STUPIDSID
1 (a)
Explain (i) Retarded Potential (ii) Circular polarization (iii) Effective length of antenna (iv)
Skip Distance (v)Virtual Height (vi) Antenna Efficiency (vii) Resonant Antenna
7 M
1 (b)
Explain (i) Binomial array (ii) Arrays with Parasitic elements.
7 M
2 (a)
Explain (i) Hertzian Dipole (ii) Folded Dipole.
7 M
2 (b) (i)
Design maximum E type rhombic antenna for an elevation angle of ?=150 .Derive the
equation used.
4 M
2 (b) (ii)
Determine the gain ,beamwidth and capture area for a parabolic antenna with 10m diameter dish and dipole feed at 10 GHz.
3 M
2 (c)
Obtain the ratio of Eθ and HΦ field components of a current element at a distance point in
free space with necessary derivations using Maxwell's equations.
7 M
3 (a)
For uniform linear array of "n" isotropic sources,obtain the expression for relative electric
field at a far point.Find nulls and maximas of an array pattern formed by four isotropic
antenna fed in phase and spaced λ/2 apart.
7 M
3 (b)
Discuss the use of Dolph-Tchebysheff distribution and polynomials in detail in antenna
array design.
7 M
3 (c)
xplain the construction and working principle ,advantages and disadvantages of following antennas: (i) Rhombic antenna (ii) Microstrip antenna.
7 M
3 (d)
State and explain Skelkunoff's theorems for antenna arrays.
7 M
4 (a)
Derive interrelation between spacing ,circumference,turn length,diameter for T1 modefor
helix treating it as an array. A helix operates at 2 GHz has dimensions: S=5cm,
D=10cm,N=20.Find out 3dB beamwidth and directivity.
7 M
4 (b)
Prove that the expressions for electric and magnetic fields for a small loop are same as these
obtained by treating it as a short magnetic dipole.
7 M
4 (c)
What is the function of a horn antenna? Discuss various types of rectangular and circular horn antennas.Give the optimum horn dimensions?
7 M
4 (d)
Derive the expression for Two isotropic point sources of the same amplitude and (i)same phase (ii) opposite phase of feed currents and sketch the radiation pattern for
α=π with spacing between elements d=λ/2.
α=π with spacing between elements d=λ/2.
7 M
5 (a) (i)
Describe: The structure and the Characteristics of Ionospheric layers.
4 M
5 (a) (ii)
Describe: Nonmetallic dielectric lens antenna
3 M
5 (b)
Discuss the methods for (i) measuring the Power gain of an antenna (ii) Feeding for
parabolic reflectors.
7 M
5 (c)
Explain Spacewave Propagation .State the factors determining the range of propagation.For
this mode of propagation obtain expression for electric field at the receiver neglecting earth
Curvature.,
7 M
5 (d)
State Babinet's principle and illustrate its application to slot in an infinite metal and
complementar metal strip Expalin the radiation patterns of a slot in an infinite sheet and of
complementary dipole antenna.How is the field affected if the sheet is of finite extent?
7 M
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