JPS61137401A - Strip line type circulator - Google Patents

Abstract

PURPOSE:To obtain an excellent mutual contact state by interposing a flexible external conductor plate between ferrite and a magnet, clamping and fixing the plate on an end surface of an external conductor one over the other, and bringing the plate into the end surface of the external conductor securely with clamping pressure applied to the plate. CONSTITUTION:A circulator has a shallow recessed part 2, whose depth is so determined that the end surface of the external conductor 1 is level with the end surface 7A of the ferrite 7. The flexible external conductor plate 17 is arranged in contact with those end surfaces 1A and 7A. One magnet 12 is mounted on the flexible external conductor plate 17 corresponding to the ferrite 7. A cover 18 is placed on the flexible external conductor plate 17 so as to contain the magnet 12, and the external edge part of the cover 18 on the end surface 1A of the external conductor 1 across the flexible external conductor plate 17 is clamped and fixed to the external conductor 1 with a clamping screw 19. Consequently, the mutual contact part 14 between the flexible external conductor plate 17 and external conductor 1 is placed in an excellent contact state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stripline circulator used in the microwave band.

[Prior art] This type of conventional stripline circulator is
As shown in FIG. 6, recesses 2 and 3 are provided on the upper and lower surfaces of an external conductor 1 made of non-magnetic metal such as aluminum, and a boundary wall 4 is provided between both recesses 2 and 3. A Y-shaped strip line 5 is disposed on the boundary wall 4, sandwiched between ferrites 6 and 7, and another external line made of non-magnetic metal such as aluminum is placed in the recess 2 so as to overlap the upper ferrite 7. The conductor 8 is fitted, the cylindrical outer conductors 1 and 8 are fastened with the fastening screws 9, a recess 10 is provided on the upper surface of the outer conductor 8, and both ferrites 6 and 7 are provided in the outward facing recesses 3 and 10, respectively. Magnets 11 and 12 for applying DC magnets were respectively fitted and disposed, and each terminal 13 of the strip line 5 had a structure in which the external conductor 1 was insulated and led out.

In such a stripline circulator, the mutual contact 14 of the outer conductor 1.8 and the ferrite 7
The mutual contact portion 15 between the ferrite 6 and the outer conductor 1, and the mutual contact portion 16 between the ferrite 6 and the outer conductor 1 have electrical characteristics,
In particular, it is necessary to improve the contact since it has a negative effect on insertion loss.

[Problems to be Solved by the Invention] Therefore, it is necessary to improve the accuracy of the dimension A of the mutual contact portion 14 and to improve the flatness of the mutual contact portions 15 and 16, which has the disadvantage of increasing processing cost. there were. Furthermore, in the case of mass-produced products, these defects significantly increase the number of man-hours and cause a decrease in yield.

An object of the present invention is to provide a stripline circulator that can improve electrical performance without requiring high-precision processing, reduce costs, and improve yield.

[Means for Solving the Problems] The structure of the present invention that achieves the above object will be explained with reference to FIGS. 1 and 2, which correspond to embodiments. , a recess 2 is provided on one side of the external conductor 1, and a strip line 5 is accommodated in the recess 2 by being sandwiched between ferrites 6.7,
A flexible outer conductor plate 17 is disposed on the end face 1A of the outer conductor 1 on the side where the recess 2 is present, in contact with the end face 1A and the end face 7A of the ferrite 7. The plate 17 is fastened to the end surface 1A of the outer conductor 1, and one magnet 12 for applying a DC magnetic field to the ferrite 6.7 is disposed on the flexible outer conductor plate 17. On the other side of 1 is the other magnet 11 that applies a DC magnetic field to the ferrite 6°7.
is arranged, and a pressure means 20 for pressing the magnet 11 against the flexible outer conductor 17 is provided on the one magnet 12 side.

[Operation of the invention] In such a circulator, the flexible outer conductor plate 17 is placed on the end surface 1A of the outer conductor 1 and the clamping is fixed, so that the connection between the outer conductor 1 and the flexible outer conductor plate 17 is Contact is assured. Further, a flexible outer conductor plate 17 is interposed between the ferrite 7 and the magnet 12, and the magnet 12 is pressed against the flexible outer conductor plate 17 by the pressurizing means 20.
Since the sides are pressurized, the contact between the flexible outer conductor plate 17 and the ferrite 7 and the contact between the ferrite 6 and the outer conductor 1 are ensured.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2. Note that parts corresponding to those in FIG. 6 described above are designated by the same reference numerals. In the strip line type circulator of this embodiment, the depth of the recess 2 is made shallower than that of the conventional one shown in FIG. ing. A flexible outer conductor plate 17 is disposed in contact with these end surfaces 1A and 7A. As the flexible outer conductor plate 17, an aluminum plate having a thickness of, for example, about 0.03 to 0.3 m is used.

This flexible outer conductor plate 1 corresponds to the ferrite 7.
One magnet 12 is placed on top of the magnet 7 .

A cover 18 is placed over the flexible outer conductor plate 17 so as to accommodate the magnet 12, and the end surface 1 of the outer conductor 1 is covered with a cover 18.
The outer edge of the cover 18, which is placed over A with a flexible outer conductor plate 17 interposed therebetween, is fastened to the outer conductor 1 with a tightening screw 19. Thereby, the mutual contact portion 14 between the flexible outer conductor plate 17 and the outer conductor 1 is brought into good contact. A pressure means 20 made of an O-ring is interposed between the cover 18 and the magnet 12 to press the magnet 12 toward the flexible outer conductor plate 17. When the magnet 12 is pressed against the flexible outer conductor plate 17 by the pressing means 20 in this way, the plate 17 is bent and pressed against the end surface 7A of the ferrite 7, and the ferrite 6 is pressed against the outer conductor 1, causing each The mutual contacts 15,16 are in good contact.

FIG. 3 shows an example of the isolation characteristics of the circulator according to the present invention.

FIG. 4 is a comparison diagram of an example of the insertion loss characteristic of the circulator according to the present invention and the insertion loss characteristic of the conventional circulator shown in FIG. According to the invention, each mutual contact 14
, 15.16, the insertion loss was proven to be smaller than before.

FIG. 5 shows an example of the VS14R characteristics of the circulator according to the present invention.

Note that the pressurizing means 20 is not limited to an O-ring. For example, a screw may be screwed back into the cover 18 and the magnet 12 may be attached to the tip of the screw.
may be pressurized, or a spring may be interposed.

[Effects of the Invention] As explained above, in the strip line type circulator according to the present invention, a flexible outer conductor plate is interposed between the ferrite and the magnet, and the plate is overlapped with the end face of the outer conductor and tightened. Since the plate is fixed, the pressure applied to the plate ensures that the plate is brought into contact with the end surface of the outer conductor, and a good state of mutual contact can be obtained. In addition, since the magnet is pressurized against the plate side by a pressurizing means,
The plate is bent and pressed against the end face of one ferrite, and the other ferrite is pressed against the external conductor, so that good mutual contact can be obtained at each mutual contact portion. Therefore, according to the present invention, insertion loss can be reduced. Further, according to the present invention, since a flexible outer conductor is used, processing accuracy is no longer strictly required, costs can be reduced, and small stoppage can be improved.

[Brief explanation of drawings]

1 and 2 are a cross-sectional view and a plan view of an embodiment of the stripline circulator according to the present invention, and FIGS. 3 to 5 show the isolation, insertion loss, and VSWR of the circulator according to the present invention. Each characteristic diagram, FIG. 6, is a cross-sectional view of a conventional stripline circulator. DESCRIPTION OF SYMBOLS 1... External conductor, 1A... End surface, 2... Recessed part, 5
...Strip line, 6,7...Ferrite,
11.12... Magnet, 14.15.16... Mutual contact portion, 17... Flexible outer conductor plate, 18...
Cover, 19//A Yuishifuyu 5th figure name

Claims (1)

[Claims] A recess is provided on one side of the outer conductor, a strip line is housed in the recess by being sandwiched between ferrite, and an end face of the outer conductor on the side where the recess is present is provided with a recess between the end face and the end face of the ferrite. A flexible outer conductor plate is disposed in contact with the ferrite, and the flexible outer conductor plate is fastened and fixed to the end face of the outer conductor, and a DC magnetic field is applied to the ferrite on the flexible outer conductor plate. A magnet for applying a DC magnetic field to the ferrite is disposed on the other side of the outer conductor, and another magnet for applying a DC magnetic field to the ferrite is disposed on the other side of the outer conductor, and the magnet is attached to the flexible outer conductor on the one magnet side. A strip line type circulator characterized by being provided with pressure means for pressing.