Code No: RR310402 RR Set No. 2
III B.Tech I Semester Supplementary Examinations,June 2010
ANTENNAS AND WAVE PROPAGATION
Common to Electronics And Telematics, Electronics And Communication
Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) List out the frequency ranges of operation and applications of i. Loop antennas
ii. Helical antennas
iii. Lens antennas.
(b) Derive the EMF equation for a small loop antenna. [12+4]
2. (a) How can a unidirectional pattern be obtained in an end fire array? Explain in detail.
(b) Draw the radiation pattern of 8 isotropic elements fed in phase, spaced λ/2
apart with the principle of pattern multiplication. [8+8]
3. (a) Distinguish between the terms: effective length and effective area and deduce
the relation between them.
(b) How is the radiation pattern of an antenna specified?
(c) Find the directivity and HPBW of an antenna having a unidirectional cosθ
radiation intensity pattern. [6+4+6]
4. Write notes on
(a) M curves and their characteristics.
(b) Troposcatter Propagation of electromagnetic waves. [6+10]
5. Both very long waves and short waves can be used for world wide radio communica- tion. Give general account of the propagation phenomena and frequencies involved in the two cases and discuss the advantages and disadvantages of the two systems. [16]
6. (a) Distinguish between electrostatic field term, near and far zone field terms for electric and magnetic fields due to a short oscillating current element.
(b) Taking expression for radiation fields, compute power radiated by the current element.
(c) Define a Hertzian dipole and an Oscillating current element and distinguish between them. Sketch the radiation pattern for a vertical Hertzian dipole, in both principal planes. [6+4+6]
1
Code No: RR310402 RR Set No. 2
7. (a) What is an Optimum Horn? Sketch and explain the characteristics of an optimal pyramidal horn, along with the dimensional relations.
(b) List out the frequency ranges of usage and applications of different lens an- tennas. [10+6]
8. (a) Compare the requirements and radiation characteristics of resonant and non- resonant radiators.
(b) Determine the lengths and spacing requirements for a 3-element Yagi -Uda antenna array at 500 MHz, and explain its characteristics. [6+10]
? ? ? ? ?
2
Code No: RR310402 RR Set No. 4
III B.Tech I Semester Supplementary Examinations,June 2010
ANTENNAS AND WAVE PROPAGATION
Common to Electronics And Telematics, Electronics And Communication
Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) How can a unidirectional pattern be is obtained in an end fire array? Explain in
detail.
(b) Draw the radiation pattern of 8 isotropic elements fed in phase, spaced λ/2 apart with the principle of pattern multiplication. [8+8]
2. Write notes on
(a) M curves and their characteristics.
(b) Troposcatter Propagation of electromagnetic waves. [6+10]
3. (a) What is an Optimum Horn? Sketch and explain the characteristics of an optimal pyramidal horn, along with the dimensional relations.
(b) List out the frequency ranges of usage and applications of different lens an-
tennas. [10+6]
4. (a) Compare the requirements and radiation characteristics of resonant and non- resonant radiators?
(b) Determine the lengths and spacing requirements for a 3-element Yagi -Uda antenna array at 500 MHz, and explain its characteristics. [6+10]
5. (a) List out the frequency ranges of operation and applications of
i. Loop antennas
ii. Helical antennas iii. Lens antennas.
(b) Derive the EMF equation for a small loop antenna. [12+4]
6. Both very long waves and short waves can be used for world wide radio communica- tion. Give general account of the propagation phenomena and frequencies involved in the two cases and discuss the advantages and disadvantages of the two systems. [16]
7. (a) Distinguish between the terms: effective length and effective area and deduce the relation between them.
(b) How is the radiation pattern of an antenna specified?
(c) Find the directivity and HPBW of an antenna having a unidirectional cosθ
radiation intensity pattern. [6+4+6]
3
Code No: RR310402 RR Set No. 4
8. (a) Distinguish between electrostatic field term, near and far zone field terms for electric and magnetic fields due to a short oscillating current element.
(b) Taking expression for radiation fields, compute power radiated by the current element.
(c) Define a Hertzian dipole and an Oscillating current element and distinguish between them. Sketch the radiation pattern for a vertical Hertzian dipole, in both principal planes. [6+4+6]
? ? ? ? ?
4
Code No: RR310402 RR Set No. 1
III B.Tech I Semester Supplementary Examinations,June 2010
ANTENNAS AND WAVE PROPAGATION
Common to Electronics And Telematics, Electronics And Communication
Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) List out the frequency ranges of operation and applications of
i. Loop antennas
ii. Helical antennas iii. Lens antennas.
(b) Derive the EMF equation for a small loop antenna. [12+4]
2. (a) Compare the requirements and radiation characteristics of resonant and non- resonant radiators?
(b) Determine the lengths and spacing requirements for a 3-element Yagi -Uda
antenna array at 500 MHz, and explain its characteristics. [6+10]
3. (a) What is an Optimum Horn? Sketch and explain the characteristics of an
optimal pyramidal horn, along with the dimensional relations.
(b) List out the frequency ranges of usage and applications of different lens an- tennas. [10+6]
4. Write notes on
(a) M curves and their characteristics.
(b) Troposcatter Propagation of electromagnetic waves. [6+10]
5. (a) How can unidirectional pattern be obtained in an end fire array? Explain in
detail?
(b) Draw the radiation pattern of 8 isotropic elements fed in phase, spaced λ/2 apart with the principle of pattern multiplication. [8+8]
6. (a) Distinguish between electrostatic field term, near and far zone field terms for electric and magnetic fields due to a short oscillating current element.
(b) Taking expression for radiation fields, compute power radiated by the current
element.
(c) Define a Hertzian dipole and an Oscillating current element and distinguish between them. Sketch the radiation pattern for a vertical Hertzian dipole, in both principal planes. [6+4+6]
7. (a) Distinguish between the terms: effective length and effective area and deduce the relation between them.
5
Code No: RR310402 RR Set No. 1
(b) How is the radiation pattern of an antenna specified?
(c) Find the directivity and HPBW of an antenna having a unidirectional cosθ
radiation intensity pattern. [6+4+6]
8. Both very long waves and short waves can be used for world wide radio communica- tion. Give general account of the propagation phenomena and frequencies involved in the two cases and discuss the advantages and disadvantages of the two systems. [16]
? ? ? ? ?
6
Code No: RR310402 RR Set No. 3
III B.Tech I Semester Supplementary Examinations,June 2010
ANTENNAS AND WAVE PROPAGATION
Common to Electronics And Telematics, Electronics And Communication
Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Distinguish between the terms: effective length and effective area and deduce the relation between them.
(b) How is the radiation pattern of an antenna specified?
(c) Find the directivity and HPBW of an antenna having a unidirectional cosθ
radiation intensity pattern. [6+4+6]
2. (a) List out the frequency ranges of operation and applications of i. Loop antennas
ii. Helical antennas
iii. Lens antennas.
(b) Derive the EMF equation for a small loop antenna. [12+4]
3. (a) What is an Optimum Horn? Sketch and explain the characteristics of an
optimal pyramidal horn, along with the dimensional relations.
(b) List out the frequency ranges of usage and applications of different lens an- tennas. [10+6]
4. Write notes on
(a) M curves and their characteristics.
(b) Troposcatter Propagation of electromagnetic waves. [6+10]
5. (a) Distinguish between electrostatic field term, near and far zone field terms for
electric and magnetic fields due to a short oscillating current element.
(b) Taking expression for radiation fields, compute power radiated by the current
element.
(c) Define a Hertzian dipole and an Oscillating current element and distinguish between them. Sketch the radiation pattern for a vertical Hertzian dipole, in both principal planes. [6+4+6]
6. (a) Compare the requirements and radiation characteristics of resonant and non- resonant radiators?
(b) Determine the lengths and spacing requirements for a 3-element Yagi -Uda antenna array at 500 MHz, and explain its characteristics. [6+10]
7
Code No: RR310402 RR Set No. 3
7. (a) How can unidirectional pattern be obtained in an end fire array? Explain in detail?
(b) Draw the radiation pattern of 8 isotropic elements fed in phase, spaced λ/2 apart with the principle of pattern multiplication. [8+8]
8. Both very long waves and short waves can be used for world wide radio communica- tion. Give general account of the propagation phenomena and frequencies involved in the two cases and discuss the advantages and disadvantages of the two systems. [16]
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