CN109818121B - Cavity filter device and cavity cover plate assembly thereof - Google Patents
Cavity filter device and cavity cover plate assembly thereof Download PDFInfo
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- CN109818121B CN109818121B CN201910167858.XA CN201910167858A CN109818121B CN 109818121 B CN109818121 B CN 109818121B CN 201910167858 A CN201910167858 A CN 201910167858A CN 109818121 B CN109818121 B CN 109818121B
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Abstract
The invention relates to a cavity filter device and a cavity cover plate assembly thereof. The cover plate comprises a substrate, a metal layer covered on the outer surface of the substrate and a metal sheet formed on the inner surface of the substrate. And debugging through holes are formed in positions, corresponding to the resonant cavities and the coupling channels, of the cover plate. The cover plate with the printed board structure is adopted to replace the traditional metal cover plate, the metal layer is matched with the metal cavity to form a closed shielding space, and the metal sheet is coupled or electrically connected with the corresponding resonant column, so that the resonant frequency is effectively reduced. Therefore, the corresponding index requirement can be achieved under the condition that the movable resonance column with a disc is not used, and therefore, the height of the metal cavity is small. By controlling the depth of the tuning rod inserted into the metal cavity, the resonant frequency and the coupling amount can be adjusted. Further, the excess portion of the tuning rod is sheared and its end is flush with the outer surface of the cover plate. Therefore, the cavity filter device can ensure excellent electrical indexes and realize miniaturization, light weight and low cost.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a cavity filter device and a cavity cover plate assembly thereof.
Background
The introduction of the 5G Missive MIMO technology greatly increases the number of filters integrated with the antenna, and puts higher requirements on the weight, volume and cost of the filters. At present, common base station filter types comprise a metal cavity filter and a ceramic dielectric filter, and the ceramic dielectric filter has the advantages of light weight and small volume, but the development of the prior art is not mature enough, and the mass production consistency and the cost have great challenges. Currently, in order to advance 5G construction faster, miniaturized metal cavity filters are the preferred transition scheme.
However, due to the requirements of small volume, light weight and low cost of the 5G filter, the miniaturization scheme of the existing metal cavity filter is not satisfactory. For example, in order to reduce the frequency in a small volume, a movable resonance column with a disc is adopted, and in order to compensate various errors, debugging and the like are performed by adopting a self-locking screw or a knocking scheme, so that the requirements of small volume, light weight and low cost cannot be met at the same time.
Disclosure of Invention
Based on this, it is necessary to provide a cavity filter device and a cavity cover plate assembly thereof that can achieve miniaturization, light weight, and low cost while ensuring excellent electrical indexes, in view of the drawbacks of the conventional metal cavity filters.
A chamber lid assembly, comprising:
the cover plate comprises a substrate with opposite outer surfaces and inner surfaces and a metal layer covered on the outer surfaces of the substrate, wherein a coupling area preset on the inner surfaces of the substrate is formed with a plurality of metal sheets, and a tuning area preset on the cover plate is provided with a plurality of debugging through holes; a kind of electronic device with high-pressure air-conditioning system
And the tuning rod can be penetrated in the debugging through hole and can slide along the axial direction of the debugging through hole in an operable way.
In one embodiment, a metal strip is covered at a preset position on the inner surface of the substrate to form a welding area, and a metallized shielding via hole for connecting the metal layer and the metal strip is formed in the welding area.
In one embodiment, the tuning rod is a metal needle, and the cross section of the metal needle is polygonal.
In one embodiment, the tuning rod is a self-tapping screw.
A cavity filter device comprising:
the metal cavity is of a hollow structure with one side open, a plurality of resonant cavities mutually coupled through coupling channels are formed in the metal cavity, and a resonant column is arranged in each resonant cavity; a kind of electronic device with high-pressure air-conditioning system
The cavity cover plate assembly according to any of the above preferred embodiments, wherein:
the cover plate covers the opening of the metal cavity, the plurality of metal sheets correspond to the plurality of resonant cavities respectively, each resonant column is coupled with the corresponding metal sheet and insulated from the metal layer, and the debugging via hole corresponds to the plurality of resonant cavities and the coupling channel respectively;
the tuning rod penetrates through the debugging through hole and stretches into the metal cavity to a preset depth, and the part of the tuning rod protruding out of the outer surface is sheared.
In one embodiment, the resonant column and the metal cavity are integrally formed.
In one embodiment, the resonant column is a hollow column structure, and one end of the tuning rod corresponding to the resonant column is inserted into the resonant column in a non-contact manner.
In one embodiment, the tuning rod further comprises a medium sleeve, and the medium sleeve is sleeved on the tuning rod and clamped between the outer wall of the tuning rod and the inner wall of the resonance column.
In one embodiment, the resonant columns are abutted with the corresponding metal sheets and are electrically connected;
or the top surface of the resonance column is arranged at intervals with the corresponding metal sheet, and the metal sheet is electrically connected with the metal layer.
In one embodiment, when the metal sheet is electrically connected to the metal layer, a metallized connection hole is formed at a position of the cover plate corresponding to the metal sheet, so as to electrically connect the metal sheet and the metal layer.
According to the cavity filter device, the cover plate of the printed plate structure is adopted to replace the traditional metal cover plate, the metal layer is matched with the metal cavity to form a closed shielding space, and the metal sheet is coupled or electrically connected with the corresponding resonant column, so that the resonant frequency is effectively reduced. Therefore, the corresponding index requirement can be achieved under the condition that the movable resonance column with a disc is not used, and therefore, the height of the metal cavity is small. By controlling the depth of the tuning rod inserted into the metal cavity, the resonant frequency and the coupling amount can be adjusted. Further, the excess portion of the tuning rod is sheared and its end is flush with the outer surface of the cover plate. Therefore, the cavity filter device ensures excellent electrical indexes and realizes miniaturization, light weight and low cost of the filter.
Drawings
FIG. 1 is a schematic diagram of a cavity filter according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a cover plate in the cavity filter device shown in FIG. 1;
fig. 3 is a schematic view of a structure of the cover plate of the cavity filter device shown in fig. 1 at another angle.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present invention provides a cavity filter device 100 and a cavity cover assembly (not shown), where the cavity filter device 100 may be any of a filter, a duplexer, a combiner, and other communication devices. The cavity filter device 100 in the preferred embodiment of the present invention includes a metal cavity 110 and a cavity cover assembly. The cavity cover assembly includes a cover 120 and a tuning rod 130.
The metal cavity 110 is a hollow structure with one side open. Generally elongated, and has a cavity formed along the longitudinal direction. A plurality of resonant cavities (not shown) are formed in the metal cavity 110, and are coupled to each other and sequentially connected through coupling channels (not shown), thereby forming a filtering path. The side wall of the metal cavity 110 is provided with a signal connector 113, and the first resonant cavity and the second resonant cavity are respectively connected with the corresponding signal connector 113 so as to realize signal input or output. Specifically, the plurality of resonant cavities are coaxial resonant cavities. According to the electrical index requirement, inductive coupling or capacitive coupling is realized among the resonant cavities through windowing or flying bars. At this time, the coupling channels are respectively corresponding to windowed or flying bars.
A resonant column 111 is provided within each resonant cavity. In this embodiment, the resonant pillar 111 and the metal cavity 110 are integrally formed. The resonant pillars 111 may be integrally formed with the metal cavity 110 by integral die casting or machining. The cost can be significantly reduced compared to the form of movable-band-disc resonating posts employed in conventional miniaturized filters.
Referring to fig. 2 and 3, the cover plate 120 covers the opening of the metal cavity 110. Accordingly, the cover plate 120 is mated with the metal cavity 110, forming a closed shielding space for signal transmission inside the metal cavity 110. The cover plate 120 includes a substrate 121, a metal layer 123, and a metal sheet 125.
The substrate 121 is made of insulating material, has a plate shape and is matched with the opening shape of the metal cavity 110. The surface of the substrate 121 facing the inner wall of the metal cavity 110 is referred to as an inner surface, and the surface of the opposite side is referred to as an outer surface. The metal layer 123 is disposed on the outer surface of the substrate 121. Specifically, the metal layer 123 may be a metal film layer structure such as a copper film or an aluminum film formed by vapor deposition, sputtering, or the like.
The inner surface of the substrate 121 has a predetermined coupling region (not shown) corresponding to the positions of the plurality of resonant cavities. A plurality of metal sheets 125 are formed in the coupling region. That is, the metal sheet 125 corresponds to the positions of the plurality of resonant cavities. Thus, the metal sheet 125 may be coupled or electrically connected with the resonant pillars 111 within the corresponding resonant cavities. The metal sheet 125 may be formed by coating a film on the inner surface of the substrate 121, and then etching to obtain a metal foil structure with a predetermined shape and at a predetermined position. The metal sheet 125 is generally circular, although it may be rectangular or any other shape.
Each of the resonant pillars 111 is coupled or electrically connected to the corresponding metal sheet 125 and insulated from the metal layer 123, thereby effectively lowering the resonant frequency without increasing the structure of the resonant pillar 111.
In one embodiment, the resonant pillars 111 abut and electrically connect with the corresponding metal sheet 125, and the metal sheet 125 is insulated from the metal layer 123.
Specifically, the resonant pillars 111 are columnar structures, and the top surfaces thereof extend to contact the corresponding metal sheets 125. The resonating posts 111 may be electrically connected to the metal sheet 125 by soldering. At this time, the metal sheet 125 corresponds to the resonance plate of the resonance post 111, thereby effectively lowering the resonance frequency of the resonance post 111 at a lower cost and a smaller size of the resonance post.
In another embodiment, the top surface of the resonant column 111 is spaced apart from the corresponding metal sheet 125, and the metal sheet 125 is electrically connected to the metal layer 123 and is grounded to the cavity 110. In this way, the resonant frequency can be effectively reduced by the capacitive coupling between the metal sheet 125 and the top surface of the resonant column 111. Meanwhile, the structure also improves the Q value of the cavity filter device 100 and reduces the insertion loss.
In order to achieve good electrical connection between the metal sheet 125 and the metal layer 123, in this embodiment, a metallization connection hole 126 is formed at a position corresponding to the metal sheet 125 of the cover plate 120 to electrically connect the metal sheet 125 and the metal layer 123.
Specifically, the metallized connection hole 126 is a metallized via hole, which performs a conductive function, thereby realizing the electrical connection between the metal sheet 125 and the metal layer 123 at low cost. Furthermore, a plurality of metallized connection holes 126 are generally distributed on each metal sheet 125 and disposed along the circumferential direction of the metal sheet 125.
The cover plate 120 has a predetermined tuning area (not shown) corresponding to the positions of the plurality of resonant cavities and the coupling channels. Further, the tuning area is provided with a plurality of debug vias 127. That is, the plurality of debug vias 127 correspond to the positions of the plurality of resonant cavities and the coupling channels, respectively. Debug via 127 is a metallized via, the walls of which may be conductive. The debug via 127 comprises two portions, one of which passes through the metal plate 125 and can be used to adjust the resonant frequency of the resonant cavity. And the other part passes through the coupling channel between two adjacent resonant cavities and can be used for adjusting the coupling quantity of the two adjacent resonant cavities.
Wherein the debug via 127 is not in direct contact with the metal sheet 125. Specifically, the metal sheet 125 is grooved (not shown) along the circumferential direction of the opening of the debug via 127, so as to isolate the metal sheet 125 from the debug via 127.
The tuning rod 130 may be sheared. Specifically, the tuning rod 130 may be a thin or soft metal rod, or may be sheared by providing a breakpoint structure on the tuning rod 130. The number of tuning rods 130 that are adapted to the debug vias 127 is a plurality and may be selected as desired when processing the cavity filter device 100. The tuning rod 130 may be inserted through the tuning via 127 and may be operatively slid along an axial direction of the tuning via 127. Thus, the tuning rod 130 is operated to control the depth of the tuning rod 130 extending into the metal cavity 110.
The tuning rods 130 extend to different depths and are coupled by different amounts, thereby achieving adjustment of the resonant frequency of each resonant cavity and the amount of coupling between two adjacent resonant cavities. When the cavity filter device 100 is manufactured, the tuning rod 130 is first inserted into the debugging via hole 127, and then the tuning rod 130 is moved along the axial direction of the debugging via hole 127, so that the electric parameters of the cavity filter device 100 can be debugged. After the debugging is completed, the tuning rod 130 is welded with the metal layer 123, and the part of the tuning rod 130 protruding from the outer surface of the cover 120 is removed by shearing, machining or the like, so that the volume of the cavity filter device 100 can be further reduced.
Tuning rod 130 is typically a metal rod-like structure, which may be a threaded rod or a polished rod. In one embodiment, tuning rod 130 is a metal pin, and the cross-section of the metal pin is polygonal. The metal needle has simple structure and low cost, and can further reduce the cost of the cavity filter device 100. The cross section of the metal pin is polygonal, so that the metal pin can be clamped with the debug via 127. Therefore, the metal needle is not easy to loosen in the debugging process. Wherein the cross section of the common metal needle is square.
In another embodiment, tuning rod 130 may also be a self-tapping screw. The self-tapping screw is different from common screws, does not comprise a nut and a bolt head, and can be screwed by using a socket head cap wrench and other similar tools. Correspondingly, the debug via 127 may be a through hole having a bore diameter slightly smaller than the outer diameter of the self-tapping screw. When in debugging, the debugging through hole 127 can be opened in a smaller range by screwing the self-tapping screw, so that self-tapping is realized. At this time, the self-tapping screw is tightly matched with the debugging via 127 all the time in the debugging process, so that looseness is avoided.
In this embodiment, the resonant column 111 has a hollow columnar structure, and one end of the tuning rod 130 corresponding to the resonant column 111 is inserted into the resonant column 111 in a non-contact manner. The partial tuning rod 130 refers to a tuning rod 130 that adjusts the resonant frequency of each resonant cavity. By sleeving the resonant column 111 and the tuning rod 130, the relative area of the resonant column and the tuning rod can be increased, so that the coupling amount is increased, and the resonant frequency of the resonant cavity is further reduced.
Further, in the present embodiment, the cavity filter device 100 further includes a dielectric sleeve 140. The dielectric sleeve 140 is sleeved on the tuning rod 130 and clamped between the outer wall of the tuning rod 130 and the inner wall of the resonant column 111.
Specifically, the dielectric sleeve 140 is made of insulating materials such as plastic, rubber, and silica gel, so as to increase the friction between the tuning rod 130 and the resonator column 111. Therefore, the large friction force between the two can play a role in limiting and fixing during adjustment, so that the tuning rod 130 is prevented from loosening, and the tuning rod 130 is prevented from continuously displacing after the adjustment is completed. At the same time, the dielectric sleeve 140 may also prevent the tuning rod 130 from shorting to the resonating post 111 and increase the amount of capacitive coupling between the two to further reduce the resonant frequency.
In the present embodiment, the cover plate 120 is fixed to the metal cavity 110 by welding. The welding method can reduce the height of the metal cavity 110 as compared with the conventional screw fastening method, thereby facilitating miniaturization of the cavity filter device 100.
Further, in the present embodiment, the preset position of the inner surface of the substrate 121 is covered with the metal strip 129 to form a welding area (not shown). The metal strip 129 is also a strip-shaped metal layer structure, and may be formed in the same manner as the metal sheet 125. However, the metal strip 129 is isolated from the metal sheet 125. Wherein the weld area matches the contour of the cavity wall of the metal cavity 110.
Specifically, the weld area is generally located at the edge of the cover plate 120 and at the cavity wall between the resonant cavities. The solder area is formed with a metallized shielded via 128 connecting the metal layer 123 and the metal strip 129 so that the two are electrically connected together.
When the cover plate 120 is installed, the welding area is aligned with the cavity wall of the metal cavity 110, and the metal strip 129 is welded with the cavity wall of the metal cavity 110, so that the cover plate 120 is fixed. The metal strip 129 cooperates with the metallized shield via 128 to make the metal layer 123 electrically connected in common with the metal cavity 110.
In the cavity filter device 100, the cover plate 120 with a printed board structure is used to replace the traditional metal cover plate, the metal layer 123 is matched with the metal cavity 110 to form a closed shielding space, and the metal sheet 125 is coupled or electrically connected with the corresponding resonant column 111, so that the resonant frequency is effectively reduced. Therefore, the corresponding index requirements can be achieved without using the movable resonance column with a disc, so that the height of the metal cavity 110 is smaller. By controlling the depth of insertion of tuning rod 130 into metal cavity 110, an adjustable resonant frequency and amount of coupling may be achieved. . Further, the excessive portion of the tuning rod 130 is sheared, and its end is flush with the outer surface of the cover plate 120. Therefore, the cavity filter device 100 is miniaturized, lightweight, and low-cost while ensuring excellent electrical indexes.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in 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 several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A cavity filter device, comprising:
the metal cavity is of a hollow structure with one side open, a plurality of resonant cavities mutually coupled through coupling channels are formed in the metal cavity, and a resonant column is arranged in each resonant cavity; a kind of electronic device with high-pressure air-conditioning system
Cavity apron subassembly, cavity apron subassembly includes: a cover plate and a plurality of shearable tuning rods; the cover plate comprises a substrate with opposite outer surfaces and inner surfaces and a metal layer covered on the outer surfaces of the substrate, a plurality of metal sheets are formed in a coupling area preset on the inner surfaces of the substrate, and a plurality of debugging through holes are formed in a tuning area preset on the cover plate; the tuning rod is adapted to the debugging through hole, can penetrate through the debugging through hole and stretches into the metal cavity to a preset depth, and the part of the tuning rod protruding out of the outer surface is sheared;
wherein: the cover plate covers the opening of the metal cavity, the plurality of metal sheets correspond to the plurality of resonant cavities respectively, each resonant column is coupled with the corresponding metal sheet and insulated from the metal layer, and the debugging via hole corresponds to the plurality of resonant cavities and the coupling channel respectively;
the debugging via hole is a metallized via hole, and the hole wall of the debugging via hole is conductive; the debugging via hole comprises two parts, wherein one part passes through the metal sheet and is used for adjusting the resonant frequency of the resonant cavity; the other part passes through a coupling channel between two adjacent resonant cavities and is used for adjusting the coupling quantity of the two adjacent resonant cavities; the metal sheet is provided with a groove along the circumferential direction of the debugging through hole opening so as to isolate the metal sheet from the debugging through hole.
2. The cavity filter device according to claim 1, wherein the predetermined position of the inner surface of the substrate is covered with a metal strip to form a soldering region, and the soldering region is formed with a metallized shielding via hole connecting the metal layer and the metal strip.
3. The cavity filter device according to claim 1, wherein the tuning rod is a metal pin, and the cross section of the metal pin is polygonal.
4. The cavity filter device of claim 1, wherein the tuning rod is a self-tapping screw.
5. The cavity filter according to claim 1, wherein the substrate is made of an insulating material, is plate-shaped, and is matched with the opening shape of the metal cavity.
6. The cavity filter device of claim 1, wherein the resonating post is of unitary construction with the metal cavity.
7. The cavity filter according to claim 1, wherein the resonance post has a hollow columnar structure, and one end of the tuning rod corresponding to the resonance post is inserted into the resonance post in a non-contact manner.
8. The cavity filter device of claim 7, further comprising a dielectric sleeve, the dielectric sleeve being disposed over the tuning rod and clamped between an outer wall of the tuning rod and an inner wall of the resonating column.
9. The cavity filter device according to any one of claims 1 to 7, wherein the resonant pillars abut against and are electrically connected to the corresponding metal sheets;
or the top surface of the resonance column is arranged at intervals with the corresponding metal sheet, and the metal sheet is electrically connected with the metal layer.
10. The cavity filter according to claim 9, wherein when the metal sheet is electrically connected to the metal layer, a metallized connection hole is formed at a position of the cover plate corresponding to the metal sheet so as to electrically connect the metal sheet and the metal layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535232 | 2018-12-14 | ||
| CN2018115352321 | 2018-12-14 |
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| CN109818121A CN109818121A (en) | 2019-05-28 |
| CN109818121B true CN109818121B (en) | 2023-09-29 |
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| CN201910167858.XA Active CN109818121B (en) | 2018-12-14 | 2019-03-06 | Cavity filter device and cavity cover plate assembly thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677135A (en) * | 2019-10-28 | 2020-01-10 | 北京联恒众达科技中心(有限合伙) | Multichannel isolation filter box structure convenient to maintain and debug |
| CN111009709B (en) * | 2019-12-25 | 2024-03-26 | 京信通信技术(广州)有限公司 | Band-stop filter and combiner |
| CN114055606A (en) * | 2020-07-29 | 2022-02-18 | 广东博智林机器人有限公司 | Mould welt subassembly and mould device |
| CN112968287A (en) * | 2021-04-06 | 2021-06-15 | 广州智讯通信系统有限公司 | Tunable slot antenna and multi-band antenna system |
| CN114614223B (en) * | 2022-03-23 | 2023-11-24 | 京信射频技术(广州)有限公司 | Base station antenna and cavity filter |
| CN114927843B (en) * | 2022-05-16 | 2023-11-24 | 京信射频技术(广州)有限公司 | Filter and communication device |
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| KR20150118768A (en) * | 2014-04-15 | 2015-10-23 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
| CN205595431U (en) * | 2016-01-27 | 2016-09-21 | 成都鼎桥通信技术有限公司 | Low frequency band -pass cavity filter |
| CN107851871A (en) * | 2015-06-30 | 2018-03-27 | 华为技术有限公司 | A kind of resonator and wave filter |
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| KR20110000320U (en) * | 2009-07-06 | 2011-01-13 | 신갑재 | The structure of Resonator with two-stage tuning screw |
| KR20150118768A (en) * | 2014-04-15 | 2015-10-23 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
| CN107851871A (en) * | 2015-06-30 | 2018-03-27 | 华为技术有限公司 | A kind of resonator and wave filter |
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