Question

Two dissimilar antennas having thier maximum directivities equal, which of the following statements are right?

• A. must have their effective aperture areas (capture areas) also equal
• B. cannot have their beam widths equal because they are dissimilar antenna
• C. may not necessarily have their maximum power gains equal
• D. must have their beam widths also equal

Answer 1

Answer: (C), (D)

must have their beam widths also equal

Ans : (a & c)

Directivity = $\frac{4\pi }{{\lambda }^2}Ae=\frac{4\pi }{{\Omega }_A}$

${\Omega }_A$ = Beam soild angle

$A_e=$ Capture area

Power gain depends on efficiency and losses, so they may not be equal is right.

Capture areas depend on gain and frequency also