D = 20 and r = 10 m, f= 6GHz
k = 0.54
λ = 3*10^8/(6*10^9) = 0.05
Now, Antenna gain
GP = 4π*k*A/ λ^2
= 4 π *0.54* π (10)^2/0.05^2
Gp = 851869.4
(Q). A paraboloid reflector antenna with a diameter of 20m is designed to operate at a frequency of 6GHz and illumination efficiency of 0.54. Calculate the antenna gain in decibels.
by 