By Boris Levin
The ebook offers with theoretical and experimental study of antennas. The presentation is predicated at the electromagnetic conception. It starts off with the speculation of skinny antennas. skinny antennas signify one of many major sorts of radiators, hence the speculation of skinny antennas is the root of the antennas research.
Special cognizance is paid to the indispensable equation of Leontovich-Levin for a present alongside a directly thin-walled steel cylinder, that's resembling the equation of Hallen with an exact kernel. including the research of assorted varieties of antennas, the ebook offers with the issues of synthesis together with the construction a wide-band radiator via selecting of the categories 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 software of a reimbursement process for the security of people opposed to irradiation and structural positive aspects of send antennas.
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Additional resources for Antenna Engineering : Theory and Problems
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 ) ˘ . 22), c 2J2(0) = cJ1(0) + c2J22(0). 23), c c J22 (0) = j 60 cos a 2 L Ú E ( cJ )sin k (L - V ) dV .
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 . V 1 2 -L2 Power P is equal to the power induced by the first radiator in the second radiator, and the ratio of power P to the square of the current of the second generator determines the magnitude of additional impedance, which the first radiator induced in the second radiator: Z21ind 1 =- 2 J 2 (0 ) L2 Ú E ( J )J (V)dV .
6a. The integral equation for the current in such antenna is easily derived from the equation for the current in a metal dipole. The connection of concentrated complex impedance Zn in a wire (at point z = zn) is equivalent to connection of additional concentrated emf en = –J(zn)Zn, which produces the extraneous field En = - J( zn )Zn d( z - zn ). 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 .
Antenna Engineering : Theory and Problems by Boris Levin