By Hubregt J. Visser
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 the mandatory instruments for studying advanced antennas and for designing new ones. additionally, a refresher bankruptcy on vector algebra, together with gradient, divergence and curl operation is integrated. in the course of the e-book abundant examples of making use of the derived thought are given and all chapters are concluded with difficulties, giving the reader the chance to check his/her bought knowledge. Read more...
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Additional resources for Antenna theory and applications
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 .
Antenna theory and applications by Hubregt J. Visser