RU1814116C - Dipole aerial - Google Patents

Abstract

Usage: as a weakly directional transceiver antenna of linear polarization. SUMMARY OF THE INVENTION: a vibrating antenna comprises a half-wave dipole mounted parallel to a metal mast and connected through a quarter-wave length of a symmetrical line to the inner ends of two single-wire half-wave lines located collinear one another above the outer surface of the metal mast and connected to it by the outer ends. The midpoints of single-wire half-wave lines with jumpers passing through holes in a metal pipe half a wavelength apart are connected to the central conductor of the coaxial line, the outer conductor of which is formed by the inner surface of the metal pipe. Excitation of the geometrically symmetric structure of series-connected transmission lines with two antiphase voltages, taken from two points of the coaxial line spaced one half from the other by half a wavelength, allows electrical balancing with a transformation ratio of 4: 1, with the directions of the currents in single-wire half-wave lines x relative to the external Observer are the same. The presence of single-wire half-wave lines over the external; The surface of the metal pipe increases its equivalent diameter, thereby increasing the width of the reflector and reducing the back radiation. 1 ill. w Ј

Description

The invention relates to antenna technology and can be used as a weakly directional linear polarization transceiver antenna.

The purpose of the invention is to reduce back radiation.

The drawing shows a vibrator antenna, a section.

The vibrating antenna comprises a half-wave dipole 1. connected to a quarter-wave segment 2 of a symmetrical line, which is connected to two single-wire half-wave lines 3 and 4, collinear one another above the outer metal surface; mast 5, and connected to it by the outer ends of the coaxial line 6, formed by a Central conductor 7 mounted on a metal insulator 8, and the inner surface of the metal

masts 5, and two jumpers 9 and 10, each connected through holes 11 and 12 in a metal pipe 5, spaced apart by a half-wave distance, with one end to the central conductor 7 of the coaxial line, and the other end to the middle of the corresponding single-wire half-wave lines 3, 4,

Vibrator antenna works as follows.

Coaxial line 6 is short-circuited at the ends and loaded on the input conductivities of ds and ds of single-wire lines 3 and 4, respectively equal to each other, at points located at distances of 0.25 A and 0.75 A, where A is the wavelength from the spot short circuit.

At the junction point of jumper 4, the input conductivity will be equal to the sum of the conductivity of the short-circuited quarter-wave line 8 equal to zero. ..-.-. .

The input conductivity dz or d $ of a single-wire line at the junction point of jumper 9 or 10 is equal to the sum of the conductivity of the quarter-wave short-circuited line and the conductivity equal to

UL / 2 W3

)

where L / 2 is the impedance of the symmetrical line 2 and the single-wire line 3 and 4, respectively;

RA- input impedance of a half-wave dipole.

Thus, the input conductivity at the junction point of jumper 10 is equal to

4 (W2 y

(L

RA W3; -,

Consistency with the wave conductivity of coaxial line b is achieved by choosing the ratio of the wave resistances W2 and

W3 ...

When the generator is connected to a matched coaxial line b, a TEM traveling wave propagates in it, the energy of which is divided in half between the jumpers 10 and 9 and propagates further along the single-wire line 4 and 3 also in the form of a TEM wave and along a symmetrical line 2 in the form of a corresponding TEM wave exciting a standing current wave in a half-wave dipole 1. A stoch current wave in a half-wave dipole 1 excites standing waves on the surface of a metal mast 5 and single-wire lines 3 and 4, which act as a reflector with an increased ju with prototype equivalent diameter. Increasing the equivalent diameter of the reflector reduces the antenna backlight.

SUMMARY OF THE INVENTION A vibrator antenna comprising a half-wave dipole connected to a quarter-wave segment of a symmetrical line and mounted parallel to a metal mast, a coaxial line and a balancing element, characterized in that two single-wire half-wave lines are introduced to reduce backward radiation introduced collinearly one another above the outer surface of the metal mast and connected to it by the outer ends and the inner ends with the ends of the conductors of a symmetrical line, introduced a neutral conductor mounted on a metal insulator coaxially with the inner surface of the metal pipe and forming a coaxial line with it, while the balancing element is made in the form of two jumpers connected each through apertures in the metal pipe half a wavelength apart from one another. one end to the central conductor of the coaxial line, and the other end to the middle of the corresponding single-wire half-wave line,