EC6602 Antenna and Wave Propagation Important Questions Nov Dec 2017 – EC6602 AWP 2 marks 16 marks Download PDF

EC6602 Antenna and Wave Propagation Important Questions Nov Dec 2017 – EC6602 AWP 2 marks 16 marks Download PDF 


Here we have provided EC6602 Antenna and Wave Propagation Important Questions April May 2016. here EC6602 ECE expected Questions are posted and Students can download the Questions and make use of it. ECE 6th Semester EC6602 ECE April May 2016 Important Questions are provided Below.

DEPARTMENT OF ECE
Anna University , Chennai
Department of B.E-Electronics And Communication Engineering
Sixth Semester
EC6602 Antenna and Wave propagation
Important Part A 2 Mark Part B 16 Mark Question Bank
(Regulation 2013) 

Unit – I

1. Derive the Electric and magnetic field componenets of a Hertzian dipole. (MAY 2015)
2. Two spacecrafts are serated by 3Km. Each has an antenna with directicity D=200 operating
at 2GHz. If craft A’s receive 20db power what is the transmitted power by craft B? (MAY
2015)
3. Explain the following terms with respect to antenna. (MAY 2015)
a. Polarization
b. Effective sperture
c. Directivity
4. Derive the wave equations using Maxwell’s equations and get the solution of wave
equations. (DEC 2014)
5. Explain how electric field lines are formed and get detached from short dipole antenna.
(DEC 2014)
6. The power radiated by a lossles antenna is 10 watts. The irectional characteristics of the antenna are represented by the radiation intensity of (DEC 2014)

Find the maximum power density at a distance of 100m , assuming for m field distance. Specify the angel where this occurs and find the directivity and half power beamwidth of the antenna.
7. Define the following parameters and their dependence on antenna perfoemance 1)Radiation
pattern 2)Input impedence 3)Polarization (JUN 2014)
8. Derive the magnetic field components of a dipole having the dimension n l <<l / 2 . .(JUN
2014)
9. Explain the terms 1)Beam solid angel 2)Antenna temperature 3)Reciprocity of antenna.
(JUN 2014)
10. Derive the current and vector potential of a Hertzian dipole. (JUN 2014)
Unit – II

1. Derive the field quantities and draw radiation pattern for a half wavelength dipole. (MAY
2015)
2. Two identical radiators are spaced d=3 l /4 meters apart and fed with currents of equal
magnitude but with 1800
phase difference. Evaluate the resulting radiation identity the
direction of maximum and minimum radiation. (MAY 2015)
3. Obtain the expressions for power radiated and the radiation resistance a Half wave dipole.
(DEC 2014)
4. Describe the expressions for power radiated and the radiations resistance of a Half wave
dipole. (DEC 2014)
5. Describe the method of pattern multiplication. (DEC 2014)
6. A linear broadside array consists of 4 equal isotropic point sources with l / 3 spacing. Find
the Directivity and beamwidth. (DEC 2014)
7. Derive the electric and magnetic field components of a finite length dipole antenna and
show its current distribution with respect to its length in terms of wavelength. (JUN 2014)
8. Derive the expression for the field produced by a linear array and deduce it for an end fire
array. (JUN 2014)
9. Compare End fire and broadside array. (JUN 2014)
Unit – III

1. Explain the radiation mechanism of horn antenna with diagram. Draw the different types of
horn structure. (MAY 2015)
2. Explain the principle of Reflector antenna and discuss on different types a feed used with
neat diagram. (MAY 2015)
3. Explain the effect of earth on radiation patterns above earth. (DEC 2014)
4. Discuss in detail the methods of feeding slot antenna. (DEC 2014)
5. Describe the radiation patterns and fileld on the axis of an E-plane and H-plane sectoral
horns. (DEC 2014)
6. Explain the principle of rectangular horn antenna with a neat sketch. (JUN 2014)
7. Explain the salient features of Flat and corner frelector antenna. (JUN 2014)
8. With neat diagram explain the principle of Parabolic reflector antenna and various types of
feed used. (JUN 2014)
Unit – IV

1. What are the importance of Helical antenna? Explain the the construction and operation of
Helical antenna with neat sketch. (MAY 2015)
2. Explain the principle of operation of Log periodic antenna with neat schematic diagram.
(MAY 2015)
3. Explain the construction and characteristics features of frequency independent antennas.
(DEC 2014)
4. Illustrate the reciprocity in antenna measurements. (DEC 2014)
5. Describe construction and radiation characteristics of narmal and axial mode helical
antenna. (DEC 2014)
6. Explain the measurement of antenna gain. (JUN 2014)
7. With necessary illustrations explain the radiation characteristics of YagiUda antenna. (JUN
2014)
8. With suitable diagram explain the construction and principle of Helical antenna in different
mode of operation. (JUN 2014)
Unit – V
1. Draw the structure of ionosphere and explain the mechanism of ionosphere propagation.
(MAY 2015)
2. Explain the effects of magnetic fields on EM wave prpogation. (MAY 2015)
3. Explain the terms(MAY 2015)
a. MUF
b. Virtual height
c. Duct Propogarion
d. Skip distance
e. Fading
4. Explain the mechanism of tropospheric propagation. (MAY 2015)
5. Explain in detail the mechanism of space wave propagation over ideal flat earth with a neat
sketch. (DEC 2014)
6. Discuss the factors that give rise to fading in ionospheric radio wave propagation. (DEC
2014)
7. Describe the significant features of ground wave propagation. (DEC 2014)
8. Obtain an expression for the refractive of an ionospheric layer. (DEC 2014)
9. Explain the ground wave propagation of radio waves. (JUN 2014)
10. Write notes on faraday rotation. (JUN 2014)
11. Describe the space wave propagation and explain the importane of line of sight
propagation. (JUN 2014)
12. Explain the following terms with diagram 1)Duct propagation 2)ciritical frequency 3)skip
zone. (JUN 2014)
DEPARTMENT OF ECE
EC6602 ANTENNA AND WAVE PROPAGATION
IMPORTANT QUESTIONS
PART – A

1. What is meant by radiation resistance? Apr/May 2016
2. Why antenna measurements are usually done in fraunhofer zone? Apr/May2016
3. Define power gain.Nov/Dec 2013
4. A dipole antenna has a radiation resistance of 72Ω, a loss resistance of 20Ω.What is its
directivity if the power gain is 16?Apr/May 2016
5. Define skip distance. Nov/Dec2014
6. Find the range of LOS system when the receive and transmit antenna height are 10m and 100m
respectively.Apr/May2016
7. What is meant by Antenna array?Apr/May 2016
8. State the principle of the pattern multiplication.Apr/May 2011
9. Differentiate broadside and end fire array.Nov/Dec 2011
10. List the applications of parabolic reflector.Nov/Dec 2013
11. Compare short dipole from half dipole.Apr/May 2014
12. Mention the requirements of an anechoic chamber.Nov/Dec 2013
13. On what principle slot antenna works? Explain the principle.Apr/May 2011
14. Define pitch angle of a helical antenna.Nov/Dec2014
15. Differentiate near and far field.Apr/May2015
16. Define gain of an antenna. Bring out a relationship between gain and aperture of an
antenna.Apr/May2016
17. Why frequency independent antenna are called so?Apr/May 2014
18. The voltage induced by the application of an electric field of strength 2 volts/meter is 0.7,
calculate the effective length of the element.Nov/Dec 2016
19. State Rumsey’s principle. Apr/May 2016
20. Compare and contrast wedges and pyramids.Nov/Dec 2016
21. State Huygens principle.Apr/May 2011
22. What are the applications of micro strip antenna?Apr/May 2015
23. Find the critical frequency of an ionosphere layer which has an electron density of 1.21 x106
cm-3
.Nov/Dec 2012
24. What is meant by duct propagation?Apr/May 2011
PART B ( Most Impotent )

1. Give a detailed note on:Expected
(i)Antenna Bandwidth (4)
(ii) Antenna Beamwidth (4)
(iii) Antenna input impedance (8)
2.Explain in detail about types of reflector antenna. Apr/May 2011, Apr/May 2013(16)
3. Derive the expression for far field and radiated power of a half wave dipole
antenna.Apr/May 2013, Apr/May 2016, Apr/May 2014
(16)
4. Describe a broadside array. Deduce an expression for the radiation pattern of a broadside array
with two point sources.Apr/May 2013 (16)
5. Explain the construction, working principle and different shapes of slot antenna. Nov/Dec
2014 (16)
6. Discuss the working and radiation characteristics of Helical antenna.Apr/May 2013 (16)
7. Explain the following with respect to the ionosphere.
(i)Virtual height Apr/May 2011, Apr/May 2015 (4)
(ii)Critical frequency Apr/May 2014 (4)
(iii)Skip distance Apr/May 2014 (4)
(iv)Maximum Usable frequency Apr/May 2011 (4)

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