ABSTRACT
The ever-increasing demand of radar, communication, and navigational aids is apparently leading to an overcrowding of the electromagnetic spectrum. To meet this demand, the need for encroaching upon the higher frequencies, extending perhaps into the millimeter-wavelength region of the electromagnetic spectrum, is widely recognized. At such higher frequencies, however, we have to consider the important role where the electromagnetic interaction starts with the neutral atmosphere under various meteorological conditions. This particular phenomenon at frequencies above 10 GHz produces attenuation of the signal, polarization, time delay, etc.
