Question
Asked Dec 19, 2019
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If the FNBW of a parabolic reflector antenna is 15o at 1.5 GHz then estimate the diameter of the antenna.

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Expert Answer

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Step 1

For a parabolic reflector type antenna, the expression of First Null Beamwidth (FNBW) in degree can be expressed as

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- > (1) FNBW =140- D 2= Wavelength of radiation D = Diameter of the parabolic dish

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Step 2

If f Hz is the given frequency of transmission or reception by an antenna, then the corresponding wavelength can be expressed as

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3x10°

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Step 3

In this case, the values of the frequency of radiation and the first null beamwidth are given as

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f =1.5 GHz FNBW =15°

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