# If the diameter of a parabolic reflector antenna is 1.3 m, then what will be the half power beamwidth of the antenna? Assume the wavelength of radiation to be 0.2 m.

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If the diameter of a parabolic reflector antenna is 1.3 m, then what will be the half power beamwidth of the antenna? Assume the wavelength of radiation to be 0.2 m.

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Step 1

The half power beamwidth (HPBW) is defined as the angular separation between the two points found on the radiation plot of the antenna with the amplitude of the two points is exactly 0.707 times the amplitude of the maximum radiation intensity.

Now, for a parabolic reflector antenna having an aperture diameter of D, the half power beamwidth (in degrees) can be expressed as

Step 2

In this case, the values of the aperture diameter and the wavelength of radiation is given as

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