Antenna Engineering : Theory and Problems by Boris Levin

By Boris Levin

The booklet bargains with theoretical and experimental study of antennas. The presentation is predicated at the electromagnetic conception. It starts with the speculation of skinny antennas. skinny antennas characterize one of many major varieties of radiators, therefore the idea of skinny antennas is the foundation of the antennas research.

Special recognition is paid to the crucial equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that is akin to the equation of Hallen with an exact kernel. including the research of assorted sorts of antennas, the booklet bargains with the issues of synthesis together with the production a wide-band radiator by way of picking of the kinds and the magnitudes of centred quite a bit, that are hooked up 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 ebook, together with the result of software of a reimbursement procedure for the safety of people opposed to irradiation and structural good points of send antennas.

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The error of the published proof consisted in that the author proceeded from purely reactive magnitude of the current. 5 INTEGRAL EQUATIONS FOR COMPLICATED ANTENNAS The previous sections were devoted to integral equations for the currents along straight metal radiators. Antennas with distributed and concentrated loads are more complicated variants of radiators. 5a) is an example of a radiator with distributed load. 51) where Ez(a, z) and Hj(a, z) are the tangential component of the electric field and the 42 Antenna Engineering: Theory and Problems azimuthal component of the magnetic field, respectively, and Z(z) is a surface impedance, which is in the general case dependent on coordinate z.

The antenna contains the central radiator with complex load Z1 and side radiators situated around it and connected with it at the base. 65). The current distribution along the antenna wires is found by means of the theory of electrically coupled lines. 7c) consists of three wires. The first wire is equivalent to the central radiator, the second wire is equivalent to the system of identical side radiators, and the third wire is the ground. Since the wires of the equivalent line have different lengths and the complex load is connected in the central radiator, the line should be divided into three segments.

If M1 + jM2 is a b2 Ú value of an order exp(–jkr) and b2 grows, an integral D 1 r d r unlimitedly increases, and b2 integral Ú D rdr 2 b1 tends to be zero in proportion to 1/b1. e. cannot contain summands of order exp(–jkr)/r incoming in the expression for Hj 0. The authors of [22] attempted to calculate a change of radiated power, caused by the finite conductivity of the ground. 75). This attempt is incorrect, since within the limits of accuracy of the proposed method the radiated power does not depend on the conductivity of the ground, and the power of losses in the ground and the additional power of the generator are identical.

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