Download GTU BE/B.Tech 2018 Winter 6th Sem Old 161003 Antenna And Wave Propagation Question Paper

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Subject Code: 161003

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 (a) Explain following antenna parameters: 07
   1. Radiation resistance

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   2. Antenna efficiency
   3. Directivity
   4. Gain
2. Q.2 (b) Illustrate following terms with respect to radio wave propagation: 07
   1. Skip distance

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   2. Duct Propagation
   3. Tropospheric Scattering
3. Q.3 (a) Derive the expression of Friss transmission formula for radio link. 07
4. Q.3 (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

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   List out & explain different methods of antenna feeding. 07
5. Q.4 (a) List out and explain various types of array antenna with suitable diagrams. 07
6. Q.4 (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

   Explain following with respect to linear arrays: 07
   1. Schelkunoff theorem
   2. Discuss Dolph—Tchebysheff distribution

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7. Q.5 (a) Why smart antenna is called so? Explain in detail the concept of smart antenna with appropriate diagrams. 07
8. Q.5 (b) List out various antennas for special applications. Explain any two in brief. 07

1. List out various methods of antenna gain measurement. Describe any two in brief. 07

   OR

   State and explain babinet’s principle with necessary diagrams. 07

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2. Write a note on micro-strip antennas including salient features, shapes, pros & cons, and applications. 07

1. Q.5 (a) Write a brief note on following: 07
   1. Types of reflector antenna
   2. Types of horn antenna
2. Q.5 (b) Write a detailed note on role of ionosphere in sky wave propagation. 07

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1. Write a brief note on following: 07
   1. Types of lens antenna
   2. Types of slot antenna
2. Illustrate following terms with respect to radio wave propagation: 07
   1. Ground wave propagation
   2. Space wave propagation

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