JPH055401B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A flanged bushing made of a material with a low dielectric constant is placed at the intersection of a waveguide circulator so that a flange is installed on the inner wall edge line formed at the apex of an equilateral triangle. To provide a waveguide circulator in which positioning of a magnetic pin is easy by being attached to a road part and having a configuration in which a magnetic pin is inserted into a cylindrical part of a bush with a flange.

[Industrial application field]

The present invention relates to improvements in waveguide circulators.

A waveguide circulator, in which three waveguides are connected in a Y-shape and a magnetic pin is attached to the center of the intersection, is widely used as a microwave band circulator.

At this time, the characteristics of the waveguide circulator are greatly influenced by whether or not the magnetic pin is attached to the center of the intersection.

[Conventional technology]

Generally, in a waveguide circulator, a pair of first and second waveguides are arranged on the same axis, and a third waveguide is arranged in a T-shape so that it is orthogonal to the first and second waveguides. It is inserted at the intersection of the waveguides.

A conventional waveguide circulator is constructed as shown in a perspective view shown in FIG. 4 and a plan sectional view shown in FIG. 5.

4 and 5, in the waveguide circulator, one half of each of the waveguides 2, 3, and 4 is connected to the formed circulator half 1A, and one half of each of the waveguides 2, 3, and 4 is formed. Each other half is combined with the formed circulator half 1B, and a magnetic pin 7 (cylindrical and axially magnetized, for example, ferrite) stands upright at the center of the intersection 5. Installed and configured.

Each circulator half 1A, 1B is
A waveguide 2 connected to the first waveguide 31 is arranged on the same axis and has a flange on its opening side so as to be connected to a pair of first and second waveguides 31 and 32. A half body having a predetermined rectangular cross section and a half body having a predetermined rectangular cross section of the waveguide 3 connected to the second waveguide 32 are provided on the same axis.

In addition, in order to connect to the third waveguide 33 which is orthogonal to each other, a half of the waveguide 4 having a predetermined rectangular cross section with a flange on the opening side is provided in a T-shape so that the waveguides 2 and 3 are orthogonal to each other. be. Note that the inner shapes of the first waveguide 31, the second waveguide 32, and the third waveguide 33 have the same dimensions and have a predetermined rectangular shape determined by the frequency.

The waveguides 2, 3, and 4 are connected in a Y shape to form an intersection 5 in order to enhance the function of the circulator.

To be more specific, the apex angle in plan view is on the inner wall portion where waveguide 2 and waveguide 3 connect, on the opposite side from waveguide 4.
It has a protruding 120 degree triangular prism. The apex of this triangular prism becomes a ridgeline, which is an inner wall ridgeline 16A.

In addition, in order to make the cross section of each waveguide a predetermined rectangular shape that is the same as the waveguide, on the waveguide 4 side,
The inner walls of the waveguides 2 and 3 are parallel to the side walls of the protruding triangular prism and are inclined at 30 degrees with respect to the axis. Therefore, the inner wall of the connecting portion between the waveguide 2 and the waveguide 4 has an inner wall ridgeline 16B, and the inner wall ridgeline 16B has an inner wall ridgeline 16B on the inner wall of the connecting portion between the waveguide 3 and the waveguide 4.
It has 6C. These three inner wall ridgelines 16A, 16
B and 16C are located at the vertices of an equilateral triangle, and the center of gravity of the equilateral triangle formed by the inner wall ridgelines 16A, 16B, and 16C is the center of the intersection portion 5.

Further, a triangular seat 6 is provided at the center of the bottom wall of the intersection section 5 for the purpose of widening the usable frequency band.

The circulator halves 1A and 1B are combined to form waveguides 2, 3, and 4 having a rectangular cross section by aligning the side wall end faces of the respective waveguide halves 2, 3, and 4. A screw hole 1 into which a small screw 10 is screwed into a desired location on the end face of the body 1A.
1 is provided, and a screw hole 12 is provided in the circulator half body 1B opposite to this screw hole 11.

On the other hand, thin and small insulator pieces 8 made of Teflon, for example, are adhered to the upper and lower end surfaces of the magnetic pin 7 in order to electromagnetically isolate them from the bottom plate surface of the intersection portion 5.

After fixing such a magnetic pin 7 to the center position of the triangular seat 6 of the circulator half body 1A by accurately gluing or otherwise fixing it, the circulator half body 1B is aligned (a Attach the circulator half 1B to the positioning pin.
), and placed on the circulator half 1A, and fixed the circulator half 1A and the circulator half 1B with machine screws 10.

In the waveguide circulator configured as described above, for example, an incident wave transmitted from the first waveguide 31 to the waveguide 2 is emitted from the waveguide 3 and transmitted to the second waveguide 32. transmitted. Furthermore, the incident wave transmitted from the second waveguide 32 to the waveguide 3 is
The incident wave exits from the waveguide 4 and is transmitted to the third waveguide 33. The incident wave that has been transmitted from the third waveguide 33 to the waveguide 4 exits from the waveguide 2 and is transmitted to the first waveguide 33. The signal is transmitted to the waveguide 31. That is, it has the function of a circulator.

[Problem that the invention seeks to solve]

However, in the conventional waveguide circulator described above, when positioning the magnetic pin 7 at the center of the intersection part 5, the intersection part 5 is observed from above using, for example, a microscope, and the magnetic pin 7 is positioned at the center of the intersection part 5. The axis is at each vertex of the triangular seat 6 or the inner wall ridgeline 16A, 1
The distance from 6B and 16C is measured to align the magnetic pin 7 with the center of the intersection 5, and at that position, the end surface of the magnetic pin 7 is adhered to the upper end surface of the triangular seat 6.

That is, there is a problem that positioning the magnetic pin 7 is troublesome.

Furthermore, when the adhesive strength deteriorates over time, the magnetic pins 7 become displaced due to vibrations, etc., resulting in a problem in that the circulator characteristics deteriorate.

[Means for solving problems]

The above problem can be solved by the present invention, as shown in FIG.
16C is located at the vertex of an equilateral triangle, the center of this equilateral triangle is the center of the intersection, and the waveguide has a magnetic pin 7 at the center of the intersection between the circulator half 1A and the circulator half 1B. In the waveguide circulator formed by combining the
The flange of the flanged bushing 2 made of a low dielectric constant material is made of a circular flange 22 having a size that makes point contact with all the inner wall ridgelines of the intersection, and a cylindrical portion 21 standing upright at the center of one side of the circular flange 22. It is attached so as to be in contact with the ridgeline of each inner wall, and a magnetic pin 7 is closely fitted into the cylinder, and both ends of the magnetic pin are fixed to the bottom plate surface of the corresponding circulator half through an insulator piece. The problem is solved by a waveguide circulator characterized by the following.

[Effect]

Three inner wall ridgelines 16A, 16B, and 16C, which form the vertices of an equilateral triangle whose center of gravity coincides with the center of the intersection section 5, are formed in the intersection section 5 of the waveguide circulator.

Therefore, when the flanged bushing 20 is attached to the intersection portion 5 so that the outer peripheral surface of the circular flange 22 makes point contact with the three inner wall ridgelines 16A, 16B, and 16C, the center of the flanged bushing 20 and the intersection portion The centers of 5 match.

Therefore, the center of the magnetic pin 7 fitted into the cylindrical portion 21 coincides with the center of the intersection portion 5 .

That is, the positioning work of the magnetic pin 7 is easy, and there is no fear that the magnetic pin 7 will be displaced due to vibration of the waveguide circulator or the like.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a plan sectional view of one embodiment of the present invention, and FIG. 3 is a side sectional view of one embodiment of the present invention.

1 to 3, the waveguide circulator includes a circulator half body 1A in which one half of each of the waveguides 2, 3, and 4 is formed, and a circulator half body 1A formed with each of the waveguides 2, 3, and 4. The other half is combined with the formed circulator half 1B.

Magnetic pins 7 (cylindrical and axially magnetized, for example, ferrite pins) each having an insulator piece 8 attached to both end faces are configured to be attached upright in the center of the intersection 5. has been done.

Inner wall ridgelines 16A, 16B, 16C are formed at the intersection portion 5 of each circulator half body 1A, 1B, and these inner wall ridgelines 16A, 16B, 16C
The straight lines connecting these form an equilateral triangle, and its center of gravity coincides with the center of the intersection 5.

The flanged bush 20 is made of a material with a low dielectric constant,
For example, it is made of Teflon (registered trademark) or a specific synthetic resin material (trade name: Rexolite), and is composed of a thin-walled cylindrical portion 21 and a circular flange 22.

The inner diameter of the cylindrical portion 21 is slightly larger than the outer diameter of the magnetic pin 7, and has a dimension in which the magnetic pin 7 is firmly inserted, and its height is lower than the height of the magnetic pin 7.

The outer diameter of the circular flange 22 is such that it makes point contact with the inner wall ridgelines 16A, 16B, and 16C of the intersection portion 5.

Since the flanged bushing 20 is formed as described above, the circular flange 22 is aligned with the inner wall ridgeline 16.
When the flanged bush 20 is inserted into the intersection portion 5 of the circulator half 1A so as to be inscribed in the cylindrical portions A, 16B, and 16C, the axis of the cylindrical portion 21 coincides with the center of the intersection portion 5. Moreover, it goes without saying that it coincides with the center of the triangular seat 6.

The flanged bush 20 will not be displaced within the intersection 5.

Therefore, when the magnetic pin 7 is inserted into the cylindrical part 21, the axis of the magnetic pin 7 coincides with the center of the intersection part 5, and there is no fear that the position of the magnetic pin 7 will shift. Therefore, even if the circulator half 1A is combined with the circulator half 1B, this state is maintained, and there is no fear that the characteristics of the waveguide circulator will deteriorate. Note that the flanged bush 20 is made of a material with a low dielectric constant. Therefore, bushing with flange 2
Even if 0 is inserted, there is almost no negative effect on the waveguide circulator electromagnetically.

〔Effect of the invention〕

As explained above, the present invention has excellent practical effects, such as easy positioning of the magnetic pins and improved quality of characteristics of the waveguide circulator.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a plan sectional view of an embodiment of the present invention, and FIG. 3 is a perspective view of an embodiment of the present invention.
FIG. 4 is a side sectional view of the embodiment, FIG. 4 is a perspective view of the conventional example, and FIG. 5 is a plan sectional view of the conventional example. In the figure, 1A and 1B are circulator halves, 2, 3, and 4 are waveguides, 5 is a crossing section, 7 is a magnetic pin, 10 is a machine screw, 16A, 16B, 16C
20 represents an inner wall ridgeline, 20 represents a flanged bush, 21 represents a cylindrical portion, and 22 represents a circular flange.

Claims (1)

[Claims] 1 The first, second and third waveguides 2, 3, 4 are Y
Three inner wall ridgelines 16A, 16 at intersections that intersect with the shape
B, 16C are located at the vertices of an equilateral triangle, the center of this equilateral triangle is the center of the intersection, and this waveguide is connected to the circulator half 1A and the circulator half 1.
In a waveguide circulator formed by combining B and B with a magnetic pin 7 at the center of the intersection, a circular flange 22 having a size that makes point contact with all the inner wall ridgelines of the intersection and its A flanged bushing 2 made of a low dielectric constant material and consisting of a cylindrical portion 21 standing upright at the center of one side is mounted so that the flange touches each inner wall ridgeline of the intersection portion, and a magnetic pin 7 is inserted into the cylindrical portion.
A waveguide circulator characterized in that the magnetic pins are closely fitted and each end of the magnetic pin is fixed to the bottom plate surface of the corresponding circulator half via an insulator piece.