JP2010028266A - Band-pass filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band-pass filter which has a small number of components and facilitates performing the fine adjustment of a connection degree. <P>SOLUTION: The band-pass filter, in which a plurality of cylindrical resonators having a hole on the side are arranged side by side so as to communicate the holes, includes the plurality of cylindrical resonators having the holes in a square shape or an elliptic shape on the side, respectively, and a connection plate having a connection hole in the square shape or the elliptic shape and freely rotatably fixed by a prescribed fixing means between the plurality of resonators so as to communicate the connection holes and the holes. The hole provided on the resonator and the connection hole provided on the connection plate are communicated to form a communication part, and the connection degree of the plurality of resonators is changed by changing the opening area of the communication part by rotating the connection plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a band-pass filter, and more particularly to a waveguide-type band-pass filter used in a high-frequency transmission circuit.

  Conventionally, in order to obtain a low insertion loss and a high attenuation that cannot be achieved by a normal waveguide type bandpass filter, it is necessary to use a bandpass filter in which cylindrical resonators are arranged in parallel. Are known.

  For example, as shown in FIGS. 1A and 1B, such a band-pass filter 100 includes a cylindrical resonator 12 having holes 12a and 12b provided at opposite positions on the side surfaces, and a position at which the side surfaces are opposed to each other. Cylindrical resonators 14 provided in parallel so that holes 14a and 14b are provided, and the holes 14a communicate with the holes 12a of the resonator 12 through holes 16a of the coupling plate 16 described later, A coupling plate 16 provided between the resonator 14 and a hole 16a having an opening area smaller than the opening area of the hole 12a and the opening area of the hole 14a, and a movable end provided through one end face of the resonator 12 A screw shaft 20 that supports the plate 18 movably in the axial direction of the resonator 12, and is provided so as to penetrate one end face of the resonator 14, and a movable end plate 22 is movably supported in the axial direction of the resonator 14. It is configured to include a screw shaft 24 to.

  Here, the holes 12a, 12b, 14a, and 14b are provided at substantially the center in the axial direction of the cylindrical resonators 12 and 14, and the resonator 12 and the resonator 14 are coupled to each other at the flange 12d and the flange 14d. 16 and a connecting screw 26 are mechanically connected.

  In the state where the resonator 12, the resonator 14, and the coupling plate 16 are connected as described above, the hole 12a and the hole 14a are in communication with each other via the coupling hole 16a.

  The resonator 12 and the resonator 14 are mechanically coupled to the flange 28a of the waveguide 28 and the flange 30a of the waveguide 30 at the flange 12e and the flange 14e, respectively.

  In addition, as the coupling plate 16, a plurality of coupling plates having different opening areas of the holes 16a provided in the coupling plate 16 are prepared.

In the above configuration, the coupling plate 16 provided between the resonator 12 and the resonator 14 may be replaced in order to adjust the coupling degree between the resonators related to the resonator 12 and the resonator 14.

  That is, as the coupling plate 16 disposed between the resonator 12 and the resonator 14, a plurality of coupling plates 16 having a large opening area of the holes 16a are disposed, or conversely, a plurality of couplings prepared. By arranging the plate 16 having a small opening area of the hole 16a, the degree of coupling between the resonator 12 and the resonator 14 can be adjusted to a desired degree of coupling.

However, in such a bandpass filter 100, as described above, in order to adjust the degree of coupling between the resonator 12 and the resonator 14, a plurality of coupling plates 16 having different opening areas of the holes 16a must be prepared. In other words, the number of parts constituting the bandpass filter 100 increases.

In addition, the degree of coupling between the resonator 12 and the resonator 14 is adjusted by replacing one of the plurality of coupling plates 16 having a different opening area of the hole 16a, and therefore, according to the opening area of the hole 16a of the coupling plate 16. It has been pointed out that it can only be changed in steps and it is difficult to adjust to a desired degree of coupling, while the degree of coupling between the resonator 12 and the resonator 14 is finely adjusted. To do so, a large number of coupling plates 16 with slightly different opening areas of the holes 16a must be prepared. When the coupling plate 16 is created and the coupling degree is adjusted, the number of parts increases and the coupling degree increases. There was a problem that the work of adjusting was very troublesome.

The prior art that the applicant of the present application knows at the time of filing a patent is as described above and is not an invention related to a known literature, so there is no prior art information to be described.

  The present invention has been made in view of the various problems of the prior art as described above, and the object of the present invention is to reduce the number of parts and to easily perform fine adjustment of the degree of coupling. An object of the present invention is to provide a bandpass filter that can be used.

  In order to achieve the above object, the present invention provides a coupling hole provided in the center of a coupling plate and a resonator by rotating the coupling plate provided between the resonators about the center of the coupling plate as a central axis. The degree of coupling between the resonators is adjusted by continuously changing the opening area of the holes communicating between the resonators with the holes provided in the resonator.

  Therefore, according to the present invention, it is not necessary to prepare a plurality of coupling plates having different coupling hole sizes in order to adjust the coupling degree between the resonators, so that the number of parts constituting the band-pass filter can be reduced.

  Further, according to the present invention, since the coupling degree between the resonators can be continuously adjusted by rotating the coupling plate provided between the resonators, the fine coupling degree can be easily adjusted. be able to.

  Furthermore, according to the present invention, since the fine adjustment of the coupling degree between the resonators can be easily performed, the coupling degree between the resonators can be adjusted in a short time.

That is, the invention according to claim 1 of the present invention is a band-pass filter in which a plurality of cylindrical resonators having holes on the side surfaces are arranged side by side so that the holes communicate with each other. A plurality of cylindrical resonators each having an elliptical hole, and a rectangular or elliptical coupling hole, and the coupling hole and the hole communicate with each other so as to communicate with each other. A coupling plate rotatably fixed by the fixing means, and the hole provided in the resonator and the coupling hole provided in the coupling plate communicate with each other to form a communication portion, and the coupling The degree of coupling of the plurality of resonators is changed by changing the opening area of the communicating portion by rotating the plate.

  The invention according to claim 2 of the present invention is the invention according to claim 1 of the present invention, wherein the opening area of the coupling hole is equal to or smaller than the opening area of the hole. .

  Further, in the invention according to claim 3 of the present invention, in the invention according to claim 1 or 2 of the present invention, the connecting plate seems to have a disk shape or a polygonal shape. It is a thing.

  According to a fourth aspect of the present invention, in the invention according to any one of the first, second, and third aspects of the present invention, a convex portion is formed on the outer peripheral portion of the coupling plate. It is a thing.

  Since the present invention is configured as described above, there is an excellent effect that the number of parts can be reduced and fine adjustment of the coupling degree can be easily performed.

  Hereinafter, an example of an embodiment of a bandpass filter according to the present invention will be described in detail with reference to the accompanying drawings.

  In the following description, the same or equivalent components as those of the conventional bandpass filter described with reference to FIG. 1 will be described in detail using the same reference numerals as those used above. The description of the configuration and operation will be omitted as appropriate.

Here, FIG. 2 (a) shows an explanatory diagram showing the connection state between the resonators of the bandpass filter showing an example of the embodiment of the present invention, and FIG. An end view showing a cross-sectional shape taken along line II-II in FIG. 2 (a) is shown, and FIGS. 3 (a), 3 (b), and 3 (c) are developed views showing the main part of the bandpass filter. Specifically, FIG. 3A shows an end view showing a cross-sectional shape taken along line III-III in FIG. 2A, and FIG. 3B shows FIG. An end view showing a cross-sectional shape taken along line IV-IV in (a) is shown, and FIG. 3C shows an end view showing a cross-sectional shape taken along line VV in FIG. 2 (a). FIG. 4 shows the state of the hole and the coupling hole when the hole provided with the resonator communicates with the coupling hole provided in the coupling plate. Illustration there is shown a.

The band-pass filter 10 according to the present invention shown in FIGS. 2 (a), 2 (b) to 3 (a), 3 (b), and 3 (c) has a rectangular shape at a position facing a hole 12b provided on a side surface and receiving a high frequency signal. A rectangular hole 14a is provided at a position facing a cylindrical resonator 12 provided with a hole 12a and a hole 14b that is provided on a side surface and outputs a processed high-frequency signal, and the hole 14a is a coupling described later. A cylindrical resonator 14 arranged in parallel so as to communicate with the hole 12a of the resonator 12 through the coupling hole 32a of the plate 32, and provided between the resonator 12 and the resonator 14, the holes 12a and A disk-shaped coupling plate 32 having the same opening area as the hole 14a and having the same rectangular coupling hole 32a as the hole 12a and the hole 14a, and one end face of the resonator 12 are penetrated. Once established Further, a screw shaft 20 that supports the movable end plate 18 so as to be movable in the axial direction of the resonator 12 and a penetrating through one end face of the resonator 14 and a movable end plate 22 in the axial direction of the resonator 14 are provided. It has a screw shaft 24 that is movably supported.

  Here, the holes 12a, 12b, 14a, and 14b are provided at substantially the center in the axial direction of the cylindrical resonators 12 and 14, and the holes 12a, 12b, 14a, and 14b are aligned with each other. Has been placed.

  The resonator 12 is provided with a substantially disk-shaped flange 12d in which holes 12d-1, 12d-2, and 12d-3 are formed radially around the hole 12a (FIG. 3A). To see.)

  Similarly, the resonator 14 is provided with a substantially disk-shaped flange 14d in which holes 14d-1, 14d-2, and 14d-3 are formed radially around the hole 14a (FIG. 3C). ).)

  As described later, the holes 12d-1, 12d-2, 12d-3 drilled in the flange 12d and the holes 14d-1, 14d-2, 14d-3 drilled in the flange 14d include: A connecting screw 26 that is a connector for connecting the resonator 12 and the resonator 14 via the coupling plate 32 is inserted, and the resonator 12 and the resonator 14 are screw-coupled via the coupling plate 32. Become.

  The coupling plate 32 has a diameter L2 larger than the diameter L1 of the flange 12d provided in the resonator 12 and the flange 14d provided in the resonator 14, and a rectangular coupling hole 32a is formed at the center thereof. Long holes 32b, 32c, and 32d that are provided and have an arc shape through which the connecting screw 26 can be inserted are formed on the edge side (see FIG. 3B).

  The resonator 12, the resonator 14, and the coupling plate 32 include a center of the hole 12 a provided in the resonator 12, a center of the coupling hole 32 a provided in the coupling plate 32, and a hole 14 a provided in the resonator 14. In the state where the hole 12a, the hole 14a and the coupling hole 32a communicate with each other, the connecting screw 26 is inserted into the hole 12d-1, the long hole 32b and the hole 14d-1, The connecting screw 26 is inserted into the hole 12d-2, the long hole 32c, and the hole 14d-2, and the connecting screw 26 is inserted into the hole 12d-3, the long hole 32d, and the hole 14-3, and the coupling plate The resonator 12 and the resonator 14 are mechanically connected to each other through a screw connection 32.

  At this time, the communicating hole 12a and the coupling hole 32a are coupled so that the long side of the rectangular hole 12a and the long side of the rectangular coupling hole 32a are orthogonal to each other, and the coupling hole is in a communicating state. 32a and the hole 14a are connected so that the long side of the rectangular coupling hole 32a and the long side of the rectangular hole 14a are orthogonal to each other (see FIG. 4).

  In the present embodiment, the long holes 32b, 32c, and 32d provided in the coupling plate 32 are set to a length that allows the coupling plate 32 to rotate by ¼ rotation at the connecting portion between the flange 12d and the flange 14d. Has been.

In the above configuration, the coupling plate 32 provided between the resonator 12 and the resonator 14 may be rotated in order to adjust the degree of coupling between the resonator 12 and the resonator 14.

  That is, when the coupling plate 32 is rotated, the rectangular coupling hole 32a provided in the coupling plate 32 is also rotated, so that the coupling hole 32a and the hole 12a provided in the resonator 12 and the resonator 14 are provided. The opening area of the communicating part with the formed hole 14a can be gradually changed (see FIGS. 5A, 5B, and 5C).

  That is, the holes 12a and 14a provided in the resonator 12 and the resonator 14, respectively, and the coupling hole 32a provided in the coupling plate 32 loosen the three connecting screws 26 from the state shown in FIG. When the coupling plate 32 is rotated in the direction of arrow A after the coupling plate 32 is rotatable, for example, the state shown in FIG. 5B is obtained, and the opening area of the communication portion between the hole 12a and the hole 14a and the coupling hole 32a is obtained. Increases continuously, and the degree of coupling between the resonator 12 and the resonator 14 increases continuously.

  Further, when the coupling plate 32 is rotated in the direction of arrow A from the state shown in FIG. 5B, the state shown in FIG. 5C is obtained, and the opening area of the communication portion between the hole 12a and the hole 14a and the coupling hole 32a is further increased. As a result, the degree of coupling between the resonator 12 and the resonator 14 is further increased.

  On the contrary, when the coupling plate 32 is rotated in the direction of arrow B from the state shown in FIG. 5C, the state shown in FIG. 5B is obtained, and the communication portion between the hole 12a and the hole 14a and the coupling hole 32 is changed. The opening area is continuously reduced, and the degree of coupling between the resonator 12 and the resonator 14 is continuously reduced.

  Furthermore, when the coupling plate 32 is rotated in the direction of arrow B from the state shown in FIG. 5B, the state shown in FIG. 5A is obtained, and the opening area of the communication portion between the hole 12a and the hole 14a and the coupling hole 32a is further increased. As a result, the degree of coupling between the resonator 12 and the resonator 14 is further reduced.

  As described above, the three coupling screws 26 are loosened so that the coupling plate 32 can be rotated, and the coupling plate 32 is rotated to obtain a desired degree of coupling between the resonator 12 and the resonator 14. If so, the resonator 12, the resonator 14 and the coupling plate 32 may be fixed again by tightening the connecting screw 26 at that position.

As described above, according to the bandpass filter 10 according to the present invention, the coupling plate 32 is rotated to adjust the degree of coupling between the resonator 12 and the resonator 14, and thus the bandpass filter 10 is configured. The number of parts is small.

  Further, according to the bandpass filter 10 of the present invention, the coupling plate 32 is rotated to adjust the coupling degree between the resonator 12 and the resonator 14, so that the coupling degree between the resonator 12 and the resonator 14 is increased. It becomes possible to adjust by changing continuously, it becomes possible to easily adjust the degree of coupling, and a desired degree of coupling can be obtained in a short time.

The above-described embodiment can be modified as shown in the following (1) to (7).

  (1) In the above-described embodiment, the hole 12a of the resonator 12, the hole 14a of the resonator 14, and the coupling hole 32a of the coupling plate 32 are rectangular shapes having the same opening area, but the present invention is not limited to this. Of course, for example, as shown in FIGS. 6A, 6B, 6C, and 6D, each of the resonator 12, the resonator 14, and the coupling plate 32 has an elliptical shape having the same opening area. A hole 12aa, a hole 14aa, and a coupling hole 32aa may be provided to connect the resonator 12, the resonator 14, and the coupling plate 32 together.

  At this time, in the initial state, the elliptical hole 12aa, hole 14aa, and coupling hole 32aa are, for example, the resonator 12 and the long axis of the hole 12aa and the hole 14aa and the long axis of the coupling hole 32aa orthogonal to each other. The resonator 14 and the coupling plate 32 may be connected.

  Further, the hole 12a, the hole 14a, and the coupling hole 32a are not limited to a rectangular shape or an elliptical shape, but various shapes other than a regular circular shape, that is, a triangular shape, a rectangular shape, a rhombus shape, a trapezoidal shape, Any square shape or polygonal shape including a polygonal shape such as a pentagonal shape may be used.

  (2) In the above-described embodiment, the hole 12a of the resonator 12, the hole 14a of the resonator 14, and the coupling hole 32a of the coupling plate 32 are rectangular shapes having the same opening area, but are not limited thereto. Of course, it is not a thing, and as shown to Fig.7 (a) (b) (c) (d), by making the short side of the coupling hole 32a small, it is more than the hole 12a and the hole 14a in the coupling plate 32. A rectangular coupling hole 32ab having a small opening area may be provided.

  If the long side of the coupling hole is shortened in order to reduce the opening area, the coupling hole becomes close to a square, and even if the coupling plate 32 having such a coupling hole is rotated, the holes 12a and 14a and the coupling hole Since the change in the opening area of the communication portion is small, adjustment of the coupling degree between the resonator 12 and the resonator 14 by the coupling plate 32 having such a coupling hole reduces the range of coupling degree that can be adjusted.

  (3) In the embodiment described above, the coupling plate 32 provided between the resonator 12 and the resonator 14 is rotated to adjust the degree of coupling between the resonator 12 and the resonator 14. However, as in the prior art, a plurality of coupling plates 32 provided with coupling holes having different opening areas are prepared, the coupling plate 32 is replaced, and the replaced coupling plate 32 is rotated to rotate the resonator 12 and the resonator 14. The degree of coupling may be adjusted.

  When the coupling degree between the resonators is adjusted in this way, the coupling degree can be continuously adjusted in a wider range.

  (4) In the above-described embodiment, the coupling plate 32 adjusts the degree of coupling between the two resonators of the resonator 12 and the resonator 14, but three or more resonators are arranged in parallel. Of course, in the band-pass filter, the degree of coupling between adjacent resonators can be adjusted in the same manner.

At that time, for example, the resonator 12, the resonator 14 and to connect the resonator 34, as shown in FIG. 10 (a), the center axis _{O 1} of the resonator 12, the center axis _{O 2} of the resonator 14 In addition, the resonators may be connected so that the central axis O ₃ of the resonator 34 exists on the same plane P ₁ , and as shown in FIG. 10B, the central axis O ₁ of the resonator 12 each resonator so that the plane P ₃ in which the central axis O ₂ of the plane P ₂ and the resonator 14 and the central axis O ₂ is present in the resonator 14 and the central axis O ₃ of the resonator 34 is present has a predetermined angle May be connected.

  (5) In the above-described embodiment, the coupling plate 32 has a disk shape larger in diameter than the flanges provided in the resonator 12 and the resonator 14 so that the coupling plate 32 can be easily rotated. Of course, it is not a thing, and as shown in FIGS. 8A, 8B and 8C, the coupling plate 32 is rotated by making the coupling plate 32 into a polygonal shape or providing a convex portion on the outer peripheral portion. It is good also as an easy shape.

  (6) In the above-described embodiment, the resonator 12, the resonator 14, and the coupling plate 32 include the center of the hole 12 a provided in the resonator 12 and the center of the coupling hole 32 a provided in the coupling plate 32. The center of the hole 14a provided in the resonator 14 is aligned with the center, and the coupling plate 32 is provided with the long holes 32b, 32c, and 32d so that the coupling plate 32 can be rotated 1/4. 9, when the rectangular hole 12a (14a) and the coupling hole 32a are shifted in different directions, the long holes 32e and 32f are provided to rotate the coupling plate by 1/2. You may do it.

  (7) You may make it combine suitably the embodiment shown above and the modification shown in said (1) thru | or (6).

  The present invention can be used as a waveguide-type bandpass filter used in a high-frequency transmission circuit.

FIG. 1A is a schematic perspective view illustrating a conventional band-pass filter, and FIG. 1B is an end view illustrating a cross-sectional shape taken along line II in FIG. 1A. FIG. 2A is an explanatory view showing a connection state between the resonators of the bandpass filter according to the present invention, and FIG. 2B shows a cross-sectional shape taken along line II-II in FIG. It is an end view. FIGS. 3A, 3B, and 3C are developed views showing the main part of the band-pass filter according to the present invention. Specifically, FIG. 3A is a cross-sectional view taken along line III-III in FIG. FIG. 3B is an end view showing a cross-sectional shape taken along line, and FIG. 3B is an end view showing a cross-sectional shape taken along line IV-IV in FIG. 2A, and FIG. It is an end view which shows the cross-sectional shape by the VV line of 2 (a). FIG. 4 is an explanatory diagram showing a state of the hole and the coupling hole when the hole provided with the resonator communicates with the coupling hole provided in the coupling plate. FIGS. 5A, 5B, and 5C are explanatory views showing the opening area of the connecting portion between the hole provided in the resonator and the coupling hole provided in the coupling plate, which is changed by rotating the coupling plate. is there. 6 (a), 6 (b), 6 (c), and 6 (d) are explanatory diagrams showing a modification of the bandpass filter according to the present invention. FIG. 6 (a) corresponds to FIG. 3 (a), and FIG. b corresponds to FIG. 3B, FIG. 6C corresponds to FIG. 3C, and FIG. 6D corresponds to FIG. 7 (a), (b), (c), and (d) are explanatory views showing modifications of the bandpass filter according to the present invention. FIG. 7 (a) corresponds to FIG. 3 (a), and FIG. b corresponds to FIG. 3B, FIG. 7C corresponds to FIG. 3C, FIG. 7D corresponds to FIG. 5A, and FIG. 7E corresponds to FIG. Corresponds to (c). FIGS. 8A, 8B and 8C are explanatory views showing a modification of the bandpass filter according to the present invention. FIG. 9 is an explanatory view showing a modification of the bandpass filter according to the present invention. FIGS. 10A and 10B are explanatory views showing a modification of the bandpass filter according to the present invention.

Explanation of symbols

10, 100 Bandpass filter 12, 14, 34 Resonator 12a, 12aa, 12b, 14a, 14aa, 14b, 12d-1, 12d-2, 12d-3, 14d-1, 14d-2, 14d-3 Hole 12d 12e, 14d, 14e, 28a, 30a Flange 16, 32 Coupling plate 32a, 32aa, 32ab Coupling hole 32b, 32c, 32d, 32e, 32f Slotted hole 18, 22 Movable end plate 20, 24 Screw shaft 26 Coupling screw 28, 30 Waveguide

Claims (4)

In a bandpass filter in which a plurality of cylindrical resonators having holes on the side surfaces are arranged side by side so that the holes communicate with each other,
A plurality of cylindrical resonators each having a square or elliptical hole on its side;
A coupling plate having a rectangular or elliptical coupling hole and rotatably fixed by a predetermined fixing means between the plurality of resonators so that the coupling hole and the hole communicate with each other;
The hole provided in the resonator and the coupling hole provided in the coupling plate communicate with each other to form a communication portion, and the opening area of the communication portion is changed by rotating the coupling plate. A band-pass filter that changes the degree of coupling of the plurality of resonators. The bandpass filter according to claim 1, wherein
An opening area of the coupling hole is equal to or less than an opening area of the hole. The bandpass filter according to any one of claims 1 and 2,
The band-pass filter, wherein the coupling plate has a disc shape or a polygonal shape. The band-pass filter according to any one of claims 1, 2, or 3,
The coupling plate has a convex portion formed on an outer peripheral portion.

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