SU1688334A1 - Disk-type irradiator with variable field polarization - Google Patents

Abstract

The invention relates to antenna technology and can be used as an irradiator of mirror antennas. The purpose of the invention is to expand the operating range towards high frequencies. A disc feed with variable polarization contains two coaxial discs 1,2. the first pair of pins 3, block 4 phasing, a circular waveguide 5 with a round flange 6 at its open end, a rigid coaxial feeder with a center conductor 7 and an outer conductor 8, a second pair of pins 9. With the introduction of a circular waveguide 5 with a round flange 6 an open resonator is formed between the circular flange 6 and the disk 1, which forms an additional disk emitter with a wavelength of D “. Thus, an extension of the working range towards high frequencies is achieved when the polarization of the radiated field can be changed from a circular different direction of rotation to either of the two linear orthogonal and vice versa. 2 Il.

Description

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The invention relates to antenna technology and can be used as an irradiator of mirror antennas.

The purpose of the invention is to expand the operating range towards high frequencies.

FIG. Figure 1 shows a block diagram of a disk illuminator with a polarization polarized; in fig. 2 - the same, with dielectric filling.

A variable-polarization disk feed contains two coaxial disks 1 and 2, the first pair of pins 3 (one pin is shown), a 4 phase unit, a circular waveguide 5 with a round flicker 6 at its open end, a rigid coaxial feeder with a center conductor 7 and outer conductor 8, the second pair of pins 9.

In order to reduce the influence of the external diameter of the circular waveguide 5 on the radiation characteristics and increase the excitation efficiency of the resonator formed by the circular flange 6 and the disk 1, a dielectric insert can be inserted into the coaxial waveguide formed by the outer conductor 8 of the rigid coaxial feeder with the circular waveguide 5 10 (2-3) Av, and the transition from the section of the circular waveguide 5 without dielectric filling to the section with the dielectric insert 10 is made in the form of a conical transition 11 (Fig. 2).

The phasing unit 4, which provides the excitation of pins 3 and 9 with different phase shifts, can be implemented, as in the prototype, as a switch on pln diodes using sum-phase-phase bridges, 3 dB-directed adders, and line segments transfer.

The disk feed with variable polarization operates as follows.

The power to the disk feed formed by disks 1 and 2. is fed through a rigid coaxial feeder, the center conductor 7 of which is connected to the input of the phasing unit 4, the outputs of which are connected to the pins 3 and 9. The external conductor 8 of the hard coaxial feeder is connected to the disks 1 and. (i.e. performs the functions of a shorting switch) and can be used to mount the disks 1 and 2 and fix the disk illuminator at the focus of the mirror antenna.

By changing the excitation modes of the pins 1 and 2 using the phasing unit 4, one can excite a disk feed with the possibility of changing the polarization of the field from a circular one with an arbitrary direction of rotation to either of the two linear orthogonal polarizations and back.

When conducting power to the pin m 9

Through a coaxial waveguide formed by a circular waveguide 5 and the outer conductor 8 of a rigid coaxial feeder, a resonator formed by a round flange b and a disk 1 is excited. The dimensions of the coaxial waveguide are selected according to the condition of the N c wave propagating in it. The dimensions of the circular flange 6 and the distance between the circular flange 6 and

the disk 1 is chosen so as to ensure its effective excitation and emission of this additional radiator at the required frequency Av.

Thus, a wider working range is achieved towards high frequencies.

Claims (1)

The invention of the disc feed with variable polarization of the field containing two coaxial a disk, between which perpendicular to the disks, a first pair of pins is placed, placed at equal distances from the center of the cells at mutually perpendicular radii and connected to the corresponding outputs of the phasing unit, whose input is connected to the central conductor of the rigid coaxial feeder, are located along A common axis of the disks, which are fixed on its outer conductor, characterized in that, in order to extend the working range towards high frequencies, a circular waveguide is introduced, which is located concentrically with rigid coaxial feeder, and a second pair of pins installed at diametrically opposite points on its inner wall, perpendicular to the common axis, and connected to the corresponding outputs of the phasing unit, while at the open the end of a circular waveguide facing the discs has a circular flange with a diameter of 0.5 ÅV, where Ae is the wavelength corresponding to the upper frequency of the operating range, with the inner radius of the circular waveguide selected from the ratio where RI is the radius of the outer conductor of the coaxial feeder, and the distance between the circular flange and the disk is 0.1 A “. I /