STUPIDSID
Answer the following any four:
1 (a)
What do you understand by conservative field.
5 M
1 (b)
Derive wave equations for time harmonic fields.
5 M
1 (c)
The radiation resistance of antenna is 72Ω and the loss resistance is 8Ω. Calculate its directivity in dB if the power gain is 16.
5 M
1 (d)
Explain the important advantages and drawback of FDM.
5 M
1 (e)
Define critical frequency, MUF and OWF.
5 M
2 (a)
State and Explain Maxwell's equations in differential and internal form for static field.
8 M
2 (b)
A 10 GHz plane wave traveling in free space has an amplitude of Ex=10V/m. Find
i) The phase constant
ii) Intrinsic impedance and
iii) The amplitude and the direction of H.
i) The phase constant
ii) Intrinsic impedance and
iii) The amplitude and the direction of H.
8 M
2 (c)
Explain the operating modes of helical antennas.
4 M
3 (a)
Explain the mechanism of ionospheric propagation. A high frequency radio link has to be established between two points at a distance of 2000 km. On the earth's surface. Considering the height of 200km and critical frequency of 5MHz. Calculate MUF for given path.
8 M
3 (b)
Derive an expression for radiation resistance of an infinitesimal dipole antenna and explain its significance.
8 M
3 (c)
Derive Laplace's and Poisson's equations.
4 M
4 (a)
Find the transmission and reflection coefficients at the boundary for normal incidence. Given that for region 1:?r1=1, &insin;r1=9 and for region 2 is a free space. Consider the perpendicular polarization.
8 M
4 (b)
Derive an expression for vector magnetic potential wave equation.
8 M
4 (c)
Explain the physical significance of the terms α, β and γ related to wave propagation in lossy dielectrics.
4 M
5 (a)
Give the comparison of FDM, FEM and MOM.
8 M
5 (b)
Determine the poynting vector and explain the power flow terms due to the time varying fields.
8 M
5 (c)
The height of monopole antenna is ?/100 what is the radiation resistance.
4 M
Write a short notes on:-
6 (a)
Boundary conditions for static E and M fields.
5 M
6 (b)
Polarization of waves.
5 M
6 (c)
Antenna parameters.
5 M
6 (d)
Space wave propagation.
5 M
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