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Antenna Engineering : Theory and Problems by Boris Levin

By Boris Levin

The publication bargains with theoretical and experimental learn of antennas. The presentation is predicated at the electromagnetic thought. It starts off with the idea of skinny antennas. skinny antennas signify one of many major varieties of radiators, therefore the idea 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 immediately thin-walled steel cylinder, that's such as the equation of Hallen with an actual kernel. including the research of varied different types of antennas, the booklet bargains with the issues of synthesis together with the construction a wide-band radiator via deciding upon of the kinds and the magnitudes of targeted 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 half the publication, together with the result of program of a reimbursement procedure for the security of people opposed to irradiation and structural positive factors of send antennas.

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Extra info for Antenna Engineering : Theory and Problems

Example text

5) where G3 = exp(– jkR3)/(4pR3), R3 = ( z - V)2 + a 2 . 2). 6) which also is the integral equation for the current along a filament of a finite radius. The first solution of Hallen’s equation with an approximate kernel was found by Hallen himself and is described in detail in [10]. The solution uses magnitude W = 2 ln(2L/a) = 1/c as the parameter, in inverse powers of which function J(z) is expanded into a series. 7) ◊ 60W cos kL + B1 (L)/ W + B2 (L)/ W 2 + … B1 (L) ˘ e e È N ( z) sin k(L - z ), J1H ( z) = j Í 1 ˙ .

55) Ratio k1/k is usually referred the slowing. 54) allows to find the current in the second approximation, to determine the active component of input impedance and to Integral Equation Method 43 define more precisely the magnitude of reactive component. 43). 49), we find for the single radiator (n) ZA ª- L1 1 È J (n -1) (0)˘ Î ˚ 2 Ú ÍÎE ( J È z ( n -1) - L1 ) - 2Zpa J ( n -1) ˘ ( n -1) ( z)dz . 50) written in accordance with the induced emf method. A radiator with constant surface impedance is a particular case of a radiator with impedance, changing along the antenna.

5) where G3 = exp(– jkR3)/(4pR3), R3 = ( z - V)2 + a 2 . 2). 6) which also is the integral equation for the current along a filament of a finite radius. The first solution of Hallen’s equation with an approximate kernel was found by Hallen himself and is described in detail in [10]. The solution uses magnitude W = 2 ln(2L/a) = 1/c as the parameter, in inverse powers of which function J(z) is expanded into a series. 7) ◊ 60W cos kL + B1 (L)/ W + B2 (L)/ W 2 + … B1 (L) ˘ e e È N ( z) sin k(L - z ), J1H ( z) = j Í 1 ˙ .

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