Download AKTU B-Tech 6th Sem 2016-2017 EEC029 Antenna And Wave Propagation Awp Question Paper

B.TECH.

THEORY EXAMINATION (SEM–VI) 2016-17

ANTENNA & WAVE PROPAGATION (AWP)

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Time: 3 Hours

Max. Marks : 100

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Note: Be precise in your answer. In case of numerical problem assume data wherever not provided.

SECTION – A

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1. Explain the following: 10 x 2 = 20

1. Define radiation pattern for an antenna.
2. What is virtual height?
3. Define directivity and resolution for an antenna.
4. Define beam efficiency and stray factor in antenna terminology.

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5. Define term antenna temperature.
6. What is signal to noise ratio in antenna.
7. Draw the resultant pattern of 4 isotropic elements by pattern multiplication method.
8. What is space wave communication?
9. How can increase the bandwidth of patch antenna?

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10. Can normal propagation possible If frequency of incidence radio wave is equal to gyro frequency?

SECTION – B

Attempt any five of the following questions: 5 x 10 = 50

2. (a) Derive the relation for total far field for array of two point sources with equal amplitude & phase and find out the maximum and Minimum direction for radiation pattern. (b) Explain the terms field from oscillating dipole with with suitable diagram. (c) Explain Turstile Antenna. (d) Why we use feed method in antenna principle of parabolic reflector. (e) Explain binomial array. (f) Write the method of excitation of an antenna. Explain different type of feed method for its application. (g) Describe design yagi uda antenna, characteristics, radiation pattern, with (h) Describe horn antenna?

SECTION-C

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Attempt any two of the following questions: 2 x 15 = 30

3. Explain the different type of modes of propagation.
4. Write the short note of following :
   1. Radiation resistance
   2. Skip distance.

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5. Define an antenna & derive the relation for total electric field having linear array of n Isotropic point sources of equal amplitude and spacing.