By Boris Levin
The publication bargains with theoretical and experimental examine of antennas. The presentation is predicated at the electromagnetic conception. It starts off with the speculation of skinny antennas. skinny antennas characterize one of many major forms of radiators, therefore the speculation of skinny antennas is the root of the antennas research.
Special recognition is paid to the crucial equation of Leontovich-Levin for a present alongside a instantly thin-walled steel cylinder, that is akin to the equation of Hallen with an exact kernel. including the research of varied sorts of antennas, the e-book offers with the issues of synthesis together with the production a wide-band radiator by way of picking 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 1/2 the publication, 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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Additional resources for Antenna Engineering : Theory and Problems
50) not only the denominator other, but also another current distribution J(z) along the radiator and another field Ez( J) of its current. 50) instead of Ez( J) one should substitute the difference [Ez( J) – Hj Z(z)]. e. the impedance of the square surface section. Actually, in accordance with the boundary condition on the radiator surface, it is necessary to take into account that a voltage drop along the self radiator makes no contribution to its radiation. 5a) in a shape of a straight circular cylinder with radius a we find 1 ZA = - 2 J ( h) L Ú [E ( J ) - ZJ(z)/(2pa)] J(z)dz.
1) Here the cylindrical coordinate system is used. a and L are the radius and the arm length of a dipole, respectively, K(z) is an extraneous emf. Current at the radiator ends is absent: J(± L) = 0. 1) is the mathematical record of the fact that the full field, which is a sum of the extraneous field and the current field, is zero on the surface of a perfectly conducting radiator. The extraneous field is specified usually as the product of potential difference e between the edges of the gap and d-function.
41) as the first term. It is interesting to compare the results of solving Leontovich-Levin equation for one and two radiators with solutions obtained by the induced emf method. 45) Â ( n -1) II )˘˚ J (1) I (s)ds . Here for simplicity the following designation is used for the current of first radiator in the approximation n: n JI(n) ( z) = Âc m =1 m 1 JIm . 40 Antenna Engineering: Theory and Problems The input impedance in the approximation n is equal to eI ( n -1) JI (0 ) + J (AIn) = c1n JIn (0) .