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Download e-book for kindle: Antenna Engineering : Theory and Problems by Boris Levin

By Boris Levin

ISBN-10: 1498759203

ISBN-13: 9781498759205

ISBN-10: 1498759211

ISBN-13: 9781498759212

The publication bargains with theoretical and experimental learn of antennas. The presentation relies at the electromagnetic idea. It starts with the idea of skinny antennas. skinny antennas characterize one of many major kinds of radiators, hence the idea of skinny antennas is the foundation of the antennas research.

Special recognition is paid to the quintessential equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that is comparable to the equation of Hallen with an actual kernel. including the research of assorted varieties of antennas, the publication offers with the issues of synthesis together with the construction a wide-band radiator through picking out of the kinds and the magnitudes of targeted lots, 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 program of a repayment approach for the safety of people opposed to irradiation and structural beneficial properties of send antennas.

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Example text

23), c c J22 (0) = j 60 cos a 2 L Ú E ( cJ )sin k (L - V ) dV . e. identical to the second formulation of the method of induced electromotive force. Thus, when J1   Ŭ  VJG KPVGITCN HQTOWNC HQT VJG FKRQNG KPRWV KORGFCPEG FGTKXGF by the method of emf coincides with the integral formula obtained as a result of solving integral equation of Leontovich-Levin. The identity of integral formulas explains the known fact of coincidence of input impedances (in the second approximation) calculated by the two methods and expressed in terms of tabulated functions.

It is assumed that the magnitude s is equal to 3 Sm/m. Dimensions are given in meters. 90). 12 Loss resistance in water for a radiator with shifted feed point. The considered example shows that the theorem about the oscillating power changes significantly the understanding of the processes related with the transfer of power between the objects. 1 INTEGRAL EQUATION FOR LINEAR METAL RADIATOR As shown in Chapter 1, knowledge of the current distribution along a linear radiator allows to determine the electromagnetic field and all electrical characteristics of the radiator.

40) for the radiator excited by concentrated emf KI(z) = eId(z), its current in the first approximation in the presence of the second radiator also has a sinusoidal nature: c1 JI 1 ( z) = j c1 eI sin k ( L1 - z ). 42) sin k ( L1 - z ) W È c1n -1 JI , n -1 + Es c 2n -1 JII , n -1 ˘ sin k(L1 + s )ds ˝ . e. Ê n m ˆ Ê n -1 m ˆ Ez Á c1 JI , m ˜ = - K1 ( z) - Ez Á c2 JII , m ˜ + W c1n JIn . 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.

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Antenna Engineering : Theory and Problems by Boris Levin

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