By Boris Levin
The ebook bargains with theoretical and experimental learn of antennas. The presentation relies at the electromagnetic concept. It starts with the speculation of skinny antennas. skinny antennas symbolize one of many major kinds of radiators, hence the speculation of skinny antennas is the root of the antennas research.
Special realization is paid to the quintessential equation of Leontovich-Levin for a present alongside a instantly thin-walled steel cylinder, that is corresponding to the equation of Hallen with an actual kernel. including the research of assorted different types of antennas, the publication bargains with the issues of synthesis together with the production a wide-band radiator via opting for of the categories and the magnitudes of centred so much, 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 ebook, together with the result of software of a reimbursement technique for the security of people opposed to irradiation and structural gains of send antennas.
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Additional resources for Antenna Engineering : Theory and Problems
The solution uses magnitude W = 2 ln(2L/a) = 1/c as the parameter, in inverse powers of which function J(z) is expanded into a series. 7) ◊ 60W cos kL + B1 (L)/ W + B2 (L)/ W 2 + … B1 (L) ˘ e e È N ( z) sin k(L - z ), J1H ( z) = j Í 1 ˙ . Functions Ni(z) 60 cos kL 60 Î cos kL sin k(L - z ) ˚ and Bi(z) are integrals, which can be expressed in terms of integral sine and cosine. The iterative procedure proposed by King and Middleton  yields more accurate results. 7), but expansion parameter W is replaced with Y.
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. 58) 16 Antenna Engineering: Theory and Problems If h = 0, the current distribution J(z) coincides in the first approximation with the current distribution along an impedance long line, open at the end: J( z) = J(0)sin k1 ( L - z )/sin k1 L .
CPF C FGTKXCVKXG QH Zg with respect to h, is positive always. In the general case F1 and F2 have a more complicated character . 12. 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.
Antenna Engineering : Theory and Problems by Boris Levin