CN110137638B - Ceramic waveguide filter - Google Patents
Ceramic waveguide filter Download PDFInfo
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- CN110137638B CN110137638B CN201910343603.4A CN201910343603A CN110137638B CN 110137638 B CN110137638 B CN 110137638B CN 201910343603 A CN201910343603 A CN 201910343603A CN 110137638 B CN110137638 B CN 110137638B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 123
- 230000008878 coupling Effects 0.000 claims abstract description 82
- 238000010168 coupling process Methods 0.000 claims abstract description 82
- 238000005859 coupling reaction Methods 0.000 claims abstract description 82
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000007747 plating Methods 0.000 claims description 8
- 229910010293 ceramic material Inorganic materials 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 6
- 238000009713 electroplating Methods 0.000 abstract description 5
- 230000004044 response Effects 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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Classifications
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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
Abstract
The invention provides a ceramic waveguide filter, which comprises a plurality of ceramic waveguide resonators, wherein every two adjacent ceramic waveguide resonators are communicated and mutually coupled through a coupling connecting bridge; and an inclined through hole penetrating through the upper surface and the lower surface of the ceramic waveguide filter is arranged at the coupling connection bridge between at least two adjacent ceramic waveguide resonators, so that capacitive coupling is generated between the two adjacent ceramic waveguide resonators. Preferably, the present invention can adjust the magnitude of the capacitive coupling amount by adjusting the width of the coupling bridge, the aperture of the inclined through-hole and/or the inclination angle of the inclined through-hole. Therefore, compared with the existing method for realizing capacitive coupling of the deep blind hole or the snake-shaped window and the like, the ceramic waveguide filter has the advantages of simple structure, no need of assembly welding, and easiness in processing and electroplating.
Description
Technical Field
The invention relates to the technical field of filters in the field of wireless communication, in particular to a ceramic waveguide filter.
Background
The ceramic waveguide filter is a frequency selective device which is formed by cascading a plurality of ceramic waveguide resonators by using a specific ceramic material as a carrier. With the rapid development of wireless communication technology, the market has increasingly strict requirements on the performance and volume of communication base station equipment. The ceramic waveguide filter has wide application prospect in the future due to the compact volume and relatively high Q value performance. Like other forms of filters, ceramic waveguide filters have difficulties such as complex structure and limited mode in realizing capacitive coupling compared with inductive coupling. The current commonly used implementation schemes mainly include:
(1) multi-ceramic module scheme: a plurality of ceramic resonant blocks are welded in a combined mode, and a specially-shaped coupling window is etched on the combined face to achieve capacitive coupling. The disadvantages are the need for assembly and welding, the cumbersome procedure and the introduction of additional assembly tolerances, which affect product consistency.
(2) Single ceramic module scheme: a deep blind hole is arranged on a coupling part of the ceramic resonant block to reverse the coupling polarity to generate capacitive coupling. The disadvantage is that the processing and electroplating of deep blind holes are difficult.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a ceramic waveguide filter having advantages of simple structure, no need of assembly welding, and easy processing and plating.
In order to achieve the above object, the present invention provides a ceramic waveguide filter, including a plurality of ceramic waveguide resonators, each two adjacent ceramic waveguide resonators being connected and coupled to each other by a coupling bridge; and an inclined through hole penetrating through the upper surface and the lower surface of the ceramic waveguide filter is arranged at the coupling connection bridge between at least two adjacent ceramic waveguide resonators, so that capacitive coupling is generated between the two adjacent ceramic waveguide resonators.
According to the ceramic waveguide filter, the inclined through hole is formed in the coupling connection bridge between two adjacent ceramic waveguide resonators in the middle of the ceramic waveguide filter.
According to the ceramic waveguide filter of the present invention, the tilt axes of the tilt vias are located at or parallel to the central connection line of two adjacent ceramic waveguide resonators.
According to the ceramic waveguide filter, the cross section of the inclined through hole is circular, square, oval or irregular.
According to the ceramic waveguide filter of the present invention, the surface of the ceramic waveguide resonator and/or the inner surface of the inclined through-hole is provided with a conductive plating layer.
According to the ceramic waveguide filter, a sinking blind hole is formed in the center of the upper surface of each ceramic waveguide resonator.
According to the ceramic waveguide filter, the ceramic waveguide resonator is a ceramic cuboid module, and the coupling connection bridge is made of a ceramic material.
According to the ceramic waveguide filter, the ceramic waveguide filter is formed by processing a whole ceramic material, and the middle of the ceramic waveguide filter is provided with two cross-shaped dividing grooves for locally dividing a plurality of ceramic waveguide resonators.
According to the ceramic waveguide filter, the width of the coupling connection bridge, the aperture of the inclined through hole and/or the inclination angle of the inclined through hole are/is adjusted to adjust the capacitive coupling amount.
If the width of the coupling connection bridge is increased, the capacitive coupling amount is reduced;
if the aperture of the inclined through hole is increased within a preset interval range, the capacitive coupling amount is increased;
and if the inclination angle of the inclined through hole is increased, the capacitive coupling amount is increased.
The ceramic waveguide filter comprises a plurality of ceramic waveguide resonators, and every two adjacent ceramic waveguide resonators are communicated with each other through the coupling connecting bridge, so that the frequency selection characteristic of the ceramic filter is realized. An inclined through hole penetrating through the upper surface and the lower surface of the ceramic waveguide filter is arranged at a coupling connection bridge between two adjacent ceramic waveguide resonators to generate required capacitive coupling, so that the frequency response characteristic of the ceramic filter is realized. Preferably, the present invention can adjust the magnitude of the capacitive coupling amount by adjusting the width of the coupling bridge, the aperture of the inclined through-hole and/or the inclination angle of the inclined through-hole. Therefore, compared with the existing method for realizing capacitive coupling of the deep blind hole or the snake-shaped window and the like, the ceramic waveguide filter has the advantages of simple structure, no need of assembly welding, and easiness in processing and electroplating.
Drawings
Fig. 1 is a top view of a preferred ceramic waveguide filter of the present invention.
FIG. 2 is a schematic cross-sectional view in the direction A-A' of the preferred ceramic waveguide filter of FIG. 1;
FIG. 3 is a graph of the frequency response of a preferred ceramic waveguide filter of the present invention;
FIG. 4 is a graph showing the relationship between the width of the coupling bridge and the amount of capacitive coupling in the ceramic waveguide filter according to the present invention;
FIG. 5 is a graph showing the relationship between the aperture of the inclined through-hole and the amount of capacitive coupling in the ceramic waveguide filter according to the present invention;
FIG. 6 is a graph showing the relationship between the inclination angle of the inclined through-hole and the amount of capacitive coupling in the ceramic waveguide filter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that references in the specification to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not intended to refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
Moreover, where certain terms are used throughout the description and following claims to refer to particular components or features, those skilled in the art will understand that manufacturers may refer to a component or feature by different names or terms. This specification and the claims that follow do not intend to distinguish between components or features that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. In addition, the term "connected" as used herein includes any direct and indirect electrical connection. Indirect electrical connection means include connection by other means.
Fig. 1 and 2 show the structure of a ceramic waveguide filter according to the present invention, and the ceramic waveguide filter 10 includes a plurality of ceramic waveguide resonators 11, and every two adjacent ceramic waveguide resonators 11 are connected and coupled to each other by a coupling bridge 13. The ceramic waveguide resonator 11 is preferably a ceramic cuboid module, which is formed by sintering and grinding, and the coupling bridge 13 is preferably also made of a ceramic material. The ceramic waveguide resonators 11 are connected in pairs and exposed to each other through the coupling connection bridges 13 to form mutual energy coupling between the ceramic waveguide resonators 11, thereby realizing the frequency selective characteristic of the ceramic waveguide filter 10. An inclined through hole 15 penetrating the upper and lower surfaces of the ceramic waveguide filter 10 is formed at the coupling bridge 13 between at least two adjacent ceramic waveguide resonators 11, so that capacitive coupling is generated between the two adjacent ceramic waveguide resonators 11, thereby realizing the frequency response characteristic of the ceramic waveguide filter 10, as shown in fig. 3.
Preferably, a slanted via hole 15 is formed at the coupling bridge 13 between two adjacent ceramic waveguide resonators 11 at the middle of the ceramic waveguide filter 10, as shown in fig. 1 and 2. I.e. the entire ceramic waveguide filter 10 is provided with only one inclined through hole 15. Of course, the ceramic waveguide filter 10 may be provided with a plurality of inclined through holes 15. That is, all or a part of the coupling bridges 13 between two adjacent ceramic waveguide resonators 11 are provided with an inclined through hole 15, respectively.
In this embodiment, the ceramic waveguide filter 10 includes six ceramic waveguide resonators 11, which are ceramic dielectric rectangular blocks and are distributed in an array. A sunken blind hole 12 is formed in the center of the upper surface of each ceramic waveguide resonator 11 and used for adjusting the resonant frequency of each ceramic waveguide resonator in design. The ceramic waveguide resonators 11 and the coupling bridges 13 constitute the entire ceramic filter 10. The ceramic waveguide filter 10 is formed by processing a monolithic ceramic material, and the middle part of the ceramic waveguide filter is partially divided by two penetrating cross-shaped dividing grooves 14, so that the ceramic waveguide filter does not need to be assembled and welded, and is easy to process and electroplate.
Preferably, the entire surface of the ceramic waveguide resonator 11 is covered with a conductive coating, and a high-conductivity metal layer such as silver plating or copper plating is generally used to improve the performance.
The ceramic waveguide filter 10 of the present invention can be mixed and cascaded with more ceramic waveguide resonators 11 to form a filter of any order. The ceramic waveguide filter 10 realizes the capacitive coupling of the filter by arranging the inclined through hole 15 at the coupling connecting bridge 13 between the two ceramic waveguide resonators 11, and compared with the existing method for realizing the capacitive coupling by a deep blind hole or an etching coupling window and the like, the invention has the advantages of simple structure, no need of assembly welding, and easy processing and electroplating.
In this embodiment, the tilt axes of the tilt vias 15 are located on the central connecting line of two adjacent ceramic waveguide resonators 11, and the tilt axes may be moved in parallel as needed, that is, the tilt axes of the tilt vias 15 are parallel to the central connecting line. It is noted that the farther the tilt axis of the tilt via 15 is from the center line of the ceramic waveguide resonator 11, the smaller the capacitive coupling is generated.
In this embodiment, the inclined through-hole 15 has a circular cross-section to facilitate machining. In fact, the cross section of the inclined through hole 15 may be square, oval, irregular, or the like. Preferably, the inner surface of the inclined through hole 15 is also covered with a conductive plating layer, and a high-conductivity metal layer such as silver plating or copper plating is generally used to improve the performance.
Preferably, the ceramic waveguide filter 10 of the present invention can adjust the magnitude of the capacitive coupling amount by adjusting the width of the coupling bridge 13, the aperture of the inclined through-hole 15, and/or the inclination angle of the inclined through-hole 15.
(1) If the width of the coupling bridge 13 is increased, the amount of capacitive coupling is reduced. As shown in fig. 4, as the width of the coupling bridge 13 increases, the amount of capacitive coupling gradually decreases (a negative value represents that the coupling polarity is capacitive, and an absolute value represents the magnitude of the coupling amount). Thus, different amounts of inductive coupling can be obtained by adjusting the width dimension of the coupling bridges 13.
(2) If the aperture of the inclined through-hole 15 is increased within a predetermined interval range, the amount of capacitive coupling increases. As shown in fig. 5, the amount of capacitive coupling gradually increases as the aperture increases within a predetermined range of intervals. Thus, different amounts of inductive coupling can be obtained by adjusting the aperture of the inclined through-hole 15.
(3) If the inclination angle of the inclined through hole 15 is increased, the capacitive coupling amount is increased. As shown in fig. 6, as the tilt angle increases, the amount of capacitive coupling gradually increases, and the increase is more significant than the former two. Thus, different amounts of inductive coupling can be obtained by adjusting the angle of inclination of the inclined through-hole 15.
In the specific implementation process, the above parameters need to be adjusted comprehensively by combining the actual design size and the engineering implementation difficulty to obtain the required capacitive coupling amount, so as to implement the designed filter frequency response characteristic.
In summary, the ceramic waveguide filter of the present invention includes a plurality of ceramic waveguide resonators, and every two adjacent ceramic waveguide resonators are connected to each other through a coupling bridge, so as to realize the frequency selection characteristic of the ceramic filter. An inclined through hole penetrating through the upper surface and the lower surface of the ceramic waveguide filter is arranged at a coupling connection bridge between two adjacent ceramic waveguide resonators to generate required capacitive coupling, so that the frequency response characteristic of the ceramic filter is realized. Preferably, the present invention can adjust the magnitude of the capacitive coupling amount by adjusting the width of the coupling bridge, the aperture of the inclined through-hole and/or the inclination angle of the inclined through-hole. Therefore, compared with the existing method for realizing capacitive coupling of the deep blind hole or the snake-shaped window and the like, the ceramic waveguide filter has the advantages of simple structure, no need of assembly welding, and easiness in processing and electroplating.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A ceramic waveguide filter is characterized by comprising a plurality of ceramic waveguide resonators, wherein every two adjacent ceramic waveguide resonators are communicated through a coupling connecting bridge and are coupled with each other, the ceramic waveguide resonators are ceramic cuboid modules and are distributed in an array mode, a sinking blind hole is formed in the center of the upper surface of each ceramic waveguide resonator, the ceramic waveguide filter is formed by processing a whole ceramic material, and the ceramic waveguide resonators are partially divided by two cross dividing grooves in the middle; and an inclined through hole penetrating through the upper surface and the lower surface of the ceramic waveguide filter is arranged at the coupling connection bridge between at least two adjacent ceramic waveguide resonators, so that capacitive coupling is generated between the two adjacent ceramic waveguide resonators.
2. The ceramic waveguide filter according to claim 1, wherein the inclined via hole is provided at the coupling bridge between two adjacent ceramic waveguide resonators at an intermediate position of the ceramic waveguide filter.
3. The ceramic waveguide filter of claim 1, wherein the tilt axes of the tilt vias are located at or parallel to a center line of two adjacent ceramic waveguide resonators.
4. The ceramic waveguide filter of claim 1, wherein the cross-section of the slanted via is circular, square, elliptical, or irregular.
5. The ceramic waveguide filter according to claim 1, wherein a surface of the ceramic waveguide resonator and/or an inner surface of the inclined via hole is provided with a conductive plating layer.
6. The ceramic waveguide filter of claim 1, wherein the coupling bridge is made of a ceramic material.
7. The ceramic waveguide filter according to any one of claims 1 to 6, wherein the magnitude of the capacitive coupling amount is adjusted by adjusting a width of the coupling bridge, an aperture of the inclined through-hole, and/or an inclination angle of the inclined through-hole.
8. The ceramic waveguide filter according to claim 7, wherein the capacitive coupling amount is decreased if the width of the coupling bridge is increased;
if the aperture of the inclined through hole is increased within a preset interval range, the capacitive coupling amount is increased;
and if the inclination angle of the inclined through hole is increased, the capacitive coupling amount is increased.
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| CN201910343603.4A CN110137638B (en) | 2019-04-26 | 2019-04-26 | Ceramic waveguide filter |
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| CN201910343603.4A CN110137638B (en) | 2019-04-26 | 2019-04-26 | Ceramic waveguide filter |
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| CN110137638B true CN110137638B (en) | 2021-05-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110265753B (en) * | 2019-07-16 | 2023-10-27 | 深圳国人科技股份有限公司 | Dielectric waveguide filter |
| KR20210027060A (en) * | 2019-08-30 | 2021-03-10 | 주식회사 케이엠더블유 | Waveguide filter |
| CN110707399A (en) * | 2019-09-16 | 2020-01-17 | 江苏亨鑫科技有限公司 | Variable coupling structure of dielectric resonator and dielectric waveguide filter |
| CN114402483B (en) * | 2019-09-30 | 2023-08-22 | 华为技术有限公司 | Dielectric filter and communication device |
| CN110783668B (en) * | 2019-10-12 | 2021-02-09 | 京信通信技术(广州)有限公司 | Communication device, dielectric waveguide filter and capacitance coupling adjusting method thereof |
| CN111129667B (en) * | 2019-11-25 | 2021-02-12 | 江苏希奥飞尔微电子科技有限公司 | Negative coupling structure applied to dielectric waveguide filter and dielectric waveguide filter |
| CN211629271U (en) * | 2019-12-31 | 2020-10-02 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver apparatus including the same |
| CN211265679U (en) * | 2019-12-31 | 2020-08-14 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transmitting/receiving apparatus |
| US11955682B2 (en) | 2019-12-31 | 2024-04-09 | Telefonaktiebolaget Lm Ericsson (Publ) | CWG filter, and RU, AU or BS having the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208622910U (en) * | 2018-04-26 | 2019-03-19 | 苏州艾福电子通讯有限公司 | A kind of bimodulus ceramic waveguide filter |
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| GB201320995D0 (en) * | 2013-11-28 | 2014-01-15 | Radio Design Ltd | Ceramic waveguide filter apparatus and method of manufacture and use thereof |
| JP6572391B2 (en) * | 2015-11-27 | 2019-09-11 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Dielectric filters, transceivers, and base stations |
| CN107069155B (en) * | 2017-01-12 | 2019-07-30 | 深圳三星通信技术研究有限公司 | A kind of dielectric waveguide filter and its coupling inversion structures |
| CN206864584U (en) * | 2017-04-25 | 2018-01-09 | 四川省韬光通信有限公司 | A kind of dielectric waveguide filter |
| CN208622916U (en) * | 2018-09-25 | 2019-03-19 | 苏州艾福电子通讯有限公司 | A kind of ceramic dielectric waveguide filter |
| CN109546270B (en) * | 2019-01-11 | 2020-07-28 | 华为技术有限公司 | Filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208622910U (en) * | 2018-04-26 | 2019-03-19 | 苏州艾福电子通讯有限公司 | A kind of bimodulus ceramic waveguide filter |
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