�
Range is limited due to curvature of earth . If h be the height of the transmitting antenna , then signal can be received upto a maximum distance
d = √2RH
�
If height of transmitting and receiving antennas be h T and h R respectively . The effective range will
Microwave Propagation
� Microwaves are electromagnetic wave of frequency 1 to 300 GHz , greater than those of TV signals . The wavelength of microwaves is of the order of a few mm .
� Microwave communication is used in radar to locate the flying objects In space .
� These waves can be transmitted as beam signals in a particular direction , much better than radiowave ,
� There is no diffraction of microwave around corners of an obstacle which happens to lie along its passage .
Satellite Communication
It IS carried out between a transmitter and a receiver through a satellite . A geostationary satellite is utilized for this purpose , whose time period is 24 hours .