Q. Diffraction of electromagnetic waves

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Q. When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is

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Q. An antenna has a gain of 44 dB. Assuming that the main beam of the antenna is circular in cross-section the beamwidth will be

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Q. In cellphone communication base antennas are connected to other base antennas in

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Q. The √(L/C) has the dimension of

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Q. The value of VSWR is taken as ∞ when the line is

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Q. The wavelength of an electromagnetic wave after reflection at angle on a surface

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Q. A higher value of Standing Wave Ratio indicates

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Q. An end fire array consisting of several half-wave lengths of directive gain 40, then Find width of major lobe for broadside

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Q. Distilled water at 25°C is characterized by σ = 1.7 x 10¯⁴ mho/m and ε = 78 ε₀ at a frequency of 3 GHz. Its loss tangent is (ε = 10¯⁹/36π F/m)

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Q. The input impedance of short-circuited line of length l where l < λ/4

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Q. If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about

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Q. In a line VSWR of a load is 6 dB. The reflection coefficient will be

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Q. The refractive index of E layer at frequency of √(81N)

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Q. A wavelength of 1 mm could be expected in

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Q. The numerical value of directivity of current element of half-wave dipole is 1.76 and 2.15 dB respectively. The directive gain of half-wave dipole over current element will be

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Q. The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is

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Q. The waveguides compared to equivalent transmission lines at low frequency are

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Q. The current distribution of a half wave dipole is

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Q. Cassergain feed is used with a parabolic reflector to

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