Q. The ratio of the directivity of an end fire antenna to that of a broadside antenna is

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Q. If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by E(z, t) = 10 cos (2π x 10⁷t - 0.1 πz) volt/metre, then the velocity of the travelling wave is

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Q. The absorption of radio waves by atmosphere depends on

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Q. For transmission-line matching over range of frequencies, it is best to use a

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Q. For a reflection co-efficient of 0.5, the value of SWR is

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Q. A rectangular waveguide having TE₁₀ mode as dominant mode is having a cut off frequency of 18 GHz for the TE₃₀ mode. The inner broad wall dimension of the rectangular waveguide is

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Q. A 50 π characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be

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Q. 1 dB is equal to __________ nepier

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Q. ∇. J̅ = 0 is frequently known as

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Q. A rhombic antenna is a

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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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