SPPU Electronics and Telecom Engineering (Semester 6)
Antenna and Wave Propagation
December 2016
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any one question from Q.1(a,b,c) & Q.2(a,b,c)
1(a) A plane wave of 200MHz travelling in free space impinges normally on a large block of material having \[\varepsilon r=4,\mur =9 \text{and}\sigma =0,\text{determine}\\\eta _1,\eta _2,\beta _1, \beta _2,\Gamma_T\text{and}\Gamma_R.\]
8 M
1(b) Explain the field regions surrounded by an antenna.
6 M
1(c) Explain the following chracteristics of wireless channel
i) coherence band width
ii) coherence time and
iii) fading
6 M

2(a) What is polarization of wave. Explain linear and circular polarization of wave.
6 M
2(b) Derive the fundamental equation of free space propagation. Also explain the spatial loss in detail.
8 M
2(c) Calculate the maximum effective aperture of a lossless horn antenna operating at 10GHz with a directivity of 20db. Also find maximum power received when incident power density is 2×10-3(W/m2).
6 M

Solve any one question from Q.3(a,b) & Q.4(a,b,c)
3(a) Derive the equation for input imped dance and directivity of half wave dipole.
8 M
3(b) Give the comparison of far fields of small loop and short dipole.
8 M

4(a) What do you meant by loop antennas; give the classification of loop antennas explain the properties of electrically small loop antenna.
6 M
4(b) A 1m long car radio antenna operates in the AM frequency of 2MHz. How much current is required to transmit 4 watts of power?
4 M
4(c) Show the current distribution on small dipole and derive the equation for its input impedance.
6 M

Solve any one question from Q.5(a,b,c) & Q.6(a,b)
5(a) Explain in detail the working principle of broadside array.
6 M
5(b) Derive antenna array factor for N-element linear array taking the centre element as reference for N is odd and even.
4 M
5(c) With the help of suitable diagram explain the principle of pattern multiplication.
4 M

6(a) Draw and explain the radiation pattern of an end fire array.
8 M
6(b) Design of broadside Dolph-Tchbyschev array of 10 elements with half wave spacing(d) between the elements and with a major to minor lobe ratio of 26dB. Calculate the excitation coefficient.
8 M

Solve any one question from Q.7 & Q.8(a,b)
7 Explain the following antennas with its structural details dimensions, radiation pattern, diagram, specifications, features, and applications.
a) Microstrip antenna
b) Slot antenna
c) Super turnsile antenna
18 M

8(a) With the help of suitable diagram explain the operating principle of
i) Bisconical antenna
ii)Lens antenna
10 M
8(b) Explain the Rhombic antenna in detail.
8 M

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