ECE :: Electromagnetic Field Thoery
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A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly
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For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be
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Which one of the following statement is not a correct for a plane wave with
= 0.5e-0.1x cos (106t - 2x)az A/m? -
Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100
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For a transmission line with homogeneous dielectric the capacitance per unit length is 'c', the relative permittivity of the dielectric is 'εr' and velocity of light in free space is 'v' the characteristic impedance z0 is equal to
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The I/P impedance of a short circuited quarter wave long transmission line is
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A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is
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Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60
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(1)2 . 73 
.
.
η = 120
.
and 
.
= 0.
, Re = 1.5 Ω, 
.
