Download GTU BE/B.Tech 2019 Summer 6th Sem New 2161003 Antenna And Wave Propagation Question Paper

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Seat No.:

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VI(NEW) — EXAMINATION - SUMMER 2019

Subject Code:2161003 Date:14/05/2019

Subject Name:Antenna & Wave Propagation

Time:10:30 AM TO 01:00 PM

Instructions:

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

Q.1

1. (a) Define terms with respect to Antenna systems:
   1. Antenna

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   2. Beam efficiency
   3. Radiation intensity
   4. Directivity
   5. Gain of the antenna
   6. Effective length of antenna

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   7. Effective aperture.
2. (b) Define terms Polarization and modes of propagating waves. With appropriate figures describe different polarizations of an EM wave while its propagation.

OR

1. (a) List out various types of Antenna systems.

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2. (b) “Radiation resistance of a quadrature wavelength monopole antenna is 36.5 O”. Justify your answer with necessary calculations for it.

Q.2

1. (a) Explain in detail about Hertzian Dipole antenna systems. Also calculate radiation resistance value of a Hertzian dipole antenna of having length ?/40, ?/60 and ?/80 respectively.

OR

1. (a) Obtain the ratio of Eo and Ha field components of a current element at a distance point in free space, with necessary derivations using Maxwell’s equation.

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Q.3

1. (a) Enlist different atmospheric layers with their approximate height, to be considered while wave propagation.
2. (b) Describe the principle of pattern multiplication in the working of Array antennas.

OR

1. (a) State Babinet’s principle and discuss its usability in the slot antennas and complementary antennas. “Log periodic antenna offers wide band width operations.” Justify your answer.

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Q.4

1. (a) Draw field pattern of an array of 4 isotropic point sources separated by half wave length distance.
2. (b) Enlist and discuss about various antenna field radiation zones briefly.

OR

1. (a) Prove that during wave propagation phenomenon MUF=fc/Cos(T). Also derive equations of gain of parabolic disc antenna.

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Q.5

1. (a) Explain about log periodic antenna with necessary figures.
2. (b) Enlist different feeding methods for antenna systems and describe any one of them in detail.

OR

1. (a) List out all antenna Gain measurement methods and describe any two of them in detail.

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Q.5

1. (a) Explain about loop antenna with necessary details.
2. (b) Describe lens antenna in detail.

OR

1. (a) Describe Ultra-Wide Band (UWB) antenna in brief.

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2. (b) Draw five elements Yagi-Uda antenna system. Suggest ways to improve working performance of basic Yagi-Uda antenna.
3. (c) Explain terms with reference to Wave propagation phenomenon:
   1. Duct propagation
   2. Virtual height
   3. MUF
   4. Skip distance

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OR

1. (a) Describe Smart antennas briefly.
2. (b) Differentiate End fire and Broadside array antennas.
3. (c) Describe Micro strip antenna in detail. Also enlist advantages and disadvantages related to them.

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Total Marks: 70

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