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In Chebyshev array which of the following is approximated to the Chebyshev polynomial?

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In Chebyshev array which of the following is approximated to the Chebyshev polynomial?

(a) Array factor

(b) HPBW

(c) Side lobe level

(d) Range equation

I had been asked this question in unit test.

My question is from Adaptive Array in portion Phased, Adaptive and Binomial Arrays of Antennas

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Right answer is (a) Array factor

Easiest explanation: The array factor is approximated to the Chebyshev polynomial and the desired side lobe level is maintained similar to the polynomial where constant amplitude is maintained between -1 to 1. Dolph- chebyshev method is used to design array with desired side lobes.

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