JPH0722882Y2 - Polarization plane switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a polarization plane switch utilizing the Faraday effect of ferrite, and more specifically to a polarization plane switch having a waveguide divided into two parts. is there. The polarization plane switch is a device that rotates the plane of polarization of electromagnetic waves traveling in linear polarization by using the Faraday effect of ferrite, and is used in satellite broadcast receiving systems and the like.

[Prior Art] A conventional polarization plane switcher has an input impedance converter, a ferrite rod, and an output impedance converter arranged in a waveguide system, and a coil wound around a bobbin is placed outside the ferrite rod. It is arranged such that both sides are held by magnetic yokes and incorporated into a waveguide system for receiving satellite broadcasts. In this case, the waveguide system connects the circular waveguide on the input side to the waveguide with a small diameter (non-magnetic metal tube) via the magnetic yoke on one side at the polarization plane switcher, and the rectangular system on the output side. The waveguide has a structure connected to the other magnetic yoke.

[Problems to be Solved by the Invention] In the prior art, since the polarization plane switch and the waveguide system mounting the same are separate parts, the number of parts is large and the structure is complicated.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a polarization plane switcher having a small number of parts, a simple structure, and easy mounting on a waveguide system.

[Means for Solving the Problems] In order to solve the above problems, the present invention has devised the shape of the waveguide in particular. The waveguide used in the present invention has a two-divided structure, one of which is a circular waveguide portion on the input side, and the other of which is a central small-diameter waveguide portion and a rectangular waveguide portion on the output side. Both can be connected by screwing. A ferrite rod and an input / output impedance converter are inserted and fixed in the central small-diameter waveguide section, and a coil is provided on the outer peripheral portion of the central small-diameter waveguide section. Then, the circular waveguide section and the central small-diameter waveguide section are coupled and fixed by screwing.

To facilitate coupling with other waveguide systems, the ends of the circular waveguide section and the rectangular waveguide section have a flange structure.

[Operation] The circular waveguide portion and the rectangular waveguide portion are connected to the input-side and output-side waveguide systems at their ends, respectively. The small-diameter waveguide portion in the center serves as a frame for the coil while having a function of holding the ferrite rod and the input / output impedance converter.

[Embodiment] FIG. 1 is an exploded perspective view of a polarization plane switching device according to the present invention, FIG. 2 is its sectional view, and FIG. 3 is a sectional view after assembly. An input impedance converter 12 and an output impedance converter 14 are arranged on both ends of a cylindrical microwave ferrite rod 10, respectively, and incorporated in a waveguide. Both the input impedance converter 12 and the output impedance converter 14 are made of a dielectric material, and have a shape in which a large diameter portion having the same outer diameter as the ferrite rod 10 and a small diameter portion smaller than that are continuous. In particular, the output impedance converter 14 has a resistive film 15 at the center.
It is in a state of sandwiching.

The main difference between the present invention and the prior art is the structure of the waveguide. The waveguide has a two-part structure, one of which is a circular waveguide portion 18 having an input side flange 18a, and the other is a rectangular waveguide portion 22 having a central small-diameter waveguide portion 20 and an output side flange 22a. It is an integrated product with. These are made of aluminum or the like. The central small-diameter waveguide section 20 has an inner diameter into which the ferrite rod 10, the input impedance converter 12, and the output impedance converter 14 just fit. A female screw portion 18b is formed around the coupling opening on the end surface of the circular waveguide portion 18 on the opposite side to the flange 18a, and a male screw portion 20a screwed to the female screw portion 18b is formed at the tip of the central small-diameter waveguide portion 20. Has been formed.

The input impedance converter is provided in the central small-diameter waveguide section 20.
12, the ferrite rod 10 and the output impedance converter 14 are fitted, the resistance film 15 is adjusted so as to be parallel to the long side of the rectangular waveguide section 22, and fixed by an adhesive. Further, the insulating film 24 is provided on the outer peripheral surface of the central small-diameter waveguide portion 20, the step portion continuous with the outer peripheral surface, and the end surface of the circular waveguide portion 18. The insulating film 24 is 0.
An insulating coating with a thickness of 2 to 0.3 mm may be used.

Here, the coil 26 is formed by winding a cement wire around another winding frame, hardening the cement wire, and then removing it from the winding frame. The coil 26 is mounted on the outer circumference of the central small-diameter waveguide section 20.

Then, the circular waveguide section 18 and the central small-diameter waveguide section 20 are coupled and fixed by a screwing method.

The microwave input from the circular waveguide 18 on the input side is concentrated on the input impedance converter 12, and the polarization plane is rotated by the Faraday effect due to the magnetic field generated by the coil 26 in the process of passing through the microwave ferrite rod 10. A component perpendicular to the resistance film 15 is output from the output impedance converter 14, and is output through the rectangular waveguide section 22 on the output side. The installation of this device in the waveguide system requires flanges 18a and 22a, respectively.
Can be done easily using.

[Effects of the Invention] As described above, the present invention holds the ferrite rod and the input / output impedance converter by the central small-diameter waveguide portion between the input and output waveguide portions, and also has a coil on the outer peripheral portion thereof. Since it is mounted, a bobbin, a magnetic yoke, etc., which are required in the conventional structure, are unnecessary, the number of parts is reduced, and the structure is simplified. In addition, the number of assembling steps is also reduced accordingly.

Since the present invention divides between the circular waveguide portion and the central small-diameter waveguide portion, the insertion direction of the ferrite rod and the input / output impedance converter can be easily aligned, and the assembly can be performed accurately and easily.

Further, if the input and output ends have a structure with a flange, it can be connected to an external waveguide system very easily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a polarization plane switching device according to the present invention, and FIG.
FIG. 3 is a sectional view thereof, and FIG. 3 is a sectional view after the assembly. 10 …… Microwave ferrite rod, 12 …… Input impedance converter, 14 …… Output impedance converter, 15 ……
Resistive film, 18 ... Circular waveguide, 18a ... Flange, 20 ...
… Central small-diameter waveguide section, 22… Rectangular waveguide section, 22a… Flange, 24… Insulating film, 26… Coil.

Claims (1)

[Scope of utility model registration request] 1. A polarization plane switching device having an input impedance converter, a ferrite rod, an output impedance converter arranged in a waveguide, and means for applying a magnetic field to the ferrite rod, wherein the waveguide has a two-part structure. None, one is a circular waveguide part on the input side, the other is an integrated product of the central small-diameter waveguide part and the rectangular waveguide part on the output side, and the input impedance conversion is performed in the central small-diameter waveguide part. , A ferrite rod, and an output impedance converter are inserted and fixed, a coil is provided on the outer peripheral part of the central small-diameter waveguide section, and the circular waveguide section on the input side and the central small-diameter waveguide section are screwed. Polarization plane switch characterized by being coupled by a plug-in method.