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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.

coupling radiation to wires or waveguides is often called “quasi-optics”. For the most part, all of these systems can be characterized by the definitions that follow. A transmitter with available power PT will radiate PTR, where the antenna radiation efficiency PP 1TR T ' K d, and typically is close to unity for most antennas. Ideally, this ...

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Transcription of CHAPTER 3: ANTENNAS - MIT OpenCourseWare

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