This set of Antennas Multiple Choice Questions & Answers (MCQs) focuses on “Adaptive Array – Chebyshev Arrays”.
1. Which of the following is the key feature of the Chebyshev array?
a) Have constant side lobes and elements are placed uniformly
b) Have varying side lobes and elements are placed uniformly
c) Minor lobes are present at |x| > 1
d) Major lobes are present at |x| < 1
View Answer
Explanation: Chebyshev array exhibits the properties of the Chebyshev polynomial having constant amplitude 1-≤x≤1. Minor lobes are present at |x| < 1 andMajor lobes are present at |x| > 1.
2. In Chebyshev array, its array factor is approximated to Chebyshev polynomial.
a) True
b) False
View Answer
Explanation: One of the properties exhibited by the Chebyshev array is having a constant amplitude range of 1-≤x≤1. Its array factor is approximated to Chebyshev polynomial. This array has constant side lobes and elements are placed uniformly.
3. _____________ is used to obtain array with any desired side lobe level.
a) Chebyshev
b) Schelkunoff
c) Woodward-Lawson
d) Binomial
View Answer
Explanation: Chebyshev technique is used to obtain array with any desired side lobe level. In Schelkunoff method, pattern is produced with null in specified directions. Woodward method is suited for beam shaping. Binomial array is used when no side lobes are desired.
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