STUPIDSID
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 sin3?. 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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