Question

The principle plane pattern of the E-plane of rectangular aperture of a×b is given by F(θ) = ______

(a) \(\frac{sin⁡(0.5kbsin \theta)}{0.5kbsin \theta}\)

(b) \(\frac{cos⁡(0.5kbcos \theta)}{0.5kbsin \theta}\)

(c) \(\frac{sec⁡(0.5kbsin \theta)}{0.5kbsin \theta}\)

(d) \(\frac{1-sin⁡(0.5kbsin \theta)}{0.5kbsin \theta}\)

Answer 1

Correct choice is (a) \(\frac{sin⁡(0.5kbsin \theta)}{0.5kbsin \theta}\)

Explanation: The principle plane patterns for the uniform rectangular aperture antenna is given by

F(θ) = \(\frac{sin⁡(0.5kbsin \theta)}{0.5kbsin \theta}\) and main lobe occurs when θ =0.