Transcription of CHAPTER 3: ANTENNAS - MIT OpenCourseWare
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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.
expression for this coupling coefficient results if we define the useful concept of beam solid angle:A so that : oA r 4 G G d 4 S ': ³: SK (3.1.15) where this relation between G(T,I) and :A is suggested by Figure 3.1-4(a). The beam solid angle :A (steradians) usually approximates the solid angle contained within the antenna beam’s half-power ...
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