CN212230586U - Filter - Google Patents
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- CN212230586U CN212230586U CN202021814648.XU CN202021814648U CN212230586U CN 212230586 U CN212230586 U CN 212230586U CN 202021814648 U CN202021814648 U CN 202021814648U CN 212230586 U CN212230586 U CN 212230586U
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Abstract
The utility model provides a filter, including two at least syntonizers, two negative coupling grooves that link up mutually, the conducting layer, through set up the debugging piece on the inner wall in first negative coupling groove, the projection that makes the lower surface of debugging piece on the wave filter lower surface covers the projection of second negative coupling groove on wave filter body lower surface completely, make and form the intercommunication chamber that extends along the horizontal direction between the lower surface of debugging piece and the tank bottom of first negative coupling groove, and realize the capacitive coupling between these two syntonizers through first negative coupling groove, second negative coupling groove, the intercommunication chamber, can produce the good wave filter body of uniformity in batches earlier, the debugging piece of refabrication different sizes changes the size in intercommunication chamber, thereby adjust the electric property of wave filter, debugging piece itself does not have fluting or hole, the error is little during the sintering, the precision is high, reproducibility is strong, high efficiency during this wave filter trial production, Low cost and suitability for batch production.
Description
Technical Field
The present application relates to the field of electronic communication devices, and more particularly, to a filter.
Background
With the advent of the "explosion" era of 5G communication, electronic communication devices are becoming widespread worldwide, and filters are an important part of electronic communication devices and determine key factors such as the radiation range and signal strength of electronic base stations.
The traditional filter has the defects of large volume, high loss, low dielectric constant and the like, and can not meet the requirement of 5G communication. Therefore, the waveguide filter has the advantages that the dielectric constant of the material is higher and the volume is smaller under the same resonance frequency. Along with the continuous improvement of the performance of the base station, the performance requirement of the filter is higher and higher, the traditional waveguide filter mostly adopts an inductive coupling mode, and is difficult to meet the specific electrical performance requirements such as the inhibition of the near end of the frequency band of the filter, and in order to solve the problem, the filter adopting capacitive coupling appears in the market, for example, international patent application WO 2018148905 a1 discloses a filter which realizes the capacitive coupling between resonant cavities by arranging a through hole and a conductive partition layer on a block, but the scheme needs to additionally arrange the conductive partition layer, has complex process, needs to use additional equipment, has high cost, for example, Chinese utility model patent CN111403872A discloses a dielectric filter which can realize the capacitive coupling without arranging the conductive partition layer, but when the scheme is matched with different electrical performances, the size of a first negative coupling groove and/or a second negative coupling groove is adjusted, The distance between the first negative coupling groove and the first debugging hole, the diameter and the length of the negative coupling hole are realized, a whole filter needs to be manufactured in a single trial production mode, the efficiency is low, the cost is high, certain errors can be generated during sintering after the size of the negative coupling groove or the negative coupling hole is adjusted, the reproducibility in the trial production process is poor, and the mass production is particularly inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's shortcoming, provide an efficient, with low costs, can conveniently carry out mass production's wave filter during trial-manufacturing.
In order to achieve the above object, the present invention adopts a technical solution that a filter includes at least two resonators, each resonator includes a resonator body made of a ceramic material and a tuning hole located on an upper surface of the resonator body, the tuning hole is a blind hole for tuning a resonant frequency of the resonator where the tuning hole is located; all the resonator bodies constitute a filter body, the filter body extending in a horizontal direction, the filter further comprising:
the first negative coupling groove is formed in the upper surface of the filter body and extends downwards, and the first negative coupling groove is a blind groove;
the second negative coupling groove is formed in the lower surface of the filter body and extends upwards, the second negative coupling groove is a blind groove, and the second negative coupling groove is communicated with the first negative coupling groove;
the conducting layer covers the surface of the filter body, the inner wall surface of the debugging hole and the inner wall surface of the second negative coupling groove;
a debugging block is arranged on the inner wall of the first negative coupling groove, the upper surface of the debugging block is positioned in an opening area of the first negative coupling groove on the upper surface of the filter body, the projection of the lower surface of the debugging block on the lower surface of the filter body completely covers the projection of the second negative coupling groove on the lower surface of the filter body, and a communicating cavity extending along the horizontal direction is formed between the lower surface of the debugging block and the groove bottom of the first negative coupling groove;
the conducting layer is also covered on the inner wall surface of the first negative coupling groove and the outer wall surface of the debugging block, and the combining surface of the first negative coupling groove and the debugging block is not covered with the conducting layer;
at least one of the first negative coupling groove, the second negative coupling groove and the communicating cavity is located at the connecting position of the two resonator bodies and is connected with the two resonators, and the first negative coupling groove, the second negative coupling groove and the communicating cavity are used for realizing capacitive coupling between the two resonators.
Preferably, an adhesive layer is arranged on a joint surface of the debugging block and the first negative coupling groove, and the adhesive layer is used for fixing the debugging block on the inner wall of the first negative coupling groove and preventing the conductive layer from entering.
Further preferably, the adhesive layer is formed by sintering an adhesive.
Preferably, the debugging block is embedded in the first negative coupling groove, and the debugging block at least has a side wall which is not attached to the inner wall of the first negative coupling groove.
Preferably, the material of the debugging block is the same as that of the resonator body.
Preferably, the axial lines of the debugging holes on the two resonators are parallel, and the central line of the first negative coupling groove and the central line of the second negative coupling groove are parallel to the axial line of the debugging hole.
Further preferably, the axial line of the debugging hole, the center line of the first negative coupling groove and the center line of the second negative coupling groove are located in the same plane.
Preferably, an opening of the first negative coupling groove on the upper surface of the filter body is rectangular, and an opening of the second negative coupling groove on the lower surface of the filter body is also rectangular.
Further preferably, the conductive layer is made of silver.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
the utility model provides a filter, including two at least syntonizers, first negative coupling groove, second negative coupling groove, the conducting layer, link up mutually through making these two negative coupling grooves, and set up the debugging piece on the inner wall in first negative coupling groove, make the projection of the lower surface of debugging piece on the filter lower surface cover the projection of second negative coupling groove on filter body lower surface completely, make and form the intercommunication chamber that extends along the horizontal direction between the lower surface of debugging piece and the tank bottom in first negative coupling groove, and realize the capacitive coupling between these two syntonizers through first negative coupling groove, second negative coupling groove, the intercommunication chamber, can produce the filter body that the uniformity is good in batches earlier, the debugging piece of different sizes of refabrication changes the size in intercommunication chamber, thereby adjust the electric property of filter, debugging piece itself does not have fluting or hole, the error is little during the sintering, The filter has high precision and strong reproducibility, is high in trial production efficiency and low in cost, and is suitable for batch 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 perspective view of a preferred embodiment of 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 partially enlarged view at B in fig. 3.
Fig. 5 is a schematic cross-sectional view taken along a-a in fig. 2, showing only the filter body and the tuning holes.
Fig. 6 is a process flow diagram of a method of manufacturing the present invention.
Wherein: 10. a filter; 101. a filter body; 20. a first resonator; 201. a first resonator body; 202. a first pilot hole; 30. a second resonator; 301. a second resonator body; 302. a second pilot hole; 41. a first negative coupling groove; 42. a second negative coupling groove; 43. a debugging block; 431. a communicating cavity; 50. an adhesive layer; 60. and a conductive layer.
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 some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection 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 the orientation or positional relationship based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-5, the present invention provides a filter 10, including a first resonator 20 and a second resonator 30, where the first resonator 20 includes a first resonator body 201 made of a ceramic material and a first tuning hole 202 located on an upper surface of the first resonator body 201, 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 20; the second resonator 30 comprises a second resonator body 301 made of a ceramic material and a second debugging hole 302 positioned on the upper surface of the second resonator body 301, the second debugging hole 302 is a blind hole, and the second debugging hole 302 is used for debugging the resonance frequency of the second resonator 30; the first resonator body 201 and the second resonator body 301 together constitute a filter body 101 of the filter 10, the filter body 101 extending in a horizontal direction; the filter 10 further includes a first negative coupling groove 41, a second negative coupling groove 42 and a conductive layer 60, wherein the first negative coupling groove 41 is opened on the upper surface of the filter body 101 and extends downward, and the first negative coupling groove 41 is a blind groove; the second negative coupling groove 42 is formed in the lower surface of the filter body 101 and extends upwards, the second negative coupling groove 42 is a blind groove, and the second negative coupling groove 42 is communicated with the first negative coupling groove 41; the conductive layer 60 is made of silver, and the conductive layer 60 covers the surface of the filter body 101 of the filter 10, the inner wall surfaces of the debugging hole 201 and the debugging hole 301, and the inner wall surface of the second negative coupling groove 42; the axial lines of the first debugging hole 202 and the second debugging hole 302 are parallel, and the central lines of the first negative coupling slot 41 and the second negative coupling slot 42 are parallel to the axial lines of the first debugging hole 202 and the second debugging hole 302.
As shown in fig. 2-4, the inner wall of the first negative coupling groove 41 is further provided with a debugging block 43, the upper surface of the debugging block 43 is located in the opening area of the first negative coupling groove 41 on the upper surface of the filter body 101, the projection of the lower surface of the debugging block 43 on the lower surface of the filter body 101 completely covers the projection of the second negative coupling groove 42 on the lower surface of the filter body 101, and a communicating cavity 431 extending in the horizontal direction is formed between the lower surface of the debugging block 43 and the groove bottom of the first negative coupling groove 41; the conductive layer 60 also covers the inner wall surface of the first negative coupling groove 41 and the outer wall surface of the debugging block 43, but the combined surface of the first negative coupling groove 41 and the debugging block 43 does not cover the conductive layer 60; at least one of the first negative coupling groove 41, the second negative coupling groove 42 and the communicating cavity 431 is located at a connecting position of the first resonator 20 and the second resonator 30, in the embodiment, the first negative coupling groove 41 and the communicating cavity 431 are located at the connecting position and are connected with the first resonator 20 and the second resonator 30, and the first negative coupling groove 41, the second negative coupling groove 42 and the communicating cavity 431 jointly act to realize capacitive coupling between the first resonator 20 and the second resonator 30.
In this embodiment, the debugging block 43 is made of the same material as the first resonator body 201 and the second resonator body 301, and is made of a ceramic material, as shown in fig. 3-4, an adhesive layer 50 is disposed on a joint surface between the debugging block 43 and the first negative coupling groove 41, the adhesive layer 50 is formed by sintering an adhesive for bonding the debugging block 43 to an inner wall of the first negative coupling groove 41, the adhesive layer 50 formed by sintering the adhesive can further enhance a fixing effect of fixing the debugging block 43 to the inner wall of the first negative coupling groove 41, and the adhesive layer 50 fills a joint portion between the debugging block 43 and the first negative coupling groove 41, so that the conductive layer 60 is difficult to enter, and cannot cover the joint surface between the debugging block 43 and the first negative coupling groove 41.
As shown in fig. 1 to 4, an opening of the first negative coupling groove 41 on the upper surface of the filter body 101 is rectangular, an opening of the second negative coupling groove 42 on the lower surface of the filter body 101 is also rectangular, the debugging block 43 is a rectangular parallelepiped, the debugging block 43 is embedded in the first negative coupling groove 41, the embedding means that three sides of the debugging block 43 are all connected with an inner wall of the first negative coupling groove 41 through the adhesive layer 50, and the remaining one side of the debugging block 43 is not attached to the inner wall of the first negative coupling groove 41.
The utility model provides a filter, through first negative coupling groove 41, second negative coupling groove 42, the combined action of intercommunication chamber 431 realizes the capacitive coupling between first syntonizer 20 and the second syntonizer 30, can produce the filter body 101 that the uniformity is good in batches earlier, the debugging piece 43 of refabrication equidimension changes the size of intercommunication chamber 431, thereby change filter 10's electrical property, thereby match different electrical property requirements, debugging piece 43 itself does not have fluting or hole, error during the sintering is little, the precision is high, reproducibility is strong, this filter is efficient when the trial-manufacture, and is low in cost, and is suitable for mass production.
The utility model also provides a manufacturing method of making above-mentioned wave filter, its process flow is shown in figure 6, specifically includes following step:
a. dry-pressing and molding the ceramic powder to prepare a green body of the filter body 101 with a first negative coupling groove 41, a second negative coupling groove 42, a first debugging hole 201 and a second debugging hole 301; dry pressing the ceramic powder to form a green body of the debugging block 43;
b. sintering the green body of the filter body 101 and the green body of the debugging block 43 into ceramic to manufacture the filter body 101 and the debugging block 43;
c. bonding the debugging block 43 in the first negative coupling groove 41 through an adhesive, sintering and molding to solidify the adhesive into an adhesive layer 50, so as to manufacture a semi-finished product of the filter 10;
d. and (3) carrying out silver immersion or silver spraying treatment on the semi-finished product, forming a conductive layer 60 on the semi-finished product, wherein due to the existence of the adhesive layer 50, the joint surface of the debugging block 43 and the first negative coupling groove 41 is difficult to process during silver immersion or silver spraying, so that the conductive layer 60 cannot cover the joint surface of the debugging block 43 and the first negative coupling groove 41, and obtaining the filter 10.
The manufacturing method is simple in processing technology, high in yield and suitable for batch 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 (9)
1. A filter comprises at least two resonators, wherein each resonator comprises a resonator body made of ceramic materials and a debugging hole positioned on the upper surface of the resonator body, 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 resonator bodies constitute a filter body, the filter body extending in a horizontal direction, the filter further comprising:
the first negative coupling groove is formed in the upper surface of the filter body and extends downwards, and the first negative coupling groove is a blind groove;
the second negative coupling groove is formed in the lower surface of the filter body and extends upwards, the second negative coupling groove is a blind groove, and the second negative coupling groove is communicated with the first negative coupling groove;
the conducting layer covers the surface of the filter body, the inner wall surface of the debugging hole and the inner wall surface of the second negative coupling groove;
the method is characterized in that:
a debugging block is arranged on the inner wall of the first negative coupling groove, the upper surface of the debugging block is positioned in an opening area of the first negative coupling groove on the upper surface of the filter body, the projection of the lower surface of the debugging block on the lower surface of the filter body completely covers the projection of the second negative coupling groove on the lower surface of the filter body, and a communicating cavity extending along the horizontal direction is formed between the lower surface of the debugging block and the groove bottom of the first negative coupling groove;
the conducting layer is also covered on the inner wall surface of the first negative coupling groove and the outer wall surface of the debugging block, and the combining surface of the first negative coupling groove and the debugging block is not covered with the conducting layer;
at least one of the first negative coupling groove, the second negative coupling groove and the communicating cavity is located at the connecting position of the two resonator bodies and is connected with the two resonators, and the first negative coupling groove, the second negative coupling groove and the communicating cavity are used for realizing capacitive coupling between the two resonators.
2. The filter according to claim 1, wherein an adhesive layer is disposed on a joint surface of the debug block and the first negative coupling groove, and the adhesive layer is used for fixing the debug block on an inner wall of the first negative coupling groove and preventing the conductive layer from entering.
3. The filter of claim 2, wherein the adhesive layer is sintered from an adhesive.
4. The filter of claim 1, wherein the debugging block is embedded in the first negative coupling groove, and the debugging block has at least one side wall which is not attached to the inner wall of the first negative coupling groove.
5. The filter of claim 1, wherein the tuning block is made of the same material as the resonator body.
6. The filter of claim 1, wherein the axes of the debugging holes on the two resonators are parallel, and the center line of the first negative coupling slot and the center line of the second negative coupling slot are parallel to the axis of the debugging hole.
7. The filter of claim 6, wherein the axis of the pilot hole, the centerline of the first negative coupling groove, and the centerline of the second negative coupling groove are located in the same plane.
8. The filter of claim 1, wherein the opening of the first negative coupling groove on the upper surface of the filter body is rectangular, and the opening of the second negative coupling groove on the lower surface of the filter body is also rectangular.
9. The filter according to any of claims 1-8, wherein the conductive layer is made of silver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021814648.XU CN212230586U (en) | 2020-08-26 | 2020-08-26 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021814648.XU CN212230586U (en) | 2020-08-26 | 2020-08-26 | Filter |
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| Publication Number | Publication Date |
|---|---|
| CN212230586U true CN212230586U (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021814648.XU Active CN212230586U (en) | 2020-08-26 | 2020-08-26 | Filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038738A (en) * | 2020-08-26 | 2020-12-04 | 江苏灿勤科技股份有限公司 | Filter and manufacturing method thereof |
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2020
- 2020-08-26 CN CN202021814648.XU patent/CN212230586U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038738A (en) * | 2020-08-26 | 2020-12-04 | 江苏灿勤科技股份有限公司 | Filter and manufacturing method thereof |
| CN112038738B (en) * | 2020-08-26 | 2024-04-26 | 江苏灿勤科技股份有限公司 | Filter and manufacturing method thereof |
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