Download e-book for kindle: Antenna theory and applications by Hubregt J. Visser

By Hubregt J. Visser

ISBN-10: 1119944740

ISBN-13: 9781119944744

ISBN-10: 1119944759

ISBN-13: 9781119944751

ISBN-10: 1119990254

ISBN-13: 9781119990253

This complete textual content on antenna concept explains the beginning of radiation and discusses antenna parameters in-depthThis publication bargains an in-depth insurance of primary antenna idea, and indicates the right way to observe this in perform. the writer discusses electromagnetic radiation and antenna features resembling impedance, radiation development, polarization, achieve and potency. moreover, the ebook presents readers with Read more...

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2012 John Wiley & Sons, Ltd. Published 2012 by John Wiley & Sons, Ltd. 1 Field Regions When talking about radiated fields, we have to take into account the distance relative to the antenna where these fields are evaluated. Close to the antenna, a region exists where energy is stored and returned to the antenna. This region is called the reactive nearfield region of the antenna [2, 3]. Moving away from the antenna, through the reactive near-field region, the next region encountered is called the radiating near-field region or Fresnel region [2, 3].

7 We have assumed that the half-wave dipole has a sinusoidal current distribution over the wire. For the determination of the effective length, a constant current is assumed. 50λ). 42 Antenna Theory and Applications The amount of power intercepted by the receiving antenna, PR , is this power density multiplied by the effective area of the receive antenna, AeR . This effective area is directly related to the gain of the receive antenna, PR = SAeR = GT PT λ2 . 63) After rearranging the terms of this equation, we may relate the power received at the terminals of the receive antenna, PR , to the power delivered at the terminals of the transmit antenna, PT , as PR = PT λ 4πR 2 GR GT .

42 Antenna Theory and Applications The amount of power intercepted by the receiving antenna, PR , is this power density multiplied by the effective area of the receive antenna, AeR . This effective area is directly related to the gain of the receive antenna, PR = SAeR = GT PT λ2 . 63) After rearranging the terms of this equation, we may relate the power received at the terminals of the receive antenna, PR , to the power delivered at the terminals of the transmit antenna, PT , as PR = PT λ 4πR 2 GR GT .

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Antenna theory and applications by Hubregt J. Visser


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