 MORE IN Antenna and Wave Propagation
SPPU Electronics and Telecom Engineering (Semester 6)
Antenna and Wave Propagation
December 2016
Total marks: --
Total time: --
INSTRUCTIONS
(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
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

More question papers from Antenna and Wave Propagation