Q. The cut off wavelength λc for TE₂₀ mode for a standard rectangles waveguide is

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Q. F2 layer of atmosphere extends from

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Q. Whereas resonant antenna is bidirectional, non-resonant antenna is unidirectional.

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Q. In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

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Q. Which of the following antennas is λ /4 length?

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Q. The number of lobes on each side of a 31 resonant antenna will be

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Q. Analysis of EM wave in waveguide based on

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Q. The main difference between the broadside arrays and end fire arrays is that

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Q. The charges between a hollow and solid metal spheres reside

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Q. Maximum usable frequency is [fmuf]

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Q. The magnetic field due to current I equals

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Q. VLF is generally used for

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Q. In electromagnetic wave polarization is caused by

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Q. In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

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Q. Isotropic radiator is one that radiates energy

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Q. Refraction of electromagnetic waves occurs when they

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Q. The impedance inversion may be objected with

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Q. An electromagnetic wave incidents on a perfect insulator at an angle. If the wave is not entirely parallel polarized, then

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Q. Coaxial cables can be used for which frequency?

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Q. An antenna couple is used due to all of the following reasons except

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