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. Aperture ANTENNAS that link radiation fields to materials can operate in microwave, infrared, visible, ultraviolet, X-ray, gamma ray, and even higher energy regimes.
the effective area of the receiving antenna in direction T,I and the flux density S(Wm-2Hz-1) incident from that direction; i.e.: > @ 1 r 4 P f Af,, Sf,, Af,, If,, d WHz S TI TI TIxTIx:³ (3.1.5) For our Antares example, the received power would be 10 17 W on Antares if the antenna there had an effective area A(f,T,I) of 104m2 in the direction ...
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