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Posted Date: 30 Apr 2008 Posted By:: freebooks Member Level: Silver Points: 5 (Rs. 1)
2008 Anna University Chennai B.E Electronics & Tele-Communication Engineering EC 1352 -- Antenna and Wave propagation Question paper
B.E/B.Tech Degree Examination Nov/Dec 2007
Electronics and Communication Engineering
EC 1352 -- Antenna and wave propagation
Time : 3 hours Maximum : 100marks
Answer all the questions
part A -- (10*2=20marks)
1.Define a Hertzian dipole
2.Draw the radiation pattern of a horizontal dipole.
3.What is the relationship between effective aperture and directivity?
4.Define array factor
5.What are travelling wave antennas?
6.what do you understand by the impedance of antenna?
7.What are the applications of slot radiator?
8.What are the disadvantage of lens antenna?
9.Define skip distance.
10.What is duct propagation.
Part-B --(5*16=80 marks )
11.a. Derive the expression for the radiated field from a short dipole
b.Starting from first principles obtain the expression for the power radiated by a half wave dipole?
12.a.With a neat sketch explain the operation of Helical antenna?
b.Obtain the expression for the field and the radiation pattern produced by a 2 element array of infinitesimal dipole with distance of separation 1/2 and currents of equal magnitude and phase shift 180 degree
13.a.Describe the construction,principle of operation and design of rhombic antenna.
b.Explain the principle of operation of Log--Periodic array.
14.a.Discuss the radiation from slot antenna
b.Explain the principle of operation and application of parabolic reflector?
15.a i.Explain the Mechanism of ionospheric propagation. (12)
ii.What is diversity reception
b.Write explanatory notes on
i.Critical Frequency (6)
ii.Troposheric propagation (5)
iii. Ground wave propagation (5)
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