By Boris Levin
The booklet offers with theoretical and experimental study of antennas. The presentation is predicated at the electromagnetic conception. It starts with the idea of skinny antennas. skinny antennas signify one of many major varieties of radiators, therefore the idea of skinny antennas is the root of the antennas research.
Special awareness is paid to the vital equation of Leontovich-Levin for a present alongside a instantly thin-walled steel cylinder, that is comparable to the equation of Hallen with an exact kernel. including the research of assorted sorts of antennas, the booklet bargains with the issues of synthesis together with the production a wide-band radiator by way of identifying of the categories and the magnitudes of centred a lot, that are hooked up alongside a linear radiator and create in a given frequency band excessive electric functionality.
Problems of antenna engineering are mentioned within the moment 1/2 the ebook, together with the result of program of a repayment procedure for the safety of people opposed to irradiation and structural gains of send antennas.
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Additional info for Antenna Engineering : Theory and Problems
76) Theory of Thin Antennas 21 Hence the integrand is 2 Hj 0 r = J 2 (0 ) È1 + cos 2 kL - 2 cos kL cos k 4p r sin 2 kL ÎÍ 2 ( ) r 2 + L2 - r ˘ . ˚˙ If b2 b1 L, the integral b2 Ú 2 Hj 0 r d r = b1 b J 2 (0)(1 - cos kL)2 In 2 2 2 b1 4p sin kL increases unlimitedly with increasing of the upper limit and, consequently, the resistance Rg increases unlimitedly also. 75) is equal to l/2. Outside the boundaries of this area the component of zonal current, which decreases with increasing distance in accordance with the law 1/r, is dominated.
E. Zg = 1 J 2 (0 ) Ú (Sg ) • 2p ÈE , H ˘ dSg = - 2 Er Hj r d r. 82) 0 Here, Er and Hj are the field components on the surface of a highly conducting ground. 77) only by substitution Hj for Hj0. 82), it is necessary to include in the integrand the field of not perfectly conducting, but of the real ground. Since J(z) is the current of the real antenna, which like the input impedance is distinguished from the current along the antenna mounted on a perfectly conducting ground, then Hj is the magnetic field on the surface of the ground, which has a finite conductivity.
Thus the theorem about the oscillating power allowed not only to obtain simply and clearly the result derived by means of an intricate procedure, but enabled to discover the mistake . 83) where Z0 is the surface impedance. Here, the minus sign is caused by the fact that the current density j = [n, H ] is directed radially toward the origin along the ground. e. 84) • ÚH 2 j r d r.. 86) a where Hj1 = ReHj , Hj2 = ImHj . 75). e. 86) converges. 75) with an upper limit equal to infinity can be obtained on the basis of the 24 Antenna Engineering: Theory and Problems theorem about the complex power.