By Boris Levin

ISBN-10: 1498759203

ISBN-13: 9781498759205

ISBN-10: 1498759211

ISBN-13: 9781498759212

The e-book offers with theoretical and experimental study of antennas. The presentation relies at the electromagnetic concept. It starts off with the idea of skinny antennas. skinny antennas symbolize 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 imperative equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that's corresponding to the equation of Hallen with an exact kernel. including the research of assorted kinds of antennas, the ebook bargains with the issues of synthesis together with the construction a wide-band radiator by way of picking out of the categories and the magnitudes of focused 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 e-book, together with the result of software of a reimbursement approach for the safety of people opposed to irradiation and structural good points of send antennas.

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**Additional info for Antenna Engineering : Theory and Problems**

**Sample text**

5 /ln(2 L / ae ). 12), we obtain the desired equation È ˘ d2 J d 2V 2 + = 4 + + k 2V ˙ . 14) This equation together with the components, which contain the extraneous emf, the current and the current derivative, also has the element incorporating the integral V( J, z) and its derivative. It is known that one concentrated emf cannot create the sinusoidal current along the dipole [29]. The mentioned element is the additional emf, which depends on the current of the antenna. This emf is distributed along the antenna and takes the radiation into account.

68) where R0 = a 2 + z 2 , Rm1 = a 2 + (lm - z)2 , Rm 2 = a 2 (lm + z)2 ; a is the radiator radius at point z, and dJ(lm + 0)/dz and dJ(lm – 0)/dz are the values of derivative on the right and on the left of point z = lm. 3, the induced emf method does not permit to obtain the finite values of the input impedance at the points of parallel resonance, where J(h) = 0, and near these points. The second (integral) variant of solving the LeontovichLevin integral equation allows in the case of the symmetrical radiator, if J(h ū VQ come to the expression e ZA = L È ˘.

J ( z) = Ì Ó J(0)sin k(L - z)/sin k(L - h), h £ z £ l . 11 A radiator with a shifted feed point. The magnetic field on the surface of a real ground Hj = j J (0 ) ¥ 2pr sin k ( L - h ) {exp (- jk ) ( ) } r 2 + L2 - exp - jk r 2 + h 2 ÈÎcos k ( L - h ) - tan kh sin k ( L - h )˘˚ . 5] + 4a a 0 ln(a 12/ 4a a 0 ), F2 = 0. 90) Here, a = kL, a 0 = kh, a 1 = k(L + h). 89) for the short radiator, the reactive component Xg of the loss impedance has an inductive character and is equal in magnitude to the active component Rg.

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