Transmitting and Receiving Antenna
a) Radio or wireless communication link with transmitting antenna
b) Receiving antenna. The receiving antenna is remote远程 from the transmitting antenna so that the spherical wave radiated by the transmitting antenna arrives as an essentially本来 plane wave at the receiving antenna.
Schematic representation of region of space at temperature T linked via a virtual transmission line to an antenna.
It’s to be noted that the radiation resistance, the antenna T, and the radiation pattern are functions of the frequency. In general, the patterns are also functions of the distance at which they are measured, but at distances which are large compared to the size of the antenna and large compared to the wavelength, the pattern is independent of distance. Usually the patterns of interest are for this far-field condition.
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