By Boris Levin
The e-book offers with theoretical and experimental study of antennas. The presentation relies at the electromagnetic conception. It starts with the speculation of skinny antennas. skinny antennas symbolize one of many major kinds of radiators, therefore the idea of skinny antennas is the root of the antennas research.
Special realization is paid to the vital equation of Leontovich-Levin for a present alongside a immediately thin-walled steel cylinder, that is akin to the equation of Hallen with an exact kernel. including the research of assorted kinds of antennas, the publication offers with the issues of synthesis together with the construction a wide-band radiator by way of opting for of the categories and the magnitudes of focused lots, 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 half the ebook, together with the result of program of a repayment strategy for the security of people opposed to irradiation and structural gains of send antennas.
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Extra info for Antenna Engineering : Theory and Problems
The generator of the second radiator must increase the power in the element dV by dP = –EV (J1)J2(V)dV and, accordingly, the power in the entire radiator by L2 P=- Ú E ( J )J (V )dV . V 1 2 -L2 Power P is equal to the power induced by the first radiator in the second radiator, and the ratio of power P to the square of the current of the second generator determines the magnitude of additional impedance, which the first radiator induced in the second radiator: Z21ind 1 =- 2 J 2 (0 ) L2 Ú E ( J )J (V)dV .
In the course of researching the radiator with the impedance, which changes along its length, the issue of rational changing the surface impedance along the antenna with the aim of improving matching of the antenna with a cable arises obligatory. The analysis of the problem shows that at a fixed frequency of the first resonance, the surface impedance must be concentrated at a small antenna segment near the generator. A typical wire antenna with an extending coil in the base meets this requirement.
The expressions presented in this section are given in the accordance with the second formulation of the induced emf method. The formulas, which allow to calculate the mutual impedances of linear radiators for the different variants of their relative geometrical replacement, are collected in . 8 The circuit of radiator p with serial connection of elements. 6 LOSS RESISTANCE IN THE GROUND As already mentioned, the theorem about the oscillating power has significantly changed the understanding of the induced emf method.
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