STUPIDSID
1 (a)
Define the following terms with respect to antenna:
i) Directivity
ii) Beam solid angle
iii) Radiation resistance
i) Directivity
ii) Beam solid angle
iii) Radiation resistance
9 M
1 (b)
State and prove Friis transmission formula.
5 M
1 (c)
Show that maximum effective aperture of short dipole is 0.119 λ2.
6 M
2 (a)
State and prove power theorem and its application.
5 M
2 (b)
Show that the directivity for unidirectional operation is 2(n+1) for an intensity variation of U-Umcosnθ.
5 M
2 (c)
Derive an expression and draw the field pattern for isotropic point source of the same amplitude and same phase.
10 M
3 (a)
Starting from electric and magnetic potentials, obtain the far field components for a short dipole.
12 M
3 (b)
Derive an expression for radiation resistance of a short electric dipole.
8 M
4 (a)
Derive an expression for far field components of a loop antenna.
10 M
4 (b)
The radius of a circle loop antenna is 0.02λ. How many turns of the antenna will give a radiation resistance of 35Ω.
5 M
4 (c)
Write a note on slot antenna.
5 M
5 (a)
Explain the features of an helical antenna and the practical design considerations of the helical antenna.
10 M
5 (b)
Write note on: i) Ultra wide band antenna,
ii) Lens antenna.
ii) Lens antenna.
10 M
6 (a)
Explain: i) Yagi-Uda antenna, ii) Parabola reflectors
10 M
6 (b)
Write short notes on:
i) Turnstile antenna
ii) Antennas for ground penetrating radar.
i) Turnstile antenna
ii) Antennas for ground penetrating radar.
10 M
7 (a)
Discuss the propagation characteristics of radio waves for different frequencies.
10 M
7 (b)
Explain the principle of surface wave propagation. Obtain an equation for tilt angle α of the wave.
10 M
8 (a)
Draw and explain different ionized layers an ionospheric propagation.
10 M
8 (b)
A distance of 1500 km one is to be covered along earth surface using a communication link of the reflection region of ionosphere has fc 6MHz and fMUF 7.5 MHz, calculate the height of the region.
5 M
8 (c)
Write a note on skip distance.
5 M
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