The two antennas in a bistatic radar are circular, have the same diameter, the same radiation efficiency of 0.97, the s

[answerhappygod]

The two antennas in a bistatic radar are circular, have the same
diameter, the
same radiation efficiency of 0.97, the same aperture efficiency of
0.67, and
operate at wavelength A. = 0.025 m. If P, = 180 kW, L, = 1.24, and
distances
are R1 = 50 km and R2 = 36 km to a target of cross section
(J
= 5.8 m2 ,
what antenna diameter is required to produce a received available
power
Sr = 10- 12 W when channel losses are Lcb1 = 1.8 and Lcb2 = 1.3?
Assume
that both antennas point toward the target.