JPH0758502A - Branching device - Google Patents

Abstract

PURPOSE:To execute mount of a short-circuit member without special requirement of precision by fitting the short-circuit member to a dielectric ring and adopting a structure that the ring is inserted in a main waveguide and fixed therein. CONSTITUTION:A coupling hole 2 to extract an electromagnetic wave at a low frequency band provided to a circumferential face of a main waveguide 1 is connected to a rectangular branch waveguide 3. Furthermore, a sub waveguide 6 of a shape passing an electromagnetic wave at a high frequency band is provided and a step conversion section 5 to match the sub waveguide 6 and the main waveguide 1 is provided. Moreover, a short-circuit plate 4 is provided in the main waveguide 1 to reflect an electromagnetic wave at a low frequency band and to lead it to the rectangular branch waveguide 3 via the coupling hole 2. Then the short-circuit plate 4 is fitted to a dielectric ring 7 and inserted in the main waveguide 1 and fixed by a screw 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demultiplexer, and more particularly to a demultiplexer for demultiplexing electromagnetic waves of polarized waves orthogonal to each other in a plurality of frequency bands.

[0002]

2. Description of the Related Art Conventionally, a demultiplexer of this type as shown in FIG. 4 has been used. That is, the circular main waveguide 1 for introducing the low frequency electromagnetic wave f1 and the high frequency electromagnetic wave f2, the coupling hole 2 provided on the circumferential surface of the main waveguide for branching the electromagnetic wave f1, and the electromagnetic wave f1. And the electromagnetic wave f1
A branch waveguide 3 for taking out, a sub-waveguide 6 connected in series to the main waveguide 1, and having a shape to be cut off with respect to the electromagnetic wave f2, the main waveguide 1 and the sub-waveguide 6. Between the step conversion section 5 for matching with the electromagnetic wave f2, the coupling hole 2 in the main waveguide 1, and the step conversion section 5 in a direction parallel to the polarization of the electromagnetic wave f1. And the short-circuit plate 4 for the electromagnetic wave f1 provided in the.

The short-circuit plate 4 is fixed inside the main waveguide 1, but if electrical contact is insufficient, resonance or the like is likely to occur. Therefore, conventionally, the short-circuit plate 4 has been fixed by press-fitting work or soldering work.

[0004]

This conventional method of mounting a short-circuit plate requires high electrical contact as described above,
Further, the mounting error of the short-circuit plate with respect to the tube axis has a great influence on the cross polarization characteristics, and therefore, high manufacturing accuracy is required, and there is a drawback that the cost becomes high.

Further, as mentioned above, this short-circuit plate is usually
Since it is fixed to the main waveguide by press fitting work and soldering work,
No post-manufacturing adjustments were possible.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a duplexer having a short circuit plate which is low in cost and easy to adjust after manufacturing.

[0007]

According to the present invention, a circular main waveguide for propagating electromagnetic waves of polarized waves orthogonal to each other in a plurality of frequency bands, and a coupling hole is formed on the circumferential surface of the main waveguide. Demultiplexing including a branching waveguide connected to each other to pass one of the plurality of frequency bands, and a short-circuit member provided in the main waveguide in a direction parallel to the polarization of the electromagnetic wave of the one frequency band. A demultiplexer is provided that includes a ring-shaped dielectric that supports the short-circuit member and is fitted to the inner peripheral surface of the main waveguide.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the structure of an embodiment of the present invention, and the same portions as those in FIG. 4 are designated by the same reference numerals. In the figure, reference numeral 1 is a main waveguide, and 2 is a coupling hole provided on the peripheral surface of the main waveguide 1 for extracting an electromagnetic wave of a low frequency band, which is connected to the rectangular branch waveguide 3.

Reference numeral 6 denotes a sub-waveguide connected in series with the main waveguide 1 and having a shape for cutting off low frequencies and allowing passage of electromagnetic waves in a high frequency band. The sub-waveguide 6 and the main waveguide 1
A step conversion unit 5 is provided for matching with.

Reference numeral 4 is a short-circuit plate provided in the main waveguide 1 for reflecting an electromagnetic wave in a low frequency band and guiding it to the rectangular branch waveguide 3 through the coupling hole 2. The short-circuit plate 4 is attached to a dielectric ring 7, fitted inside the main waveguide 1 as shown in the figure, and fixed by a screw 8.

FIG. 2 shows the details of the short-circuit plate 4 and the dielectric ring 7 in FIG. 1, and both side edges of the short-circuit plate 4 are fitted into and supported by a groove portion provided in advance on the inner peripheral surface of the ring 7. It has become. After fitting the ring 7 to the inner peripheral surface of the circular main waveguide 1, the ring 7 is fixed with screws 8.

FIG. 3 is a view showing another embodiment of the present invention, in which two short-circuit rods 9 are used in place of the short-circuit plate 4 of FIG. The short-circuit rod 9 is attached, the ring 7 is fitted to the inner peripheral surface of the main waveguide 1, and screwed. At least one short-circuit rod 9 is sufficient.

[0014]

As described above, according to the present invention, the short-circuit member is attached to the dielectric ring, and the ring is fitted and fixed in the main waveguide, so that high manufacturing precision is conventionally required. There is an effect that the short circuit member can be attached without requiring special precision. In addition, there is an effect that it becomes easy to correct the axial deviation between the short-circuit member and the main waveguide.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a view showing details of mounting the short-circuit plate of FIG.

FIG. 3 is a diagram showing a part of details of another embodiment of the present invention.

FIG. 4 is a perspective view of a conventional duplexer.

[Explanation of symbols]

 1 Main Waveguide 2 Coupling Hole 3 Rectangular Branch Waveguide 4 Short Circuit Plate 5 Step Converter 6 Sub Waveguide 7 Dielectric Ring 8 Ring Mounting Screw 9 Shorting Rod

Claims (3)

[Claims] 1. A circular main waveguide for propagating electromagnetic waves of polarizations orthogonal to each other in a plurality of frequency bands, and one of the plurality of frequency bands connected to a circumferential surface of the main waveguide through a coupling hole.
A branching waveguide that allows one to pass therethrough, and a demultiplexer including a short-circuit member provided in the main waveguide in a direction parallel to the polarization of the electromagnetic wave of the one frequency band, the demultiplexer supporting the short-circuit member. Then, the duplexer including a ring-shaped dielectric body fitted to the inner peripheral surface of the main waveguide. 2. The duplexer according to claim 1, wherein the short-circuit member is a short-circuit plate. 3. The duplexer according to claim 1, wherein the short-circuit member is a short-circuit rod.