It is a fundamental property of antennas that the electrical characteristics of an antenna described in the next section, such as gain, radiation pattern, impedance, bandwidth, resonant frequency and polarization, are the same whether the antenna is transmitting or receiving. For example, the "receiving pattern" (sensitivity as a function of direction) of an antenna when used for reception is identical to the radiation pattern of the antenna when it is driven and functions as a radiator. This is a consequence of the reciprocity theorem of electromagnetics. Therefore, in discussions of antenna properties no distinction is usually made between receiving and transmitting terminology, and the antenna can be viewed as either transmitting or receiving, whichever is more convenient. COUNT 4
QSN1 Are essential properties of an antenna changed based on what fungtion they are performing ANS1 the same QSN2 What proposition explains the equivalency of the recieving pattern of an antenna? ANS2 reciprocity theorem of electromagnetics QSN3 Can the antenna serve more than one fungtion at a time? ANS3 either transmitting or receiving QSN4 What is one electrical trait of an antenna? ANS4 radiation pattern