SU398173A1 - Beam divider - Google Patents

Description

one

This invention relates to microwave technology. The device is intended for use in the quasi-optical transmission lines of the millimeter and submillimeter ranges for undistorted beam division of arbitrary polarization.

There are known beam splitters for a quasi-optical transmission line containing one-dimensional wire grids: grids or wire grids (two-dimensional grids) in the diagonal branching plane of the light guides, a state of two groups of equidistant parallel wires that form a right angle between them.

Wire grid dividers almost completely polarize the signal transmitted and reflected from them. The polarization properties of dividers with a grid are less pronounced, however, they also distort the signal polarization if the latter contains components polarized in an azimuthal plane not parallel to the wires.

The circuit of the invention is undistorted division of the beam with arbitrary polarization in any form of oscillations.

The proposed divider is distinguished by the fact that in the diagonal plane of the symmetric four-arm branching of the beam transmitters a wire mesh is placed, the cells of which are made so that their projections on the planes, which are perpendicular to the beam heads, are squares.

FIG. 1 shows the proposed device.

A symmetric branching consisting of shoulders 1-4 is formed by two beam guides intersecting at a right angle. In the diagonal plane of the branching, a wire mesh 5 is installed,

The exciting wave of arbitrary polarization comes from the side of one of the arms of the branching of the beam drivers, for example, from the side of shoulder 1. This wave can be decomposed into two components; one with an electric vector lying in the plane of incidence, and the other polarized in a plane perpendicular to the plane of incidence. At a certain angle between the wires of the grid and the symmetric arrangement of the grid relative to the plane of incidence, the same reflection coefficients (and transmission) are provided for both basis polarizations, and thus undistorted division of the beam between the shoulders (2 and 3) of the divider is realized for any type of oscillation.

FIG. Figure 2 shows the character of the dependence of the transmission coefficient (for example, from arm 1 to arm h) of a signal through the grid as a function of the angle between the wires for two polarizations. At the intersection point of these curves, at an angle between the wires 7O, the transmission coefficient and the reflection coefficient are almost independent of polarization.

At the same time, it can be noted that, at an angle between the wires of the 7 O, the grid lying in the diagonal plane of the branching is projected on the plane perpendicular to the direction of wave propagation

(perpendicular to the beam axis, in the form of a grid with square cells.

The proposed divider does not allow to smoothly adjust the division ratio: in order to move from one division ratio to another, the cassettes are changed that contain grids with one or another step.

Claims (1)

Invention Formula A beam divider for a quasi-optical transmission line containing a wire mesh in the diagonal plane of the four-arm branching of the beam paths, characterized in that, in order to undisturbedly dividing the wave of arbitrary polarization in any kind of oscillations, the grid cells are diamond-shaped with one of the corners at apex 70, and the grid is located so that the projections of the cells on the planes, perpendicular to the axes forming the branching of the light guides, are squares. f / g / {5 ° The angle between the prokolokomi (° J - 90