By Hubregt J. Visser
This accomplished textual content on antenna thought explains the foundation of radiation and discusses antenna parameters in-depthThis booklet bargains an in-depth insurance of primary antenna concept, and indicates how one can practice this in perform. the writer discusses electromagnetic radiation and antenna features comparable to impedance, radiation development, polarization, achieve and potency. furthermore, the publication offers readers with the required instruments for studying complicated antennas and for designing new ones. in addition, a refresher bankruptcy on vector algebra, together with gradient, divergence and curl operation is incorporated. through the publication considerable examples of using the derived conception are given and all chapters are concluded with difficulties, giving the reader the chance to check his/her got knowledge. Read more...
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Additional resources for Antenna theory and applications
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]. The radiating near-ﬁeld region is characterized by the fact that the radiation ﬁelds dominate the reactive ﬁelds and that the angular distribution of this radiated ﬁeld is dependent on the distance from the antenna.
24(b). We call this circular polarization state right-hand circular polarization (RHCP), following the direction of a right-handed screw. 24 Circular polarization. (a) Left-hand circular polarization (LHCP). (b) Right-hand circular polarization (RHCP). 22(c). The axial ratio (AR) is inﬁnite for a linearly polarized wave. 4 Axial Ratio The axial ratio of a perfect circularly polarized wave is equal to unity. In practice, perfect circular polarization is seldom encountered; a certain amount of ellipticity will always exist.
In a communication system, we have to deal with at least two antennas: a transmitting antenna and a receiving antenna. 27. The gain of the transmitting antenna is GT , the gain of the receiving antenna is GR . 62) 4πR 2 where PT is the input power at the terminals of the transmitting antenna. The factor 1/(4πR 2 ) accounts for the spherical spreading of the energy. Since the transmit antenna is non-isotropic, this factor is multiplied by the gain of the antenna. 27 Communication system consisting of a transmitter having an antenna with gain GT and a receiver having an antenna with gain GR .