cons, and applications.
07
Q.5 (a) Write a brief note on following:
i. Types of lens antenna
ii. Types of slot antenna
07
(b) Illustrate following terms with respect to radio wave propagation:
i. Ground wave propagation
ii. Space wave propagation
07
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2
OR
Q.5 (a) Write a brief note on following:
i. Types of reflector antenna
ii. Types of horn antenna
07
(b) Write a detailed note on role of ionosphere in sky wave propagation. 07
*************
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This post was last modified on 20 February 2020