By Boris Levin
The booklet 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 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's similar to the equation of Hallen with an actual kernel. including the research of varied kinds of antennas, the e-book offers with the issues of synthesis together with the construction a wide-band radiator by way of picking of the kinds and the magnitudes of centred 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 half the booklet, together with the result of program of a reimbursement technique for the security of people opposed to irradiation and structural positive aspects of send antennas.
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Extra resources for Antenna Engineering : Theory and Problems
E. N È ˘ d 2 J ( z) 2 + ( ) = 4 pwec ( ) + ( , ) k J z K z W J z J( zn )Zn d( z - zn )˙ . 61) that N/2 Ez ( a, z) - L £ Z £ L + K ( z) - Â J(z )Z [d(z - z ) + d(z + z )] = 0 .
1 with the results presented in . Input impedance is given for four variants of the arm length. e. it varies with the frequency. Such parameters adopted for ease of comparison of the input impedance with results of other authors collected in . 1 as the results of solving equation of Leontovich-Levin. The methods used by different authors at different times have been seriously substantiated. The equation of Leontovich-Levin is the most rigorous variant among 36 Antenna Engineering: Theory and Problems integral equations of the theory of thin antennas.
49). But for that, the equality J1(1) (s) = - J1(1)* (s) must be accomplished. e. there should be no losses in the radiator and in the environment. From the foregoing it follows that in the analysis of the methods of calculating characteristics of the antenna it is necessary to take into account that in the second and subsequent approximation the current along the antenna wire contains not only reactive but also active component. The method of induced emf is equivalent to the analysis of the antenna in the second approximation.