RU2440646C2 - Polarisation selector - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: polarisation selector has a square waveguide, whose lateral sides fit with two rectangular gradually tapering waveguides, at the inputs of which there are vertical rods, and behind them in the square waveguide, there is a horizontal metal plate and a transforming step adapter to the rectangular cross section, and the symmetrically arranged square waveguides end with inner waveguide-to-coaxial adapters which enter two narrower symmetrically arranged square waveguides, turned 90° relative the input waveguide and reduced into one square waveguide.

EFFECT: smaller size.

6 dwg

Description

The polarization selector belongs to the field of antenna technology and can be used in radio systems of various purposes as a basic element of the irradiator of mirror antennas to ensure dual frequency use due to polarization isolation.

Known polarizing selector (Symmetric Reverse-Coupling Waveguide Orthomode Transducer for the 3 - mm Band / Alessandro Navarrini and Renzo Nesti - IEEE Transactions on microwave theory techniques, vol. 57, No.1, January 2009.), made in the form of a cover in which waveguide channels are cut in the form of a structure with symmetric reverse connections (Symmetric Reverse-Coupling Structure).

The disadvantage of such a polarization selector is its large dimensions.

The closest in technical essence to the claimed invention is a polarizing selector selected as a prototype. (A Full Waveguide Band Orthomode Junction / E.Wollack - NRAO, Charlottesville, VA, may 16, 1996.), also made in the form of a housing-cover construction, in which waveguide channels with double symmetric connection are cut (B0ifot, AM, Lier, E., Schaug-Pettersen, T., \ Simple and Broadband Orthomode Transducer, "1990, Proc. IEE, vol. 137, no.6, pp.396-400).

A disadvantage of the known device is also the large size.

The main task solved by the claimed invention is to create a polarizing selector with smaller dimensions.

The main technical problem is solved in that in a polarizing selector including a square waveguide, two rectangular smoothly tapering waveguides symmetrically fit to the side walls of which the rods are vertically mounted at the inputs, and behind them, in a square waveguide, a plate and a transforming step transition to rectangular cross section, according to the proposed solution, symmetrically located rectangular waveguides end with an internal coaxial waveguide transformer transitions included in two narrower symmetrically located rectangular waveguides, rotated through an angle of 90 ° relative to the input waveguide and combined into one rectangular waveguide.

The inventive device has a difference from close analogues, therefore, the solution satisfies the condition of patentability of the invention of "novelty."

An analysis of the prior art on the conformity of the proposed solution to the patentability condition of the invention “inventive step” showed the following: internal coaxial waveguide transitions allow you to rotate the waveguide channel 90 ° along a wide wall without the use of bulky waveguide bends and reduce the length of the smooth transition in the side shoulders, as it happens transition to the waveguide of the desired cross section before summing the power.

The invention is illustrated by drawings, where Fig. 1 shows a sectional view of a device, Fig. 2 is a cross section of a device, Fig. 3 is a general view of a device, Fig. 4 is a longitudinal section of a device, and Fig. 5 is a graph of a reflection coefficient in the operating frequency band for the third arm, FIG. 6 is a graph of the reflection coefficient in the operating frequency band for the straight arm (E ₁ ) and a graph of the polarization isolation between the arms of the polarization selector.

The polarization selector consists of a housing 1, a cover 2 and flanges 3, which when connected to each other form a waveguide channel of complex geometry. In the waveguide channel, which is formed by the connection of the housing 1 and the cover 2, rods 4, a metal plate 5, a connector for the coaxial waveguide transition (CWP) of the straight arm 6, tuned screws 7 for the CWP of the straight arm 6, internal KVP 8, which are a waveguide -coaxial transition, a section of the coaxial path and a coaxial-waveguide transition, trimming screws 9 for internal LPC 8. In the waveguide channel, which is formed by connecting two flanges 3, a connector for LPC of the third arm 10 and trimming screws 11 are installed for KVP of the third shoulder 10 (see figure 3). To attach the polarization selector to the antenna feed at the input of the waveguide channel formed by the housing and the cover, a nut 12 is installed.

The polarization selector operates as follows.

When applying high-frequency energy to the polarization selector from a common input (Fig. 4), consisting of a small section of a circular waveguide (I), which is then replaced by a square waveguide with rounded corners (II), two waves with mutually perpendicular polarization are excited in these waveguides - vertical (E1) and horizontal (E2), which are sent to the straight shoulder, which ends with connector 6 and to the side of the shoulder, which ends with connector 10, respectively. Waves, in which the vector E1 is perpendicular to the plane of the metal plate 5, pass a straight shoulder without reflection from the discontinuities of the walls in section III, which serve as channels for another polarization, since rods 4 are installed in these discontinuities. In turn, waves E2, for which the metal the plate 5 is the back wall of the T-shaped connection of the waveguides V and II, separated into two symmetric channels using this connection and fed to the internal HIC 8. Next, using the internal HEC 8, the waves E2 enter the waveguide channel, connected by the connection of the flanges 3, where they are summed in a waveguide of rectangular cross section and enter the connector for KVP 10.

The proposed solution allows to reduce the length of the device by 35-40%.

Claims (1)

A polarization selector including a square waveguide, two rectangular smoothly tapering waveguides symmetrically fit to the side walls, the rods are vertically mounted at the inputs, and behind them, in a square waveguide, there is a metal plate and a transforming step transition to a rectangular section, characterized in that symmetrically located rectangular waveguides end with internal coaxial-waveguide transforming transitions, which are two more narrow symmetrically arranged rectangular waveguide, rotated through 90 ° relative to the input waveguide and summarized in a rectangular waveguide.

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