By Boris Levin
The ebook bargains with theoretical and experimental learn of antennas. The presentation relies at the electromagnetic concept. It starts off with the speculation of skinny antennas. skinny antennas characterize one of many major varieties of radiators, hence the speculation of skinny antennas is the foundation of the antennas research.
Special cognizance is paid to the fundamental equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that's such as the equation of Hallen with an exact kernel. including the research of assorted sorts of antennas, the publication offers with the issues of synthesis together with the production a wide-band radiator through picking of the categories and the magnitudes of targeted 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 1/2 the publication, together with the result of program of a reimbursement process for the safety of people opposed to irradiation and structural good points of send antennas.
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Extra resources for Antenna Engineering : Theory and Problems
7 Folded antenna (a), multi-radiator antenna with the complex load (b), and the transmission line equivalent to a multi-radiator antenna (c). These formulas expand essentially the scope of the method of induced emf. Comparison of the results of calculations by these formulas and numerical methods confirms their correctness. Up to now the subject of discussion was application of the induced emf method for calculating the input impedance of an antenna. But this method is applied widely also for solving another problem – estimating the reciprocal influence of radiators by means of calculating their mutual impedances.
E. 64) L ¸Ô 1 ÏÔ ZA = - 2 Ì Ez ( J ) J( z)dz - Z1 J 2 ( z1 )˝ . 6b) L N ¸Ô 1 ÏÔ ZA = - 2 Ì Ez ( J ) J( z)dz Zn J 2 ( zn )˝. 66) are proportional to the square of the current and the magnitude of the concentrated load. It is worth emphasizing that the connection of loads changes the current distribution along the radiator and the field of the current. 5 Antennas with constant (a) and piecewise constant (b) surface impedances. 6 l2 Antennas with one (a) and several (b) concentrated loads. 7a), which is an example of an antenna consisting of several parallel wires, we obtain 1 ZA = - 2 Jg L Ú E ( J )J(z)dz .
The analysis of two-radiator systems is based on the fact that the current of one radiator creates the field, which has the electrical component tangential to the surface of the second radiator. This component induces the field EV (J1)dV on the surface of element dV of the second radiator. In order to execute the boundary condition EV = 0 on this surface, the own field of the second radiator on its surface must be equal to –EV (J1)dV. The generator of the second radiator must increase the power in the element dV by dP = –EV (J1)J2(V)dV and, accordingly, the power in the entire radiator by L2 P=- Ú E ( J )J (V )dV .