Transcription of CHAPTER 3: ANTENNAS - MIT OpenCourseWare
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97 CHAPTER 3: ANTENNAS ANTENNAS couple propagating electromagnetic waves to and from circuits and devices, typically using wires (treated in Section ) or apertures (treated in Section ). In practice complicated solutions of Maxwell s equations for given boundary conditions are usually not required for system design and analysis because the antenna properties have already been specified by the manufacturer, and must only be understood. Section characterizes these general transmitting and receiving properties of ANTENNAS , which are derived in subsequent BASIC antenna PROPERTIES Most ANTENNAS reversibly link radiation fields to currents flowing in wires at frequencies ranging from sub-audio through
propagation delay of a year or more and the costs of installing the remote station. The receiving properties of antennas are characterized by the antenna affective area A(f,T,I), where the available power at the output of the receiving antenna P r (f) is the product of
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