JPS5951761B2 - Linear polarization circular polarization switcher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave circuit that electrically switches between linearly polarized waves and circularly polarized waves.

First, a conventionally known irreversible circularly polarized wave generator using a ferrimagnetic material will be explained, and then the present invention will be explained.

FIGS. 1a and 1b are diagrams showing the structure of an irreversible circularly polarized wave generator, with FIG. 1a being a perspective view and FIG. 1 being a sectional view taken along line A-A'.

A plated waveguide 2 is formed by metallizing the entire surface of a square or round ferrimagnetic material 1 of a predetermined size except for both end surfaces.

Thereafter, permanent magnets 3 of predetermined dimensions are arranged symmetrically on all four sides of the plated waveguide 2 so that the polarities of adjacent magnetic poles are opposite to each other.

Next, the operating principle of the irreversible circularly polarized wave generator will be explained as follows.

FIG. 2 is a diagram for explaining the operation, and x −x
Considering the case where a pseudo TE01 wave with an electric field component parallel to the line propagates in the direction shown, the ferrimagnetic material 1
shows a positive magnetic permeability μya for microwaves, and Y−Y′
Radio waves with electric field components parallel to the line exhibit negative magnetic permeability μ-.

Since the incident linearly polarized wave is a pseudo TE01 wave with an electric field component in the z-z' line direction, the electric field can be divided into the xx' line and the Y-Y line.
'When considered separately into linear components, as mentioned above, the magnetic permeability shown for each ferrimagnetic material is different, and the propagation constant is different.

Therefore, by appropriately selecting the strength and length of the magnetic field of the permanent magnet 3, a circular fatigue generator can be obtained.

However, unlike the normal screw type and dielectric type, the operation is irreversible.

The above is the operating principle of an irreversible circularly polarized wave generator using a ferrimagnetic material, and it is intended to use this to create a circularly polarized wave/linear polarized wave switcher.

This invention performs circular polarization switching electrically, and will be described in detail below.

FIG. 3 shows the structure of an embodiment of a linearly polarized/circularly polarized wave switching device based on this sprouting, in which a ferrimagnetic yoke 5 as shown is attached to the outside of the plated waveguide 2. , it has a structure in which Koinoshi 6 is wound.

FIG. 4 is a diagram for explaining the operation, and when the direction of the pulse current flowing through the coil is changed, the state shown in FIG. 4a or FIG. 4S is obtained.

Now, when a linearly polarized wave is incident in the radio wave propagation direction as shown in the figure, if the length of the ferrimagnetic yoke 5 is appropriately selected, it will rotate clockwise in the case of Figure 4 a, and counterclockwise in the case of Figure 4 S. circularly polarized waves are generated.

Furthermore, when a pulse current that erases the magnetization 4 in the ferrimagnetic material 1 is applied, the ferrimagnetic material is demagnetized and behaves like a dielectric material, and the plane of polarization of the incident linearly polarized wave does not rotate. , the output is straight and linearly polarized.

As described above, it is possible to switch between right-handed circularly polarized waves, left-handed circularly polarized waves, and linearly polarized waves depending on the pulsed current flowing through the coil.

FIG. 5 shows the structure of another embodiment of the linear polarization/circular polarization switching device according to the present invention, in which the ferrimagnetic yoke 5 is arranged more symmetrically.

As described above, in the linear polarization/circular polarization switching device according to the present invention, circular polarization (right-handed rotation, left-handed rotation) is generated by pulsed current flowing through the coil.
This has the effect of being able to switch linearly polarized waves.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the structure of a conventional irreversible circularly polarized wave generator using a ferrimagnetic material, Fig. 2 is a diagram for explaining the operation of the irreversible circularly polarized wave generator, and Fig. 3 is a diagram of the present invention. Fig. 4 is a diagram for explaining the operation of the linear polarization circular polarization switch according to the present invention, and Fig. 5 is a diagram showing the structure of an embodiment of the linear polarization circular polarization switch according to the present invention. It is a figure which shows the structure of another Example of a polarization switcher. In the figure, 1 is a ferrimagnetic material, 2 is a plated waveguide, 3 is a permanent magnet, 4 is magnetization, 5 is a ferrimagnetic yoke, and 6 is a coil. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] 1. A plated waveguide is formed by metallizing the entire surface of a square or round ferrimagnetic rod except for both end surfaces, and a ferrimagnetic yoke of an appropriate size around which a coil is wound is attached to the plated waveguide. 1. A linearly polarized/circularly polarized wave switching device, characterized in that it is arranged outside of the ferrimagnetic body and configured so that the magnetization distribution of the quadrupole magnet remains in the plane in the direction perpendicular to the propagation of radio waves in the ferrimagnetic body. □ □