CHAPTER 3: ANTENNAS - MIT OpenCourseWare

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 the far-infrared region.

Then follows from (3.1.9) that: 4 tr tr 22222 min min min GA AA D 1 4r r r SOO (3.1.10) where we have also used (3.1.8). This suggests 2 rDmin O, although in practice we usually require that r2D!O2 in order to use (3.1.9) with confidence, as explained later. Although power is usually the parameter of interest in communications or radar systems,

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