2012 Kannur University B.Tech Electronics and Communications Engineering VI Semester B.Tech. (Regular/Supplementary/Improvement - Including Part Time) Degree Examination PT 2K6/2K6 EC 603 : RADIATION AND PROPAGATION Question paper
VI Semester B.Tech. (Regular/Supplementary/Improvement - Including
Part Time) Degree Examination, May 2012
(2007 Admn. Onwards)
PT 2K6/2K6 EC 603 : RADIATION AND PROPAGATION
Time : 3 Hours Max. Marks : 100
Instruction : Answer all questions.
PART- A
1. Explain directivity and gain. How are they related ? [Marks 5]
2. Explain effective height of an antenna. [Marks 5]
3. Write a note on end fire arrays. [Marks 5]
4. Explain the multiplication of radiation patterns. [Marks 5]
5. Discuss the radiation pattern of a V-antenna. [Marks 5]
6. Write a note on log-periodic antenna. [Marks 5]
7. Write a note on skip distance. [Marks 5]
8. Discuss multihop propagation. [Marks 5]
PART- B
9. a) Write a note on each :
i) Hertzian dipole
ii) Beam solid angle
iii) Half power band width. [Marks 15]
OR
b) i) A thin dipole antenna is Lambda/8 long. If its loss resistance is 1.5 ohm. Find its
radiation resistance and efficiency. [Marks 8]
ii) state and prove Babinets principle for complementary antennas. [Marks 7]
10. a) Find the array factor and draw the normalized radiation pattern of a broad
side array of five isotropic radiation spaced Lambda/2 apart.The excitation amplitude
ratios are 1 : 2 : 3 :2: 1. Compare the first side lobe level with that of a five
element uniform array. [Marks 15]
OR
b) i) Design a 6 element end fire array with l,/2 spacing between elements .
The pattern is to be optimum with a side lobe level 13.9 dB down the main
lobe maximum. [Marks 10]
ii) Write a note on tapering of array. [Marks 5]
11. a) Write brief notes on:
i) Parabolic reflector antenna
ii) V-antenna
iii) Micro strip antenna. [Marks 15]
OR
b) Discuss the design procedure of a Yagi-uda antenna ? What are its applications ? [Marks 15]
12. a) Write notes on :
i) Ionospheric storm
ii) Whistling
iii) Fading. [Marks 15]
OR
b) Discuss the features of ground wave propagation, tropospheric scatter
propagation and spherical earth propagation. [Marks 15]
Part Time) Degree Examination, May 2012
(2007 Admn. Onwards)
PT 2K6/2K6 EC 603 : RADIATION AND PROPAGATION
Time : 3 Hours Max. Marks : 100
Instruction : Answer all questions.
PART- A
1. Explain directivity and gain. How are they related ? [Marks 5]
2. Explain effective height of an antenna. [Marks 5]
3. Write a note on end fire arrays. [Marks 5]
4. Explain the multiplication of radiation patterns. [Marks 5]
5. Discuss the radiation pattern of a V-antenna. [Marks 5]
6. Write a note on log-periodic antenna. [Marks 5]
7. Write a note on skip distance. [Marks 5]
8. Discuss multihop propagation. [Marks 5]
PART- B
9. a) Write a note on each :
i) Hertzian dipole
ii) Beam solid angle
iii) Half power band width. [Marks 15]
OR
b) i) A thin dipole antenna is Lambda/8 long. If its loss resistance is 1.5 ohm. Find its
radiation resistance and efficiency. [Marks 8]
ii) state and prove Babinets principle for complementary antennas. [Marks 7]
10. a) Find the array factor and draw the normalized radiation pattern of a broad
side array of five isotropic radiation spaced Lambda/2 apart.The excitation amplitude
ratios are 1 : 2 : 3 :2: 1. Compare the first side lobe level with that of a five
element uniform array. [Marks 15]
OR
b) i) Design a 6 element end fire array with l,/2 spacing between elements .
The pattern is to be optimum with a side lobe level 13.9 dB down the main
lobe maximum. [Marks 10]
ii) Write a note on tapering of array. [Marks 5]
11. a) Write brief notes on:
i) Parabolic reflector antenna
ii) V-antenna
iii) Micro strip antenna. [Marks 15]
OR
b) Discuss the design procedure of a Yagi-uda antenna ? What are its applications ? [Marks 15]
12. a) Write notes on :
i) Ionospheric storm
ii) Whistling
iii) Fading. [Marks 15]
OR
b) Discuss the features of ground wave propagation, tropospheric scatter
propagation and spherical earth propagation. [Marks 15]
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