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The first-level of the side lobe occurs at ______ dB for a uniform rectangular aperture antenna.

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The first-level of the side lobe occurs at ______ dB for a uniform rectangular aperture antenna.

(a) -13.26

(b) -6.63

(c) 3

(d) 8.5

The question was asked by my school principal while I was bunking the class.

Origin of the question is Radiation from Rectangular Aperture topic in division Aperture Antenna of Antennas

1 Answer

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Right option is (a) -13.26

The explanation: The aperture of antenna at the end determines its shape. If the field is uniform in amplitude and phase along the rectangular aperture then it is called a uniform rectangular aperture antenna. The first side-lobe occurs at -13.26dB.

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