CHAPTER 3: ANTENNAS - MIT OpenCourseWare
97CHAPTER 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.
The system designer maximizing Pr might be tempted to let the separation r between the two antennas approach zero, which would suggest received powers approaching infinity. The solution to this paradox is that the distance r must be greater than some minimum for (3.1.9) to be valid.
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