Question

Dolph pattern uses which of the following polynomial approximation?

(a) Chebyshev

(b) Binomial

(c) Pascal’s

(d) Taylor

The question was posed to me in an online interview.

This intriguing question originated from Adaptive Array topic in division Phased, Adaptive and Binomial Arrays of Antennas

Answer 1

Correct option is (a) Chebyshev

To elaborate: An array with desired side lobes can be designed by using the Dolph-chebyshev method. This method uses the approximation of the Chebyshev polynomials. Binomial array uses the Pascal’s triangle for amplitude excitations.