GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
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Subject Code: 161003 Date: 04/12/2019
Subject Name: Antenna & Wave Propagation
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
(a) Define (i) Directivity (ii) HPBW (iii) FNBW (iv) Radiation Resistance (v) Radiation intensity (vi) Gain (vii) Beam area. [07]
(b) Write a detail note on types of antenna with necessary diagrams. [07]
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Q.2
(a) Discuss feeding Methods of Dipole. [07]
(b) Write a short note on Antenna Radiation Pattern with necessary figure. [07]
OR
(b) Derive Friss Transmission formula. [07]
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Q.3
(a) Explain Antenna Field zones. [07]
(b) Derive the Expressions of Maxima, Minima and Half power points for End fire array. [07]
OR
Q.3
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(a) Derive the Expressions of Maxima, Minima and Half power points for Broad side array. [07]
(b) Explain principle of Pattern Multiplication. [07]
Q.4
(a) What do you mean by Antenna Synthesis? Explain Schelkunoff theorem in brief. [07]
(b) Write a short note on Loop antenna. [07]
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OR
Q.4
(a) Discuss two Modes of Helical antenna. Enlist the design step for any one mode with the help of necessary formula. [07]
(b) Explain Yagi Uda antenna-in detail. [07]
Q.5
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(a) Explain different types of Reflector antennas. [07]
(b) Explain Babibet’s principal for slot antenna. [07]
OR
Q.5
(a) Explain different Modes of Propagation with its Practical significance. [07]
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(b) Explain (i) Skip Distance (ii) Critical Frequency (iii) MUF [07]
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