Question

In most microwave communication link rain drop attenuation is caused due to

Answer 1

size of rain drop which is measured in millimeter... microwave frequencies are usually interpreted according to its wavelength usually in measure of millimeters (other term for microwave is millimetric wave)... this causes microwave signals be blocked by a rain drop causing the signal to refract or bend in other direction...

Answer 2

... that's why we consider in budget link design the rainfall rate in correlation to rain attenuation...