Abstract
Multipath fading is one of the most serious events which can interrupt service on microwave communication systems. This is caused by irregularities in the refractive index of the atmosphere which cause the microwave signal to be refracted upwards or downwards such that two or more separate wave components may travel to the receiver over slightly different paths. These components reinforce or cancel each other depending on the phase difference of the independent paths. The irregularities in the refractive index of the atmosphere determine the earth's equivalent radius k. This factor k is thus of critical importance in microwave engineering. However, detailed data on k are not available for India.An attempt has been made in this paper to present a detailed picture of the factor k, by evaluating its diurnal variations over different regions of India. It has been observed that India can be divided into three distinct zones each with its distinct pattern of k factor variation, namely inland stations in the con...
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