CN111540989A - Filter with negative coupling structure and manufacturing method thereof - Google Patents
Filter with negative coupling structure and manufacturing method thereof Download PDFInfo
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- CN111540989A CN111540989A CN202010460104.6A CN202010460104A CN111540989A CN 111540989 A CN111540989 A CN 111540989A CN 202010460104 A CN202010460104 A CN 202010460104A CN 111540989 A CN111540989 A CN 111540989A
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- negative coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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Abstract
According to the filter with the negative coupling structure, the surface of the filter body is provided with the first negative coupling hole, the bottom wall of the first negative coupling hole is provided with the second negative coupling hole penetrating through the filter body, the inner wall surfaces of the first negative coupling hole and the second negative coupling hole and the surface of the filter body are covered with the conductive layer, the bottom wall of the first negative coupling hole is provided with the isolating ring surrounding the opening part of the second negative coupling hole, the isolating ring penetrates through the conductive layer on the bottom wall of the first negative coupling hole, the isolating ring is filled with the insulating material, the capacitive coupling of the filter with the negative coupling structure can be realized through the matching of the first negative coupling hole, the second negative coupling hole and the isolating ring, and when the filter is installed, the first negative coupling hole can play a role in protecting the isolating ring, so that the isolating ring is not easy to damage; the invention also provides a manufacturing method for manufacturing the filter with the negative coupling structure, which is simple and practical, has high yield and is suitable for mass production.
Description
Technical Field
The application relates to the field of filter manufacturing, in particular to a filter with a negative coupling structure and a manufacturing method thereof.
Background
The traditional filter has the defects of large volume, high loss, low dielectric constant and the like, and cannot perfectly meet the arrival of the 5G communication era. Therefore, the dielectric waveguide filter has the advantages that the dielectric constant of the dielectric material is higher and the volume is smaller under the same resonance frequency. With the continuous improvement of the performance of a base station, the performance requirements on a filter are higher and higher, the traditional dielectric waveguide filter mostly adopts an inductive coupling mode, and is difficult to meet the specific electrical performance requirements such as the suppression of the near end of the frequency band of the filter, and in order to solve the problem, a dielectric filter adopting capacitive coupling appears in the market, for example, international patent application WO2018148905 a1 discloses a dielectric filter which realizes the capacitive coupling between resonant cavities by arranging a through hole and a partition ring on a dielectric block, but the partition ring in the scheme is positioned on the surface of the dielectric filter, and is easy to scratch and scratch when being installed, so that the partition ring is damaged, and the electrical performance of the dielectric filter is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a filter with a negative coupling structure and a manufacturing method thereof, wherein the filter is not easy to damage a partition ring during installation.
In order to achieve the above object, the invention provides a filter with a negative coupling structure, which includes at least two resonators, each resonator includes a resonator body and a tuning hole located on the resonator body, the resonator body is made of a ceramic material, and the tuning hole is a blind hole for tuning the resonant frequency of the resonator where the tuning hole is located; all the dielectric resonator bodies constitute a dielectric filter body, and the filter having the negative coupling structure further includes:
the first negative coupling hole is a blind hole, is formed in the surface of the filter body and is connected with the two adjacent resonators;
the second negative coupling hole is formed in the bottom wall of the first negative coupling hole and penetrates through the filter body;
a conductive layer covering a surface of the filter body, an inner wall surface of the first negative coupling hole, and an inner wall surface of the second negative coupling hole;
the partition ring is arranged on the bottom wall of the first negative coupling hole and surrounds the opening of the second negative coupling hole, the partition ring penetrates through the conducting layer on the bottom wall, the partition ring comprises an inner edge close to the opening and an outer edge far away from the opening, and an insulating material is filled in an area surrounded by the inner edge and the outer edge.
Preferably, the axial line of the partition ring coincides with the axial line of the second negative coupling hole.
Preferably, the axial line of the partition ring coincides with the axial line of the first negative coupling hole.
Preferably, the axis of the first negative coupling hole coincides with the axis of the second negative coupling hole.
Preferably, a virtual plane is formed between the axial lines of the tuning holes of the two adjacent resonators, and the axial line of the isolating ring is located in the plane.
Preferably, a virtual plane is formed between the axes of the tuning holes of the two adjacent resonators, and the axis of the first negative coupling hole is located in the plane.
Preferably, a virtual plane is formed between the axes of the tuning holes of the two adjacent resonators, and the axis of the second negative coupling hole is located in the plane.
Preferably, the shape of the inner edge of the partition ring is the same as the shape of the cross-section of the second negative coupling hole.
Preferably, the shape of the outer rim of the partition ring is the same as the shape of the cross-section of the first negative coupling hole.
In order to achieve the above object, a method in a technical solution provided by the present invention is a method for manufacturing any one of the filters with a negative coupling structure, including the following steps:
s1, forming, namely, dry-pressing and forming the ceramic powder, and forming the debugging hole, the first negative coupling hole and the second negative coupling hole to obtain a ceramic blank;
s2, firing porcelain, sintering the ceramic blank into ceramic, and manufacturing the filter body;
s3, metallization is carried out, silver films are manufactured on the surface of the filter body, the inner wall surface of the first negative coupling hole and the inner wall surface of the second negative coupling hole through a silver immersion or silver spraying process, and the conducting layer is formed;
and S4, processing a blocking ring, processing the blocking ring on the bottom wall of the first negative coupling hole by adopting a laser process or a mechanical electrode process, and firing the conductive layer in the blocking ring at a high temperature to form the insulating material in the process of processing the blocking ring.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the filter with the negative coupling structure, the surface of the filter body is provided with the first negative coupling hole, the bottom wall of the first negative coupling hole is provided with the second negative coupling hole penetrating through the filter body, the inner wall surfaces of the first negative coupling hole and the second negative coupling hole and the surface of the filter body are covered with the conductive layer, the bottom wall of the first negative coupling hole is provided with the isolating ring surrounding the opening part of the second negative coupling hole, the isolating ring penetrates through the conductive layer on the bottom wall of the first negative coupling hole, the isolating ring is filled with the insulating material, the capacitive coupling of the filter with the negative coupling structure can be realized through the matching of the first negative coupling hole, the second negative coupling hole and the isolating ring, and when the filter is installed, the first negative coupling hole can play a role in protecting the isolating ring, so that the isolating ring is not easy to damage; the invention also provides a manufacturing method for manufacturing the filter with the negative coupling structure, which is simple and practical, has high yield and is suitable for mass production.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a partial perspective schematic view of a filter embodiment 1 having a negative coupling structure according to the present invention.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a schematic sectional view in the direction of a-a in fig. 2.
Fig. 4 is a schematic cross-sectional view of embodiment 2 of the filter having a negative coupling structure according to the present invention.
Fig. 5 is a partial top view of embodiment 3 of the filter with a negative coupling structure according to the present invention.
Wherein: 100. a filter; 101. a filter body; 200. a first resonator; 201. a first resonator body; 202. a first pilot hole; 300. a second resonator; 301. a second resonator body; 302. a second pilot hole; 401. a first negative coupling aperture; 402. a second negative coupling aperture; 403. a blocking ring; 4031. an inner edge; 4032. an outer edge; 500. a conductive layer; 600. an insulating material.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 to 3, the present invention provides a filter 100 with a negative coupling structure, including two resonators with the same structure, namely a first resonator 200 and a second resonator 300, wherein the first resonator 200 includes a first resonator body 201 and a first tuning hole 202 located on an upper surface of the first resonator body 201, the first resonator body 201 is made of a ceramic material, the first tuning hole 202 is a blind hole, and the first tuning hole 202 is used for tuning a resonant frequency of the first resonator 200; the second resonator 300 comprises a second resonator body 301 and a second debugging hole 302 positioned on the upper surface of the second resonator body 301, the second resonator body 301 is made of ceramic materials, the second debugging hole 302 is a blind hole, the second debugging hole 302 is used for debugging the resonance frequency of the second resonator 300, and the axial line of the second debugging hole 302 is parallel to the axial line of the first debugging hole 202; the first resonator body 201 and the second resonator body 301 form a filter body 101, the filter 100 with the negative coupling structure further includes a first negative coupling hole 401, a second negative coupling hole 402, a conductive layer 500, and a blocking ring 403, wherein the first negative coupling hole 401 is located on the upper surface of the filter body 101 and located at a connection position of the first resonator 200 and the second resonator 300, the first negative coupling hole 401 is located at a position connected with the first resonator 200 and the second resonator 300, the first negative coupling hole 401 is a blind hole, an opening of the first negative coupling hole 401 located on the upper surface of the filter body 101 is circular, and a chamfer is arranged at a port portion of the first negative coupling hole 401 located on the upper surface of the filter body 101; the second negative coupling hole 402 is formed in the bottom wall of the first negative coupling hole 401 and extends downwards until penetrating through the filter body 101, and the axis of the second negative coupling hole 402 coincides with the axis of the first negative coupling hole 401 and is located in a virtual plane formed by the axis of the first debugging hole 202 and the axis of the second debugging hole 302; the conductive layer 500 covers the surface of the filter body 101, the inner wall surface of the first negative coupling hole 401, and the inner wall surface of the second negative coupling hole 402, and the conductive layer 500 is made of silver.
The bottom wall of the first negative coupling hole 401 is provided with a partition ring 403 surrounding the aperture portion of the second negative coupling hole 402, the partition ring 403 comprises an inner edge 4031 close to the aperture portion of the second negative coupling hole 402 and an outer edge 4032 far from the aperture portion of the second negative coupling hole 402, the conductive layer 500 in the area between the inner rim 4031 and the outer rim 4032 is sintered at a high temperature to form an insulating material 600 having insulating properties, the thickness of the insulating material 600 is less than or equal to the thickness of the conductive layer 500, the first negative coupling hole 401, the second negative coupling hole 403 and the spacer ring 403 cooperate to form a capacitive coupling between the first resonator 200 and the second resonator 300, it being conceivable that the spacer ring 403 is not covered by the conductive layer 500, the technical effects of the present invention can also be achieved by filling other insulating materials between the inner rim 4031 and the outer rim 4032, or by not filling the insulating materials, but only exposing the dielectric filter body 101.
The axial line of the first negative coupling hole 401 coincides with the axial line of the second negative coupling hole 402, and the axial line of the partition ring 403 coincides with the axial line of the first negative coupling hole 401.
The axis of the first pilot hole 202 and the axis of the second pilot hole 302 form a virtual plane in which the axis of the partition ring 403 is located.
The cross-section of the second negative coupling hole 402 is circular, and the shape enclosed by the outer edge 4032 and the inner edge 4031 of the partition ring 403 is also circular.
The distance between the outer rim 4032 and the inner rim 4031 is the width of the blocker ring 403, which is less than half the difference in radii of the first and second negative coupling holes 401 and 402.
Example 2
As shown in fig. 4, embodiment 2 is substantially the same as embodiment 1, except that a first negative coupling hole 401 is opened in the lower surface of the filter body 101 in embodiment 2, and a second negative coupling hole 402 is opened in the bottom wall of the first negative coupling hole 401 and extends upward to penetrate through the filter body 101.
Example 3
As shown in fig. 5, the embodiment 3 is substantially the same as the embodiment 1, except that the cross section of the first negative coupling hole 401 in the embodiment 3 is rectangular, and the shape enclosed by the inner edge 4031 and the outer edge 4032 of the partition ring 403 is also rectangular.
According to the filter with the negative coupling structure, the surface of the filter body is provided with the first negative coupling hole, the bottom wall of the first negative coupling hole is provided with the second negative coupling hole penetrating through the filter body, the inner wall surfaces of the first negative coupling hole and the second negative coupling hole and the surface of the filter body are covered with the conductive layer, the bottom wall of the first negative coupling hole is provided with the isolating ring surrounding the opening part of the second negative coupling hole, the isolating ring penetrates through the conductive layer on the bottom wall of the first negative coupling hole, the isolating ring is filled with the insulating material, the capacitive coupling of the filter with the negative coupling structure can be realized through the matching of the first negative coupling hole, the second negative coupling hole and the isolating ring, and when the filter is installed, the first negative coupling hole can play a role in protecting the isolating ring, so that the isolating ring is not easy to damage.
The invention also provides a manufacturing method for manufacturing the filter with the negative coupling structure, which comprises the following steps:
s1, forming, namely, dry-pressing and forming the ceramic powder, and forming the debugging hole, the first negative coupling hole and the second negative coupling hole to obtain a ceramic blank;
s2, firing porcelain, sintering the ceramic blank into ceramic, and manufacturing the filter body;
s3, metallization is carried out, silver films are manufactured on the surface of the filter body, the inner wall surface of the first negative coupling hole and the inner wall surface of the second negative coupling hole through a silver immersion or silver spraying process, and the conducting layer is formed;
and S4, processing a blocking ring, processing the blocking ring on the bottom wall of the first negative coupling hole by adopting a laser process or a mechanical electrode process, and firing the conductive layer in the blocking ring at a high temperature to form the insulating material in the process of processing the blocking ring.
The manufacturing method is simple and practical, high in yield and suitable for mass production.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A filter with a negative coupling structure comprises at least two resonators, wherein each resonator comprises a resonator body and a debugging hole positioned on the resonator body, the resonator body is made of ceramic materials, and the debugging hole is a blind hole and used for debugging the resonance frequency of the resonator in which the debugging hole is positioned; all the dielectric resonator bodies constitute a dielectric filter body, and the filter having the negative coupling structure further includes:
the first negative coupling hole is a blind hole, is formed in the surface of the filter body and is connected with the two adjacent resonators;
the second negative coupling hole is formed in the bottom wall of the first negative coupling hole and penetrates through the filter body;
a conductive layer covering a surface of the filter body, an inner wall surface of the first negative coupling hole, and an inner wall surface of the second negative coupling hole;
the method is characterized in that:
the partition ring is arranged on the bottom wall of the first negative coupling hole and surrounds the opening of the second negative coupling hole, the partition ring penetrates through the conducting layer on the bottom wall, the partition ring comprises an inner edge close to the opening and an outer edge far away from the opening, and an insulating material is filled in an area surrounded by the inner edge and the outer edge.
2. The filter having a negative coupling structure according to claim 1, wherein an axis of the blocker ring coincides with an axis of the second negative coupling hole.
3. The filter having a negative coupling structure according to claim 1, wherein an axis of the blocker ring coincides with an axis of the first negative coupling hole.
4. The filter having a negative coupling structure according to claim 1, wherein the axis of the first negative coupling hole coincides with the axis of the second negative coupling hole.
5. The filter with the negative coupling structure as claimed in claim 1, wherein the axes of the tuning holes of two adjacent resonators form a virtual plane, and the axes of the ring spacers are located in the plane.
6. The filter of claim 1, wherein the axes of the debugging holes on two adjacent resonators form a virtual plane, and the axis of the first negative coupling hole is located in the plane.
7. The filter of claim 1, wherein the axes of the debugging holes on two adjacent resonators form a virtual plane, and the axis of the second negative coupling hole is located in the plane.
8. The filter having a negative coupling structure according to claim 1, wherein the shape of the inner edge of the partition ring is the same as the shape of the cross-section of the second negative coupling hole.
9. The filter with a negative coupling structure according to claim 1, wherein the shape of the outer rim of the blocker ring is the same as the shape of the cross-section of the first negative coupling hole.
10. A method of manufacturing a filter having a negative coupling structure according to any one of claims 1 to 9, comprising the steps of:
s1, forming, namely, dry-pressing and forming the ceramic powder, and forming the debugging hole, the first negative coupling hole and the second negative coupling hole to obtain a ceramic blank;
s2, firing porcelain, sintering the ceramic blank into ceramic, and manufacturing the filter body;
s3, metallization is carried out, silver films are manufactured on the surface of the filter body, the inner wall surface of the first negative coupling hole and the inner wall surface of the second negative coupling hole through a silver immersion or silver spraying process, and the conducting layer is formed;
and S4, processing a blocking ring, processing the blocking ring on the bottom wall of the first negative coupling hole by adopting a laser process or a mechanical electrode process, and firing the conductive layer in the blocking ring at a high temperature to form the insulating material in the process of processing the blocking ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/113412 WO2021169232A1 (en) | 2020-02-26 | 2020-09-04 | Filter and manufacturing method therefor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010118709 | 2020-02-26 | ||
| CN2020101187097 | 2020-02-26 |
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| CN111540989A true CN111540989A (en) | 2020-08-14 |
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| CN202010460104.6A Pending CN111540989A (en) | 2020-02-26 | 2020-05-27 | Filter with negative coupling structure and manufacturing method thereof |
| CN202020925694.0U Active CN212033197U (en) | 2020-02-26 | 2020-05-27 | Filter with negative coupling structure |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020925694.0U Active CN212033197U (en) | 2020-02-26 | 2020-05-27 | Filter with negative coupling structure |
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| WO (1) | WO2021169232A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072239A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric filter and manufacturing method thereof |
| CN112072240A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
| WO2021169232A1 (en) * | 2020-02-26 | 2021-09-02 | 江苏灿勤科技股份有限公司 | Filter and manufacturing method therefor |
| KR20230088199A (en) * | 2021-12-10 | 2023-06-19 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Duplexer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5926079A (en) * | 1996-12-05 | 1999-07-20 | Motorola Inc. | Ceramic waveguide filter with extracted pole |
| EP2993727B1 (en) * | 2013-06-04 | 2019-03-20 | Huawei Technologies Co., Ltd. | Dielectric resonator and dielectric filter, transceiver and base station using same |
| CN109687072B (en) * | 2019-01-11 | 2020-04-21 | 苏州艾福电子通讯股份有限公司 | Filter with a filter element having a plurality of filter elements |
| CN110783670A (en) * | 2019-10-25 | 2020-02-11 | 京信通信技术(广州)有限公司 | Communication device, dielectric waveguide filter and capacitive coupling bandwidth adjusting method thereof |
| CN111540989A (en) * | 2020-02-26 | 2020-08-14 | 江苏灿勤科技股份有限公司 | Filter with negative coupling structure and manufacturing method thereof |
-
2020
- 2020-05-27 CN CN202010460104.6A patent/CN111540989A/en active Pending
- 2020-05-27 CN CN202020925694.0U patent/CN212033197U/en active Active
- 2020-09-04 WO PCT/CN2020/113412 patent/WO2021169232A1/en active Application Filing
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021169232A1 (en) * | 2020-02-26 | 2021-09-02 | 江苏灿勤科技股份有限公司 | Filter and manufacturing method therefor |
| CN112072239A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric filter and manufacturing method thereof |
| CN112072240A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
| CN112072240B (en) * | 2020-08-28 | 2021-11-16 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
| KR20230088199A (en) * | 2021-12-10 | 2023-06-19 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Duplexer |
| KR102664089B1 (en) * | 2021-12-10 | 2024-05-09 | 주식회사 에이스테크놀로지 | Ceramic Waveguide Duplexer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN212033197U (en) | 2020-11-27 |
| WO2021169232A1 (en) | 2021-09-02 |
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