Download AKTU B-Tech 6th Sem 2014-2015 Anteena and Wave Propogation Question Paper

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Printed Pages : 3 EEC029

(Following Paper ID and Roll No. to be filled in your Answer Book)

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PAPER ID : 121654

Roll No.

B. Tech.

(SEM. VI) THEORY EXAMINATION, 2014-15

ANTENNA & WAVE PROPAGATION

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Time : 2 Hours] [Total Marks : 50

Note: Attempt all problem.

Answer any four parts of the following : 3.5×4=14

1. (a) Calculate the radiation resistance of antenna length of ?/2, ?/4 and ?.
2. (b) Discuss Gain, Power Gain, Directive Gain, Directivity.

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3. (c) Explain reciprocity theorem in brief.
4. (d) Differentiate in between Near and Far Field.
5. (e) Calculate the directivity of antenna whose pattern is given by f = fm sin² ? sin² f, 0 = ? = p& 0 = f= 2p.
6. (f) Justify "Antenna is transducer".

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Answer any two parts of the following : 6×2=12

1. (a) Differentiate among Broadside, Endfire, Binomial and Chebeshev array.
2. (b) Draw the radiation pattern of four isotropic point separated at the distance of ?/4 in broad side sense. Discuss pattern multiplication theorem.
3. (c) Prove that Gain and Aperture can be related as Ae = G(?²/4p).

Answer any two parts of the following: 6×2=12

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1. (a) Discuss the operation of parabolic Reflector. What is spill over? How it is removed ? Discuss Cassegrain feeds also.
2. (b) Discuss Rumsey principles. Where it is used ? Name that antenna after explaining the operation and characteristics and other use.
3. (c) Discuss the designing of Yagi-Uda antenna and Explain its limitations.

Answer any one part of the following : 12×1=12

1. (a) Discuss the operation of ionosphere. Prove that refractive index is given by µ = v1-(81N/f²) where N is concentration of ions and f is operated frequency.

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2. (b) Explain:
   1. (1) Skip distance
   2. (2) Duct propagation
   3. (3) Maximum unusable frequency
   4. (4) Fading
   5. (5) Critical frequency.

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