By Boris Levin
The ebook offers with theoretical and experimental learn of antennas. The presentation is predicated at the electromagnetic concept. It starts with the speculation of skinny antennas. skinny antennas characterize one of many major kinds of radiators, therefore the speculation of skinny antennas is the foundation of the antennas research.
Special realization is paid to the crucial equation of Leontovich-Levin for a present alongside a instantly thin-walled steel cylinder, that's similar to the equation of Hallen with an exact kernel. including the research of varied varieties of antennas, the publication bargains with the issues of synthesis together with the production a wide-band radiator through deciding upon of the categories and the magnitudes of centred rather a lot, that are attached 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 e-book, together with the result of software of a repayment procedure for the safety of people opposed to irradiation and structural good points of send antennas.
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Extra info for Antenna Engineering : Theory and Problems
The above-mentioned conditions allow expressing the amplitude and phase of the current at any segment through the amplitude and phase of the current of preceding segment, and, therefore, through segments’ parameters and one of the currents. The current distribution along the entire radiator coincides in the first approximation with current distribution along a stepped long line open at the end. 61). e. 60), obtained by the induced emf method, is generalized. 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.
E. it varies with the frequency. Such parameters adopted for ease of comparison of the input impedance with results of other authors collected in . 1 as the results of solving equation of Leontovich-Levin. The methods used by different authors at different times have been seriously substantiated. The equation of Leontovich-Levin is the most rigorous variant among 36 Antenna Engineering: Theory and Problems integral equations of the theory of thin antennas. Unfortunately, for a long time it was in the shadow of other well-known equations.
This circumstance simplifies essentially the calculation based on the recurrent formulas. 20) allows to calculate the second approximation for the input current. 17) at a point z = 0 is equal to e c tan a . 20) at this point is L c2 J 2 ( 0 ) = j c sin a ÈÎK (V ) + EV ( cJ1 )˘˚ sin k ( L - V ) dV = c2 J21 (0) + c2 J22 (0). 22) 30 sin 2a Ú -L This value consists of two summands corresponding to two elements in square brackets. It is seen that the first summand is equal to cJ1(0). e. ZA0 is the known expression for the input impedance of the dipole, which was obtained by method of induced emf (second formulation).
Antenna Engineering : Theory and Problems by Boris Levin
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