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a) What is the difference between Beam-Width and First Null Beam-Width? b) A 70% efficient antenna is...

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Physics

a) What is the difference between Beam-Width and First NullBeam-Width?

b) A 70% efficient antenna is having a radiation resistance (Rr)and loss resistance (RL). Calculate the ratio between (Rr) and(RL).

c) Calculate the maximum effective aperture of an antennaoperating at a wavelength of 0.5m and has a directivity of 250.

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