Exam Details
| Subject | antennas and propagation | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Institute Of Aeronautical Engineering | |
| Position | ||
| Exam Date | November, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No Question Paper Code: AEC011
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech V Semester End Examinations (Regular) November, 2018
Regulation: IARE R16
ANTENNAS AND PROPAGATION
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Derive the equation relating directivity and effective aperture of an antenna. Estimate the
directivity of an antenna with HP HP =20 and find the gain of the antenna if efficiency
K=0.8.
Derive the near fields and far fields radiated by a current element with uniform current distribution.
2. Show that the radiation resistance of a half wave dipole is 73
and derive its directivity.
Using image theory, derive the fields radiated by a Quarter wave monopole antenna
UNIT II
3. Derive the expression for directivity of broad side array.
Draw the Yagi-Uda antenna and sketch its radiation pattern. Write down the design equations
of Yagi-Uda antenna.
4. With neat diagram explain how an array of 2 isotropic point sources can produce radiation
patterns with uniform phase.
Describe the design considerations for monofilar helical antenna to operate in axial and normal
mode.
UNIT III
5. What are the uses of horn antennas? Explain the design considerations of pyramidal horn antenna.
Derive an expression for the impedance of Slot antenna.
6. Mention the characteristics of microstrip patch antenna and describe the geometry of rectangular
patch antenna.
Explain the working of non-metallic dielectric lens antenna with neat diagram.
Page 1 of 2
UNIT IV
7. Describe in detail about Offset, Cassegrain and Gregorian feeding methods used in parabolic
reflector
Explain in detail about near field and far field antenna measurements.
8. Discuss in brief about sources of errors in antenna radiation pattern measurements and illustrate
the pattern measurement arrangements.
Explain how gain of an antenna under test is measured using comparison method with neat
diagram.
UNIT V
9. Explain in detail about how does the plane earth reflects in ground wave propagation.
Explain the mechanism of wave reflection by Ionosphere in detail.
10. Derive the relation between MUF Skip distance.
The space wave propagates between transmitting and receiving stations of heights h1 and h2
respectively. Derive expression for the field strength.
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech V Semester End Examinations (Regular) November, 2018
Regulation: IARE R16
ANTENNAS AND PROPAGATION
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Derive the equation relating directivity and effective aperture of an antenna. Estimate the
directivity of an antenna with HP HP =20 and find the gain of the antenna if efficiency
K=0.8.
Derive the near fields and far fields radiated by a current element with uniform current distribution.
2. Show that the radiation resistance of a half wave dipole is 73
and derive its directivity.
Using image theory, derive the fields radiated by a Quarter wave monopole antenna
UNIT II
3. Derive the expression for directivity of broad side array.
Draw the Yagi-Uda antenna and sketch its radiation pattern. Write down the design equations
of Yagi-Uda antenna.
4. With neat diagram explain how an array of 2 isotropic point sources can produce radiation
patterns with uniform phase.
Describe the design considerations for monofilar helical antenna to operate in axial and normal
mode.
UNIT III
5. What are the uses of horn antennas? Explain the design considerations of pyramidal horn antenna.
Derive an expression for the impedance of Slot antenna.
6. Mention the characteristics of microstrip patch antenna and describe the geometry of rectangular
patch antenna.
Explain the working of non-metallic dielectric lens antenna with neat diagram.
Page 1 of 2
UNIT IV
7. Describe in detail about Offset, Cassegrain and Gregorian feeding methods used in parabolic
reflector
Explain in detail about near field and far field antenna measurements.
8. Discuss in brief about sources of errors in antenna radiation pattern measurements and illustrate
the pattern measurement arrangements.
Explain how gain of an antenna under test is measured using comparison method with neat
diagram.
UNIT V
9. Explain in detail about how does the plane earth reflects in ground wave propagation.
Explain the mechanism of wave reflection by Ionosphere in detail.
10. Derive the relation between MUF Skip distance.
The space wave propagates between transmitting and receiving stations of heights h1 and h2
respectively. Derive expression for the field strength.
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