SU1589341A1 - Radiation source with rotatory polarization of radiation - Google Patents

Abstract

The invention relates to antenna technology and can be used as an irradiator of mirror antennas in radio engineering complexes for various purposes. The purpose of the invention is to reduce the diffraction lobes of the radiation pattern, as well as to expand the working frequency band. The circular polarized radiation irradiator contains a supply feeder in the form of a coaxial cable segment in which a polarizer is placed, and a cavity resonator, in the end of which there are half-wave slots spaced at equal angular intervals at a distance of λ 0/4 from the axis of the cavity resonator, which combined with the longitudinal axis of the feed feeder. The cavity resonator can be made in the form of a cylindrical resonator with the H 110 wave or a crosswise connection of mutually orthogonal rectangular waveguides with short-circuited ends. Moving pistons can be used as shorting clamps. By moving them, the cavity resonator can be adjusted. expansion of the working frequency band of the irradiator. When choosing the size of a coaxial waveguide from the ratio λ / ϕ√ 1 + R 2 * 982 λ / ϕ, where λ is the wavelength in the waveguide

λ 0 is the wavelength in free space

R 1, R 2 are the radii of the inner and outer conductors, respectively, and placing the half-wave slots at a distance of λ 0/4 from the axis, the distance between them is smaller than λ 0/2, which ensures a reduction in the diffraction lobes of the irradiator pattern. 3 hp ff, 2 ill.

Description

The invention relates to antenna technology and can be used as an irradiator of mirror antennas in radio engineering complexes for various purposes.

The purpose of the invention is to reduce the diffraction of 1x lobes of the radiation pattern (DN), as well as to expand the working frequency band.

FIG. Figure 1 shows an irradiator with circular polarization of radiation.

general view, in FIG. 2 is the same as the execution example.

The circular polarized radiation irradiator contains a feed feeder, made in the form of a segment 1 of a coaxial waveguide with a polarizer 2 placed in it, which can be made in the form of two dielectric plates with bevels or four pins, excited with a progressive phase shift 90, cavity resonator 3 , in the end of which half-wave slots 4 are made, located with equal angular intervals at a distance from the axis of symmetry of the cavity resonator 3. The cavity resonator 3-can be made in the form of a cylindrical reson torus (Fig. 1) operating at wave H, (its diameter is in this case chosen from the ratio 0.58 L D 0.766 I, and the height can be selected by setting the rear end surface with the possibility of movement) or (Fig. 2) in the form of a cross the structures formed by rectangular waveguides are short-circuited at both ends (for example, by means of short-pistons 5 installed with the possibility of longitudinal movement). To ensure the propagation of the type H wave, in section 1 of the coaxial waveguide its inner R and outer R. The radii should be chosen from the corresponding. Shift pistons 5 in the cavity resonator of FIG. 2 allows its frequency to be adjusted, i.e. ensure that the specified effect is achieved in the extended frequency band.

Form

ten

la invented

wear, R 2 L / if (at that 1.5-2 depending on the requirements for the excitation efficiency of the cavity resonator 3 and its dimensions).

Circular Polarized Illuminator

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Claims (4)

1. An irradiator with a circular field of radiation containing a feed feeder placed inside it along. A resonator, a cavity resonator, in one, 5 of the ends of which are made of four half-wave slits, located in equal angular intervals symmetrically with respect to the axis of symmetry of the cavity resonator, combined with the 2Q longitudinal axis of the feed feeder, which is designed to reduce diffraction patterns. Forward radiation pattern, pita 25 feeder feeder is designed as a segment of a coaxial waveguide with dimensions / 1 R, + R, 2; | / T, where R ,, R is the radii of its internal and external conductors, respectively, I-dl on the waves in the waveguide and half-wave PGR P1L g L, f,,. . -j -idicjii, with circular polarization radiation works as follows. 30 slits are placed on where lo is the wavelength in the free In section 1 of the coaxial waveguide, an H wave is excited, which with the help of polarizer 2 is converted into an electromagnetic wave with circular polarization and excites volume resonator 3 on the main type of wave (for its adjustment, it is possible to move the rear end wall and set About ka matching element in its center) and the radiation of half-wave slits 4. With the proposed size ratios, one can always choose segment 1 of a coaxial waveguide with R / 1 „/ 4. 45 It is possible to place half-wave slits 4 on a circle with a radius of /, / 4, when the distance between them is less than / 2, which corresponds to the elimination of 50 diffraction maxima in the array of emitters and leads to a decrease in diffraction lobes in the bottom of the irradiator. - - - - - 1 CL WJVJ P space, from the axis of symmetry of the cavity resonator. 2. The irradiator according to claim 1, about t l and - due to the fact that the cavity resonator is made in the form of a cylindrical resonator with a wave H 3. The irradiator according to claim 1, originating from the fact that the cavity resonator is made in the form of two mutually orthogonal intersecting rectangular waveguides, which are short-circuited at both ends, whose wide walls are located in the same plane. 4. The irradiator on the PP. 1 and 3, characterized in that, in order to expand the working frequency band, the short-circuited ends of the rectangular waveguides are made in the form of short-closing pistons installed with the possibility of longitudinal movement. The movement of the shorting pistons 5 in the cavity resonator 3 of FIG. 2 allows its frequency to be adjusted, i.e. to ensure the achievement of the specified effect in the extended frequency band. Form ten la invention 1. An irradiator with circular polarization of radiation, containing a feeding feeder, a polarizer placed inside it, a cavity resonator, in one, 5 of the ends of which four half-wave slits are made, located with equal angular intervals symmetrically relative to the axis of symmetry of the cavity resonator, aligned with Q a longitudinal axis of the feed feeder which is attached to this end, characterized in that in order to reduce the diffraction lobes. The radiation pattern, powering the feeder is designed as a segment of a coaxial waveguide with dimensions / 1 R, + R, 2; | / T, where R ,, R -. the radii of its inner and outer conductors, respectively, are the wavelength in the waveguide and the half-wave PGR P1L g L, f,,. . 0 slits are placed on where lo is the wavelength in the free - - - - - 1 CL WJVJ Pr space, from the axis of symmetry of the cavity resonator. 2. The irradiator according to claim 1, about tl and is due to the fact that the cavity resonator is made in the form of a cylindrical. wave resonator 3. The irradiator according to claim 1, originating from the fact that the cavity resonator is made in the form of two mutually orthogonal intersecting rectangular rectangular waveguides whose wide walls are located in the same plane. 4. The irradiator on the PP. 1 and 3, characterized in that, in order to expand the working frequency band, the short-circuited ends of the rectangular waveguides are made in the form of short-closing pistons installed with the possibility of longitudinal movement. 1 FIG. 2