2.10. In target-search ground-mapping radars it is desirable to have echo power received from a

target, of constant cross section, to be independent of its range. For one such application,

the desirable radiation intensity of the antenna is given by

U(0,4)=

1

0.342 csc(0)

0

{0.34

0° ≤ 0 <20°

20° ≤ 0 < 60°

60° ≤ 0 ≤ 180°

Find the directivity (in dB) using the exact formula.

1 0 5

0° ≤ ≤ 360°