By Boris Levin
The booklet bargains with theoretical and experimental examine of antennas. The presentation is predicated at the electromagnetic concept. It starts off with the speculation of skinny antennas. skinny antennas signify one of many major varieties of radiators, therefore the speculation of skinny antennas is the foundation of the antennas research.
Special awareness is paid to the vital equation of Leontovich-Levin for a present alongside a immediately thin-walled steel cylinder, that is comparable to the equation of Hallen with an actual kernel. including the research of varied forms of antennas, the ebook offers with the issues of synthesis together with the construction a wide-band radiator through deciding on of the categories and the magnitudes of targeted rather a lot, 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 booklet, together with the result of program of a repayment strategy 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
E. to connecting the generator at point z = h. 1) contains as in embryo all the integral equations of the theory of the thin antennas. The external appearance of the equations depends mostly on the selection of function Ez( J). 27), we obtain the integral equation of Hallen for the current along a filament. 3) 28 Antenna Engineering: Theory and Problems where G1 = exp(– jkR1)/(4pR1), R1 = |z – V|. 28), we obtain Hallen’s integral . equation for the current along a straight thin-wall metal cylinder (the equation with exact kernel) 1 2p 2p L j Ê e ˆ ÁË C cos kz + sin k z ˜¯ .
But at first it is necessary to show the consequences, which are follow from this result. 26) This means that the input impedance of the antenna in this approximation is equal to ZA2 = e : ÈÎ2 c J1 (0 ) - 30 c 2 F (a ) J12 (0 ) sin 2 a ˘˚ = 30 . 25). 15) the input current of no resonant radiator in the second approximation is equal to J(0) = +cJ1(0) + c 2J2(0), and c 2J2(0) << cJ1(0), if J1 Ŭ 6CMKPI VJKU KPGSWCNKV[ KPVQ CEEQWPV QPG ECP YTKVG KP a first approximation: ZA2 = È c2 J 2 ( 0 ) ˘ 1 È c2 J 2 ( 0 ) ˘ .
7b, is an example of a radiator consisting of wires with different lengths. 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.