If aperture efficiency is 70%, the directivity D of a parabolic dish antenna as a function of its radius is

\(36{\left( {\frac{r}{\lambda }} \right)^2}\)

\(20{\left( {\frac{r}{\lambda }} \right)^2}\)

\(28{\left( {\frac{r}{\lambda }} \right)^2}\)

\(44{\left( {\frac{r}{\lambda }} \right)^2}\)

If aperture efficiency is 70%, the directivity D of a parabolic dish a

1.	If aperture efficiency is 70%, the directivity D of a parabolic dish antenna as a function of its radius is
A.	\(20{\left( {\frac{r}{\lambda }} \right)^2}\)
B.	\(28{\left( {\frac{r}{\lambda }} \right)^2}\)
C.	\(36{\left( {\frac{r}{\lambda }} \right)^2}\)
D.	\(44{\left( {\frac{r}{\lambda }} \right)^2}\)
Answer» C. \(36{\left( {\frac{r}{\lambda }} \right)^2}\)

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If aperture efficiency is 70%, the directivity D of a parabolic dish antenna as a function of its radius is

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