Answer any one question from Q1 and Q2

1 (a)
What is polarization of wave? Explain the polarization of three types of wave with the help of relevant diagram?

8 M

1 (b)
Write a short note on

i) Ionospheric abnormalities

ii) Multihop propagation

i) Ionospheric abnormalities

ii) Multihop propagation

6 M

1 (c)
A lossless resonant λ/2 dipole antenna with input impedance of 73Ω is to be connected to a transmission line whose characteristic impedance is 50Ω. Assuming that the pattern the antenna is given approximately by U = Bo sin

^{3}?. Find the overall maximum gain of this antenna.
6 M

2 (a)
What is Poynting vector? What is its significance? Derive an expression for Poynting vector?

6 M

2 (b)
Explain antenna radiation mechanism in detail.

6 M

2 (c)
Calculate the mean excess delay, RMS delay spread, and the maximum excess delay (10dB) for the multipath profile given in the figure below. Estimate the 50% coherence bandwidth of the channel.

8 M

Answer any one question from Q3 and Q4

3 (a)
Derive the expression for radiation resistance of Infinitesimal Dipole.

9 M

3 (b)
Derive the expression for radiation resistance of small dipole antenna.

9 M

4 (a)
Calculate the radiation resistance of a double turn and an eight turn small circular loop when radius of loop is λ/10 and the medium is free spACe. Calculate its efficiency if loss resistance is 25Ω.

8 M

4 (b)
Derive mathematical expression for power density and radiation intensity of half wave dipole antenna and draw radiation pattern of half wave dipole antenna in E and H plane.

10 M

Answer any one question from Q5 and Q6

5 (a)
Write a short notes on

i) Pattern Multiplication.

ii) Binomial Array.

i) Pattern Multiplication.

ii) Binomial Array.

8 M

5 (b)
Design a broad side Dolph-Tschebhysheff array of five elements with half wavelength spACing between elements and with major to minor lobe ratio to be 19dB. Find the excitation coefficients & array fACtor.

8 M

6 (a)
Explain planar array. State its advantages and applications.

6 M

6 (b)
An Endfire array with element spACed at λ/2 and with axes of elements at right angles to the line of array is required to have directivity of 36. Determine -the array length and the width of major lobe.

5 M

6 (c)
Give the comparison of broadside and End fire antenna array.

5 M

Answer any one question from Q7 and Q8

7 (a)
Give structure details, radiation pattern, specification and application of Super-turnstile Antenna.

5 M

7 (b)
What is meant by Rhombic Antenna? Explain its construction and operating principle.

5 M

7 (c)
Write a short notes on following antennas with respect to structural details, radiation pattern features and applications.

i) Hertz antenna

ii) Lens Antenna

i) Hertz antenna

ii) Lens Antenna

6 M

8 (a)
Write short notes on the following antennas.

i) Whip antenna

ii) Slot Antenna

iii) Microstrip patch antenna

i) Whip antenna

ii) Slot Antenna

iii) Microstrip patch antenna

12 M

8 (b)
A paraboloidal reflector antenna with diameter 20m is designed to operate at frequency of 6 GHz and illumination efficiency of 0.54. calculate the antenna gain in decibels.

4 M

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