CN109994807B - Dielectric double short filter - Google Patents
Dielectric double short filter Download PDFInfo
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- CN109994807B CN109994807B CN201910356162.1A CN201910356162A CN109994807B CN 109994807 B CN109994807 B CN 109994807B CN 201910356162 A CN201910356162 A CN 201910356162A CN 109994807 B CN109994807 B CN 109994807B
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- dielectric
- cavity
- ring body
- resonance column
- cover plate
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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
- H01P1/207—Hollow waveguide filters
Abstract
The invention relates to a dielectric double short filter, which comprises a cavity with an open end, a cover plate mounted to the open end of the cavity, and a tuning assembly mounted to the cover plate and the cavity, wherein the tuning assembly comprises a supporting seat, a dielectric resonance column and an elastic piece which are sequentially connected, the cover plate is provided with a mounting hole, the supporting seat comprises a first mounting part, the first mounting part is mounted to the mounting hole of the cover plate, the bottom of the cavity is provided with a containing cavity, and the elastic piece comprises a second mounting part, and the second mounting part stretches into the containing cavity and is propped against the inner wall of the containing cavity along the radial direction of the containing cavity. The invention can improve the contact reliability of the filter.
Description
[ field of technology ]
The present invention relates to a dielectric filter, and more particularly, to a TM (transverse magnetic) mode dielectric dual short filter.
[ background Art ]
The TM mode dielectric dual short filter is used as a receiving and transmitting filter of a mobile base station radio frequency front end key device, and the quality of the performance of the TM mode dielectric dual short filter directly influences the quality of communication. With the development of mobile communication networks, the approach of 5G technology is that dielectric filters have the characteristic of miniaturization and high Q value, and are widely used in 5G technology.
In the existing medium double short filter, on one hand, a medium resonance column is usually pressed and connected to the bottom of a cavity by adopting a silver-plated copper sheet and a rubber elastic gasket in a combined way, and under a high-low temperature environment, the rubber elastic gasket can generate an expansion and contraction effect so as to influence the short circuit contact between the medium resonance column and the cavity, thereby influencing the index of the filter under the high-temperature or low-temperature environment; on the other hand, the filter adopts a structure with two thick and thin cover plates, and because the thin cover plates are small in thickness, and are processed by aluminum materials, the plane is poor in flatness and easy to deform, the cover plates are in poor contact with the dielectric resonator, and the Q value and intermodulation of the filter are affected.
[ invention ]
The invention aims to overcome the defects of the technology and provide a dielectric double short filter, which improves the contact reliability of the filter.
The invention provides a dielectric double short filter, which comprises a cavity with an open end, a cover plate mounted at the open end of the cavity, and a tuning assembly mounted to the cover plate and the cavity, wherein the tuning assembly comprises a supporting seat, a dielectric resonance column and an elastic piece which are sequentially connected, the cover plate is provided with a mounting hole, the supporting seat comprises a first mounting part, the first mounting part is mounted to the mounting hole of the cover plate, the bottom of the cavity is provided with a containing cavity, and the elastic piece comprises a second mounting part which extends into the containing cavity and is propped against the inner wall of the containing cavity along the radial direction of the containing cavity.
Further, the second mounting portion includes a first ring body and a second ring body formed at an end of the first ring body away from the dielectric resonator post, and an outer periphery of the second ring body protrudes from an outer periphery of the first ring body.
Further, a plurality of grooves are formed in the second ring body, the second ring body is divided into a plurality of first contact pieces by the plurality of grooves, and the plurality of first contact pieces are annularly arranged and propped against the inner wall of the accommodating cavity along the radial direction of the accommodating cavity.
Further, the grooves extend to the first ring body and divide the first ring body into a plurality of second contact pieces, and the plurality of second contact pieces are annularly arranged.
Further, the support base includes a support base body connected to the dielectric resonator post, and the first mounting portion is formed at an end of the support base body away from the dielectric resonator post; the support seat body is close to one end of the dielectric resonance column is formed with a first matching portion, and the first matching portion is embedded into the resonant cavity of the dielectric resonance column.
Further, the elastic member includes an elastic member body connected to the dielectric resonator post, and the second mounting portion is formed at an end of the elastic member body remote from the dielectric resonator post; and a second matching part is formed at one end of the elastic piece body, which is close to the dielectric resonance column, and the second matching part is embedded into the resonant cavity of the dielectric resonance column.
Further, the supporting seat, the dielectric resonance column and the elastic piece are mutually welded.
Further, a concave position is arranged on one surface, far away from the cavity, of the cover plate at a position corresponding to the mounting hole, one end, far away from the dielectric resonance column, of the first mounting portion protrudes out of the mounting hole and is located in the concave position, and a first nut is connected with the first nut in a threaded mode.
Further, the first mounting portion, the supporting seat body and the first matching portion are provided with through holes communicated with the resonant cavities of the dielectric resonant columns, tuning screws are arranged in the through holes, one ends of the tuning screws extend into the resonant cavities, the other ends of the tuning screws extend out of the through holes and are located outside the first mounting portion, and second nuts are mounted on the tuning screws.
According to the invention, the dielectric resonance column is connected to the cover plate and the cavity through the supporting seat and the elastic piece, so that the contact is reliable, various indexes of the filter are ensured, the high Q value, the low loss and the like can be realized, and the double-short function can be realized.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of a dielectric dual short filter according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the dielectric dual short filter of FIG. 1;
FIG. 3 is an exploded view of the cavity and tuning assembly, cover plate of the dielectric dual short filter of FIG. 2;
FIG. 4 is an exploded schematic view of the dielectric dual short filter of FIG. 1;
fig. 5 is a schematic diagram of the tuning assembly of the dielectric dual short filter of fig. 1.
[ detailed description ] of the invention
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1 and 2, the present invention provides a dielectric dual short filter including a cavity 10 having an open end, a cover plate 20 mounted to the open end of the cavity 10 by screws, and a tuning assembly mounted to the cover plate 20 and the cavity 10. Connectors 90 are connected to both sides of the cavity 10, respectively, and the connectors 90 are used for connecting with other electronic devices.
Referring to fig. 2 to 5, the tuning assembly includes a support base 30, a dielectric resonator post 40, and an elastic member 50, which are sequentially connected. Preferably, the supporting seat 30, the dielectric resonator post 40 and the elastic member 50 are welded to each other, simplifying the assembly process. The support base 30 is a metal support base. The dielectric resonator column 40 is a tubular ceramic dielectric resonator column.
The support base 30 includes a support base body 31 connected to one end of the dielectric resonator post 40, a first mounting portion 32 formed at one end of the support base body 31 remote from the dielectric resonator post 40, and a first fitting portion 33 formed at one end of the support base body 31 near the dielectric resonator post 40.
The cover plate 20 has a mounting hole 21, and the first mounting portion 32 is mounted to the mounting hole 21. As shown in fig. 1, a surface of the cover plate 20, which is far away from the cavity 10, is provided with a recess 22 at a position corresponding to the mounting hole 21, and one end of the first mounting portion 32, which is far away from the dielectric resonator post 40, protrudes from the mounting hole 21 and is located in the recess 22, and is in threaded connection with a first nut 60, so that the support base 30 can be fixed to the cover plate 20 through the first nut 60. The support base 30 can be used for connecting the dielectric resonance column 40 to the cover plate 20, so that the grounding effect of the end, connected with the support base 30, of the dielectric resonance column 40 is ensured, and even if the cover plate 20 is deformed, good contact between the dielectric resonance column 40 and the cover plate 20 can be ensured, and the Q value and the interaction of the filter can not be influenced.
The dielectric resonator column 40 has an axial resonator 41. The first fitting portion 33 is fitted into the resonant cavity 41, ensuring tightness of connection between the support base 30 and the dielectric resonator post 40.
The first mounting portion 32, the support base body 31, and the first fitting portion 33 have an axial through hole 34 communicating with the resonant cavity 41 of the dielectric resonator post 40. A tuning screw 70 is provided in the through hole 34, one end of the tuning screw 70 extends into the resonant cavity 41, and the other end extends out of the through hole 34 and is located outside the first mounting portion 32, and a second nut 80 is mounted. Tuning screw 70 is fixedly mounted to through hole 34 by a second nut 80, and tuning frequency adjustment of the filter can be achieved by adjusting the depth of penetration of tuning screw 70 into resonant cavity 41.
The elastic member 50 includes an elastic member body 51 connected to the other end of the dielectric resonator post 40, a second mounting portion 52 formed at one end of the elastic member body 51 remote from the dielectric resonator post 40, and a second fitting portion 53 formed at one end of the elastic member body 51 near the dielectric resonator post 40.
The bottom of the cavity 10 is provided with the accommodating cavity 11, the second mounting part 52 extends into the accommodating cavity 11 and abuts against the inner wall of the accommodating cavity 11 along the radial direction of the accommodating cavity 11, so that the dielectric resonance column 40 can be connected to the cavity 10 through the elastic piece 50, the grounding effect of the end, connected with the elastic piece 50, of the dielectric resonance column 40 is ensured, the reliability of contact between the dielectric resonance column 40 and the cavity 10 can be ensured through the elastic piece 50, the index of the filter in a high-temperature or low-temperature environment is ensured, and the high Q value, the low loss and the like are realized.
The invention realizes the connection of the dielectric resonance column 40 to the cover plate 20 and the cavity 10 through the supporting seat 30 and the elastic piece 50, has reliable contact, ensures various indexes of the filter, can realize high Q value, low loss and the like, and can realize double short functions.
Specifically, the second mounting portion 52 includes a first ring member 521 formed at an end of the elastic member body 51 remote from the dielectric resonator post 40, and a second ring member 522 formed at an end of the first ring member 521 remote from the dielectric resonator post 40, an outer periphery of the second ring member 522 protruding from an outer periphery of the first ring member 521. The first ring 521 and the second ring 522 are closed rings. It will be appreciated that the first and second rings 521, 522 may be non-closed rings. Preferably, the first ring 521 and the second ring 522 are transitioned by a chamfer.
The second ring body 522 is provided with a plurality of grooves 523, the grooves 523 divide the second ring body 522 into a plurality of first contact pieces 524, and the plurality of first contact pieces 524 are annularly arranged and are propped against the inner wall of the accommodating cavity 11 along the radial direction of the accommodating cavity 11. The arrangement of the plurality of first contact pieces 524 can further ensure the connection between the dielectric resonance column 40 and the cavity 10, ensure the grounding effect of the end, connected with the cavity 10, of the dielectric resonance column 40, and even if a small number of the first contact pieces 524 are damaged, the whole contact cannot be influenced, so that the high intermodulation requirement is ensured.
The grooves 523 extend to the first ring 521 and divide the first ring 521 into a plurality of second contact pieces 525, and the plurality of second contact pieces 525 are annularly arranged. The arrangement of the second contact pieces 525 can increase the elasticity of the first contact pieces 524, so that the assembly is convenient. The number of the first contact pieces 524 and the second contact pieces 525 may be set according to actual situations.
A chamfer 111 is provided at the opening of the housing chamber 11 to accommodate the second mounting portion 52 for ease of assembly.
The second fitting portion 53 is fitted into the resonant cavity 41 of the dielectric resonator post 40, ensuring tightness of connection between the elastic member 50 and the dielectric resonator post 40.
The foregoing examples only illustrate preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that modifications and improvements can be made without departing from the spirit of the invention, such as combining different features of the various embodiments, which are all within the scope of the invention.
Claims (6)
1. A dielectric dual short filter comprising a cavity having an open end, a cover plate mounted to the open end of the cavity, a tuning assembly mounted to the cover plate and the cavity, characterized in that: the tuning assembly comprises a supporting seat, a dielectric resonance column and an elastic piece which are sequentially connected, wherein the supporting seat, the dielectric resonance column and the elastic piece are welded with each other; the cover plate is provided with a mounting hole, the supporting seat comprises a first mounting part, the first mounting part is mounted to the mounting hole of the cover plate, the bottom of the cavity is provided with a containing cavity, the elastic piece comprises a second mounting part, and the second mounting part stretches into the containing cavity and is propped against the inner wall of the containing cavity along the radial direction of the containing cavity; the second installation part comprises a first ring body and a second ring body, the second ring body is formed at one end of the first ring body, which is far away from the dielectric resonance column, and the outer periphery of the second ring body protrudes out of the outer periphery of the first ring body; the second ring body is provided with a plurality of grooves, the second ring body is divided into a plurality of first contact pieces by the plurality of grooves, and the plurality of first contact pieces are annularly arranged and propped against the inner wall of the accommodating cavity along the radial direction of the accommodating cavity.
2. The dielectric dual short filter of claim 1, wherein: the grooves extend to the first ring body and divide the first ring body into a plurality of second contact pieces which are annularly arranged.
3. The dielectric dual short filter of claim 1, wherein: the support base comprises a support base body connected to the dielectric resonance column, and the first mounting part is formed at one end of the support base body far away from the dielectric resonance column; the support seat body is close to one end of the dielectric resonance column is formed with a first matching portion, and the first matching portion is embedded into the resonant cavity of the dielectric resonance column.
4. The dielectric dual short filter of claim 1, wherein: the elastic member includes an elastic member body connected to the dielectric resonator post, and the second mounting portion is formed at an end of the elastic member body remote from the dielectric resonator post; and a second matching part is formed at one end of the elastic piece body, which is close to the dielectric resonance column, and the second matching part is embedded into the resonant cavity of the dielectric resonance column.
5. The dielectric dual short filter of claim 1, wherein: one surface of the cover plate, which is far away from the cavity, is provided with a concave position at the position corresponding to the mounting hole, one end of the first mounting part, which is far away from the dielectric resonance column, protrudes out of the mounting hole and is positioned in the concave position, and is in threaded connection with a first nut.
6. The dielectric dual short filter of claim 5 wherein: the first mounting part, the supporting seat body and the first matching part are provided with through holes communicated with the resonant cavities of the dielectric resonant columns, tuning screws are arranged in the through holes, one ends of the tuning screws extend into the resonant cavities, the other ends of the tuning screws extend out of the through holes and are located outside the first mounting part, and second nuts are mounted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356162.1A CN109994807B (en) | 2019-04-29 | 2019-04-29 | Dielectric double short filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356162.1A CN109994807B (en) | 2019-04-29 | 2019-04-29 | Dielectric double short filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109994807A CN109994807A (en) | 2019-07-09 |
| CN109994807B true CN109994807B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910356162.1A Active CN109994807B (en) | 2019-04-29 | 2019-04-29 | Dielectric double short filter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6600394B1 (en) * | 1999-09-24 | 2003-07-29 | Radio Frequency Systems, Inc. | Turnable, temperature stable dielectric loaded cavity resonator and filter |
| CN102623785A (en) * | 2011-01-28 | 2012-08-01 | 深圳市大富科技股份有限公司 | Dielectric filter, dielectric resonator, cover plate unit and communication equipment |
| CN103151581A (en) * | 2012-11-30 | 2013-06-12 | 摩比天线技术（深圳）有限公司 | Transverse magnetic (TM) mold dielectric filter |
| CN205406685U (en) * | 2016-01-13 | 2016-07-27 | 广东通宇通讯股份有限公司 | Transverse magnetic (TM) mold dielectric filter |
| CN106129559A (en) * | 2016-07-08 | 2016-11-16 | 广东通宇通讯股份有限公司 | A kind of TM mould both-end short circuit wave filter |
| CN205882134U (en) * | 2016-07-18 | 2017-01-11 | 中兴通讯股份有限公司 | Dielectric filter |
| WO2018132985A1 (en) * | 2017-01-18 | 2018-07-26 | 华为技术有限公司 | Transverse magnetic mode dielectric resonator, filter, and communication device |
-
2019
- 2019-04-29 CN CN201910356162.1A patent/CN109994807B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6600394B1 (en) * | 1999-09-24 | 2003-07-29 | Radio Frequency Systems, Inc. | Turnable, temperature stable dielectric loaded cavity resonator and filter |
| CN102623785A (en) * | 2011-01-28 | 2012-08-01 | 深圳市大富科技股份有限公司 | Dielectric filter, dielectric resonator, cover plate unit and communication equipment |
| CN103151581A (en) * | 2012-11-30 | 2013-06-12 | 摩比天线技术（深圳）有限公司 | Transverse magnetic (TM) mold dielectric filter |
| CN205406685U (en) * | 2016-01-13 | 2016-07-27 | 广东通宇通讯股份有限公司 | Transverse magnetic (TM) mold dielectric filter |
| CN106129559A (en) * | 2016-07-08 | 2016-11-16 | 广东通宇通讯股份有限公司 | A kind of TM mould both-end short circuit wave filter |
| CN205882134U (en) * | 2016-07-18 | 2017-01-11 | 中兴通讯股份有限公司 | Dielectric filter |
| WO2018132985A1 (en) * | 2017-01-18 | 2018-07-26 | 华为技术有限公司 | Transverse magnetic mode dielectric resonator, filter, and communication device |
Non-Patent Citations (1)
| Title |
|---|
| 介质谐振腔滤波器的设计;柳光福, 刘启明, 葛光楣;航空电子技术(第01期);全文 * |
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| CN109994807A (en) | 2019-07-09 |
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Address after: 518000 5th floor, building 1, Guoren science and Technology Park, the intersection of Jinxiu middle road and Cuijing Road, Longtian street, Pingshan District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Guoren Technology Co.,Ltd. Address before: 518000 7F, B 7F, China Science and technology three road, central high tech Zone, Shenzhen, Guangdong Applicant before: SHENZHEN GRENTECH RF COMMUNICATION Ltd. |
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