JPS6236324Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a Faraday rotary wave element type reversible phase shifter having excellent reversible phase characteristics.

For convenience of explanation, a Faraday rotary waveform reversible phase shifter using a prismatic ferrimagnetic material with a square bottom will be described here.

FIG. 1 is a perspective view showing the structure of a conventional Faraday rotary wave element type reversible phase shifter, and FIG.
It is an AA sectional view of the figure. The structure of a conventional Faraday rotary wave element type reversible phase shifter is such that an N pole and an S pole are arranged in predetermined directions around a columnar ferrimagnetic body 1 whose side surfaces are coated with metal. a 180 degree plate 3 made up of four permanent magnet plates 2 arranged so as to face each other; and a first and second permanent magnet plate 3 made of permanent magnet plates 2 having the same configuration as the 180 degree plate 3 and having a predetermined magnetic field strength. 2, circularly polarized wave generators 4 and 5, and a columnar ferrimagnetic material 1 having the same bottom surface as the ferrimagnetic material 1 and coated with metal on the side surface.A magnetizing conductive wire 6 is wound on the side surface of the ferrimagnetic material 1, so that magnetization remains. first and second Faraday rotation wave elements 8 and 9 each having a yoke 7 disposed as shown in FIG.
First and second linear polarizers 12 and 13 each having a radio wave absorber plate 11 arranged parallel to the H-plane of the
and the first linear polarizer 12, the first circularly polarized wave generator 4, the first Faraday rotator 8, the 180 degree plate 3, the second Faraday rotator 9, and the second Faraday rotator 9 along the radio wave propagation direction. 2 circularly polarized wave generator 5, second
The linear polarizer 13 is arranged in this order.

Next, the operation will be explained. When a linearly polarized wave enters from the left side of FIG. 2, it passes through the first linear polarizer 12 and enters the first circularly polarized wave generator 4.
It becomes a circularly polarized wave and passes through the first Faraday rotator 8. At this time, when a pulsed current is passed through the magnetizing conducting wire 6, magnetization _M1 remains in the direction shown in FIG. Since the magnetic permeability of the ferrimagnetic body ₁ is determined according to the direction and strength of the magnetization M1, the wavelength of the circularly polarized wave can be controlled by changing the magnetization _M1 . The circularly polarized wave that has undergone the phase change φ passes through the 180-degree plate 3, is converted into a circularly polarized wave that rotates in the opposite direction to the rotation direction of the circularly polarized wave, and passes through the second Faraday rotation wave element 9. do. At this time, a pulsed current is passed through the magnetization conducting wire 6 so that magnetization M ₂ having the opposite direction and the same strength as the magnetization M ₁ in the first Faraday rotation wave element 8 remains. As a result, the relative relationship between the rotation direction and the magnetization direction of the circularly polarized wave is the same in the first Faraday rotary wave element 8 and in the second Faraday rotary wave element 9, so that the circularly polarized wave is It will undergo a phase change φ equal to that when it passes through the Faraday rotation wave element 8. Therefore, the circularly polarized wave that has undergone a phase change of 2φ by the first and second Faraday rotary wave elements 8 and 9 is converted into a linearly polarized wave after passing through the second circularly polarized wave generator 5. It passes through the linear polarizer 13 of No. 2 and propagates to the right side of the figure.

By the way, when manufacturing a Faraday gyroscope type reversible phase shifter, the ferrimagnetic material 1 and the permanent magnet plate 2 are
Due to the non-uniformity of the material, an elliptical polarization may be generated at the 180-degree plate 3. In this case, an elliptical polarization is generated even after passing through the second circular polarizer 5, and the cross-polarized component contained in this elliptical polarization is absorbed by the second linear polarizer 13.

Therefore, the insertion loss of the Faraday rotary waveform reversible phase shifter increases depending on the amount of power absorbed by the crossed polarization components.

In order to solve the above problem in the conventional Faraday rotary wave element type reversible phase shifter, it is necessary to remove the permanent magnet 2 used in the 180 degree plate 3 and adjust the magnetic field strength of each permanent magnet plate 2. It was hot.
Therefore, this adjustment work had the disadvantage of requiring a lot of time and effort.

This idea is to eliminate this drawback by using 180 degree plate 3.
The device is equipped with an adjustment mechanism, and will be described in detail with reference to the drawings below.

FIG. 3 is a diagram showing an embodiment of this invention,
FIG. 2 is a perspective view showing only the 180-degree plate 3 of the Faraday rotary waveform reversible phase shifter. Further, FIG. 4 is a cross-sectional view along AA of FIG. 3.

The 180 degree plate 3 of the Faraday rotating waveform reversible phase shifter according to this invention has the outer periphery of the 180 degree plate 3 of the conventional structure,
Surrounded by an annular magnetic material 14 and a magnetic screw 1
5 are arranged on the magnetic body 14 so as to face the permanent magnet plates 2 of the plate 3 at 180 degrees.

With this structure, the permanent magnet plate 2, the ferrimagnetic body 1, the annular magnetic body 14, the magnetic screw 15, and the gap 16 constitute a magnetic circuit, and the magnetic flux B in the magnetic circuit is as shown in FIG. distributed in Therefore, the length of the gap 16 is changed by the magnetic screw 15, and the magnetic flux B is changed.

As the magnetic flux B changes, the magnetization within the ferrimagnetic body 1 also changes, making it possible to adjust the elliptical polarization factor of the 180-degree plate 3.

That is, the elliptical polarization factor of the 180-degree plate 3 can be easily adjusted using the magnetic screw 15, which is effective in manufacturing a low-loss Faraday rotary waveform reversible phase shifter.

Although the description has been made regarding the prismatic ferrimagnetic body 1 with a square bottom surface, the same can be said of a phase shifter using a cylindrical ferrimagnetic body.

As described above, in the Faraday rotary wave element type reversible phase shifter according to this invention, the elliptical polarization factor of the 180 degree plate 3 can be easily adjusted by providing the adjustment mechanism in the 180 degree plate 3. This has the effect of simplifying the adjustment work necessary to obtain low loss characteristics.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional Faraday rotary wave element type reversible phase shifter, Figure 2 is a sectional view taken along AA of Figure 1, and Figure 3 is a 180 degree plate of the Faraday spiral wave element type reversible phase shifter according to this invention. The perspective view, FIG. 4, is a sectional view taken along the line AA in FIG. 3. In the figure, 1 is a ferrimagnetic material, 2 is a permanent magnet plate, and 3
is a 180 degree plate, 4 is the first circularly polarized wave generator, 5 is the second
circularly polarized wave generator, 6 is a magnetization conductor, 7 is a yoke,
8 is a first Faraday rotation wave element, 9 is a second Faraday rotation wave element, 10 is a dielectric, 11 is a radio wave absorber plate, 12 is a first linear polarizer, 13 is a second linear polarizer, 14 is a circular magnetic material,
15 is a magnetic screw, and 16 is a gap. In addition,
In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims (1)

[Scope of utility model registration request] A 180 degree plate formed by arranging four permanent magnet plates with N and S poles facing each other in a predetermined direction around a ferrimagnetic material whose side surfaces are coated with metal, and first and second circles. a polarized wave generator, and first and second Faraday rotary wave elements, each of which has a yoke for forming a magnetic circuit on a side surface of the ferrimagnetic material, and a magnetizing conductor is wound around the yoke or the ferrimagnetic material; , the first and second radio wave absorber plates are arranged parallel to the H-plane of a dielectric whose side surfaces are coated with metal.
A first linear polarizer, a first circularly polarized wave generator, a first Faraday rotator, a 180 degree plate, a second Faraday rotator, and a second circular polarizer are arranged along the radio wave propagation direction. In a Faraday rotary waveform reversible phase shifter configured by arranging a polarization generator and a second linear polarizer in this order, the outer periphery of the 180-degree plate is surrounded by an annular magnetic material, and the screw of the magnetic material is Attach the above-mentioned annular magnetic body so as to face each of the 180-degree permanent magnet plates. A Faraday rotary waveform reversible phase shifter characterized by forming a magnetic circuit.