Antenna Engineering : Theory and Problems by Boris Levin

By Boris Levin

The e-book offers with theoretical and experimental study of antennas. The presentation relies at the electromagnetic idea. It starts with the idea of skinny antennas. skinny antennas signify one of many major different types of radiators, hence the idea of skinny antennas is the root of the antennas research.

Special cognizance is paid to the critical equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that's resembling the equation of Hallen with an actual kernel. including the research of assorted forms of antennas, the publication offers with the issues of synthesis together with the production a wide-band radiator through opting for of the categories and the magnitudes of focused quite a bit, 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 e-book, together with the result of software of a repayment process for the safety of people opposed to irradiation and structural beneficial properties of send antennas.

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Sample text

The sum of the currents of both wires. 7b, is an example of a radiator consisting of wires with different lengths. The antenna contains the central radiator with complex load Z1 and side radiators situated around it and connected with it at the base. 65). The current distribution along the antenna wires is found by means of the theory of electrically coupled lines. 7c) consists of three wires. The first wire is equivalent to the central radiator, the second wire is equivalent to the system of identical side radiators, and the third wire is the ground.

42), we find the member n of the series for current. In particular, if n = 2, c 12 JI 2 ( z) L1 Ï c1 Ô =j Ìsin k(L1 + z) [ K I (s) + Es ( c1 JI 1 ) + Es ( c2 JII 1 )] sin k(L1 - s) ds + 30 sin 2 kL1 Ô z Ó Ú ¸ Ô. 44) allows finding the second term of the series for the current at any point of the first radiator. 44), it is necessary to calculate the fields of the currents in the first approximation. 44), it is see also, as a matter of course, that the magnitude of the second term of the series depends on the geometric dimensions of the second radiator and on the relative position of radiators.

Losses in the ground do not affect the radiation resistance. 79) is equal to PII = P1 + P2 + P3 + 2 jwW . 81) Ú (m H 2 ) + e E 2 dV are V total powers of the radiation, of the losses in the wires, of the losses in the ground, as well as the oscillating energy in the volume V. 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.

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