CN113258245B - Method for manufacturing dielectric filter - Google Patents
Method for manufacturing dielectric filter Download PDFInfo
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- CN113258245B CN113258245B CN202110325166.0A CN202110325166A CN113258245B CN 113258245 B CN113258245 B CN 113258245B CN 202110325166 A CN202110325166 A CN 202110325166A CN 113258245 B CN113258245 B CN 113258245B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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Abstract
The invention provides a method for manufacturing a dielectric filter, wherein the dielectric filter comprises a plurality of dielectric blocks which are stacked, and the method comprises the following steps: (1) obtaining the size requirement according to the frequency and the coupling requirement of the dielectric filter, and manufacturing a dielectric block, a spacer, a cavity and a cover plate according to the size requirement; (2) stacking and assembling the dielectric blocks and the spacers according to a cross arrangement sequence, and mutually fixing the dielectric blocks and the spacers in a welding or sintering manner to form a dielectric block splicing piece; (3) putting the fixed dielectric block splicing piece into the cavity, and enabling the spacer to be in contact with and fixed on the inner wall of the cavity; (4) and a cover plate is arranged at the opening of the cavity body to seal the cavity body. The invention reduces the working procedures, saves the processing working hours and the cost, and the cavity is of an integrated structure, and has convenient manufacture and installation, better shielding property and stable performance.
Description
Technical Field
The invention belongs to the field of filters, and particularly relates to a manufacturing method of a dielectric filter.
Background
With the continuous development of modern communication technology, the requirements on filters are higher and higher, and a small-size, high-performance, high-power and low-cost filter technology is particularly important for filters in wireless communication applications.
The existing dielectric filter manufacturing method is complex, so that the production period is long, the cost is high, the product precision is low, the performance is unstable, the reject ratio is high, and the existing requirements cannot be met.
Disclosure of Invention
The invention aims to provide a manufacturing method of a dielectric filter, which aims to solve the problems of complexity, high cost, low precision and unstable performance of the conventional manufacturing method of the dielectric filter.
The invention is realized by the following steps:
the invention provides a method for manufacturing a dielectric filter, wherein the dielectric filter comprises a plurality of dielectric blocks which are stacked, and the method comprises the following steps:
(1) obtaining the size requirement according to the frequency and the coupling requirement of the dielectric filter, and manufacturing a dielectric block, a spacer, a cavity and a cover plate according to the size requirement;
(2) stacking and assembling the dielectric blocks and the spacers in a crossed arrangement order, and mutually fixing the dielectric blocks and the spacers in a welding or sintering manner to form a dielectric block splicing piece;
(3) placing the fixed dielectric block splicing piece into a cavity, and contacting and fixing the spacer with the inner wall of the cavity;
(4) and a cover plate is arranged at the opening of the cavity body to seal the cavity body.
Further, the manufacturing method of the dielectric block in the step (1) is as follows:
(a) pressing a dielectric block green body with a required shape by adopting a mould;
(b) sintering the dielectric block green body;
(c) finely grinding the sintered dielectric blocks;
(d) a pattern corresponding to the coupling window is formed on the finely ground dielectric block.
Further, the manufacturing method of the spacer in the step (1) comprises the following steps: and processing a positioning groove for positioning the medium block at the position fixed with the medium block on the spacer.
Further, the method for manufacturing the spacer in the step (1) further comprises: and further processing a trough for placing solder or silver paste in the positioning groove, wherein at least part of the trough exceeds the edge of the medium block.
Further, the manufacturing method of the spacer in the step (1) comprises the following steps: and processing a trough for placing solder or silver paste at a position fixed with the dielectric block on the spacer, wherein at least part of the trough exceeds the edge of the dielectric block.
Further, the manufacturing method of the spacer in the step (1) is as follows:
(a) selecting a section according to the thickness requirement of the spacer;
(b) stamping the section bar to form a required outline contour and a coupling window;
(c) processing a positioning groove on the section bar;
(d) further processing a trough in the positioning groove;
(e) and electroplating a metal layer on the surface of the processed profile.
Further, in the step (2), the fixing manner of the medium block and the spacer is as follows: in the process of assembling each dielectric block and each spacer, solder is put into or silver paste is poured into the trough of each spacer, the dielectric blocks are well contacted with the solder or the silver paste, and after the assembly is finished, the dielectric blocks and the spacers are pressed tightly by a jig and then are put into a high-temperature furnace for welding or sintering.
Furthermore, in the step (3), the inner wall of the cavity is provided with a clamping groove corresponding to each spacer, and each spacer is clamped in the corresponding clamping groove and fixed in a welding manner.
Further, a resonant rod is arranged on a cover plate or a cavity of the dielectric filter.
Further, the step (4) is followed by: a tuning screw and a coupling screw are installed.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the manufacturing method of the dielectric filter, the dielectric blocks and the spacers are assembled and fixed to form the dielectric block splicing piece, and then the whole dielectric block splicing piece is placed into the cavity and sealed and fixed, so that the working procedures are reduced, the processing time is saved, the cost is saved, the cavity is of an integrated structure, the manufacturing and the installation are convenient, and the performance is stable;
(2) according to the invention, the positioning groove for positioning the medium block is processed on the spacer, so that the medium is conveniently centered in the assembling process, the consistency and the accuracy of the product are ensured, and the product performance is stable;
(3) according to the invention, the trough for placing the solder or the silver paste is processed on the spacer, so that the solder or the silver paste can be prevented from overflowing, a coupling window on the spacer and a hole on the dielectric block are prevented from being blocked, the forming thickness of the solder can be accurately controlled, and the production consistency and the product reliability are improved; the silo at least part surpasss the edge of dielectric block, and the silo surpasss the part at dielectric block edge, and the welding in-process air discharge of being convenient for reduces the hollowing between solder or silver thick liquid and the spacer, improves connection quality.
Drawings
Fig. 1 is a schematic diagram of an assembly process of a method for manufacturing a dielectric filter according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a spacer according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a dielectric block according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of an assembly process of a method for manufacturing a dielectric filter according to embodiment 2 of the present invention.
Description of reference numerals: 1-spacer, 11-coupling window, 12-positioning groove, 13-trough, 2-solder, 3-dielectric block, 31-pattern, 32-hole, 33-corner cut, 4-dielectric block component, 5-dielectric block splicing component, 6-cavity, 61-clamping groove, 7-bottom plate, 71-resonance rod, 8-top plate and 81-tuning screw hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, an embodiment of the present invention provides a method for manufacturing a dielectric filter, where the dielectric filter includes a plurality of dielectric blocks 3 stacked in a stacked manner, the method including the steps of:
(1) obtaining size requirements according to the frequency and coupling requirements of the dielectric filter, and manufacturing a dielectric block 3, a spacer 1, a cavity 6 and a cover plate according to the size requirements, wherein in the embodiment, the cavity 6 is opened up and down, and the cover plate comprises a bottom plate 7 and a top plate 8;
referring to fig. 3, the method for manufacturing the dielectric block 3 includes: (a) pressing a dielectric block 3 green body with a required shape by adopting a mold, wherein the green body comprises the outline of the dielectric block 3 and some required structural characteristics, the outline of the dielectric block 3 is a cuboid, and the required structure comprises a hole 32 and a chamfer 33, and is specifically arranged as required; (b) sintering the green body of the dielectric block 3; (c) finely grinding the sintered dielectric blocks 3; (d) making a pattern 31 corresponding to the coupling window 11 on the finely ground dielectric block 3; specifically, the pattern 31 may be printed directly on the finely ground dielectric block 3 through a steel mesh or a mask, or silver may be baked on the corresponding surface of the finely ground dielectric block 3, and then the pattern 31 corresponding to the coupling window 11 is etched on the silver-baked dielectric block 3 by using laser.
Referring to fig. 2, in the preferred embodiment, the manufacturing method of the spacer 1 is as follows: (a) selecting a section according to the thickness requirement of the spacer 1; (b) stamping the section bar to form a contour outline and a coupling window 11; in this embodiment, the outline of the external shape is square, the coupling windows 11 are arranged according to the coupling requirement, and the coupling windows 11 formed on the spacers 1 may be the same or different; (c) a positioning groove 12 for positioning the dielectric block 3 is processed at the position where the section bar is fixed with the dielectric block 3, and the positioning groove 12 is positioned at the center of the partition sheet 1, so that the dielectric block 3 is conveniently positioned in the center in the assembling process; (d) a trough 13 for placing the solder 2 or silver paste is further processed in the positioning groove 12, the trough 13 is a shallow trough, so that the solder 2 or silver paste can be prevented from overflowing, the coupling window 11 on the spacer 1 and the fixing hole 32 on the dielectric block 3 are prevented from being blocked, and the forming thickness of the solder 2 can be accurately controlled; the trough 13 at least partially exceeds the edge of the dielectric block 3, and the trough 13 exceeds the edge of the dielectric block 3, so that air is conveniently discharged, hollowing between the formed solder 2 or silver paste and the spacer 1 is reduced, and the connection quality is improved; (e) and electroplating a metal layer on the surface of the processed profile.
In other embodiments, the spacer 1 may be further processed with only the positioning groove 12 without the material groove 13, and the spacer 1 is fixed after a solder paste or a silver paste is printed on a corresponding position on the dielectric block 3 by using a steel mesh or a mask according to requirements; or only a material groove 13 is processed on the spacer 1, the positioning groove 12 is not processed, and the medium block 3 and the spacer 1 can be positioned through a clamp; of course, neither the positioning groove 12 nor the trough 13 can be machined on the spacer 1; therefore, the manufacturing of the spacer can be completed only by stamping the section bar and electroplating the metal layer, so that the processing steps are reduced, the cost is reduced, and the size quantity to be controlled is reduced; the above-mentioned embodiments are all included in the scope of protection of the present invention.
(2) Stacking and assembling the dielectric blocks 3 and the spacers 1 in a crossed arrangement order, and mutually fixing the dielectric blocks and the spacers by adopting a welding or sintering mode to form a dielectric block splicing piece 5;
in this embodiment, each dielectric block 3 and corresponding spacer 1 are assembled first to form a plurality of dielectric block assemblies 4, and then the plurality of dielectric block assemblies 4 are stacked and assembled together in sequence, in this embodiment, each dielectric block assembly 4 includes one dielectric block 3 and one spacer 1, and since the number of the spacers 1 is one more than that of the dielectric blocks 3, one spacer 1 needs to be assembled on the surface of the dielectric block 3 on the outermost side, and a dielectric block splicing member 5 is formed after the assembly is completed.
In other embodiments, the dielectric blocks 3 and the spacers 1 may be sequentially assembled, that is, a spacer 1 and a dielectric block 3 are first assembled, then a spacer 1 is assembled, then a dielectric block 3 is assembled, and so on until the assembly is completed to form the dielectric block splicing member 5.
In the preferred embodiment, the dielectric block 3 and the spacer 1 are fixed as follows: in the process of assembling each dielectric block 3 and the spacer 1, placing or injecting the solder 2 into a trough 13 of the spacer 1, if the welding mode is adopted, placing the solder 2 into/or injecting the trough 13, and if the sintering mode is adopted, injecting the silver paste into the trough 13; putting the dielectric block 3 into the positioning groove 12 to be in good contact with the solder 2 or silver paste; after all the dielectric blocks 3 and the spacers 1 are assembled, the jig is used for tightly pressing the dielectric blocks 3 and the spacers 1 and then putting the pressed dielectric blocks 3 and the spacers 1 into a high-temperature furnace for welding or sintering, and the dielectric block splicing piece 5 is fixed completely.
In other embodiments, neither the positioning groove 12 nor the trough 13 is formed on the spacer 1, and the medium block 3 is fixed to the spacer 1 in the following manner: in the process of assembling each dielectric block 3 and the spacer 1, according to needs, a steel mesh or a mask is applied to print tin paste or silver paste on the contact surface of one of the two contact surfaces of the fixed dielectric block 3 and the fixed spacer 1, if a welding mode is adopted, the tin paste is printed on the corresponding position on the dielectric block 3 or the spacer 1, and if a sintering mode is adopted, the silver paste is printed on the corresponding position on the dielectric block 3 or the spacer 1; placing the medium block 3 on the corresponding position of the spacer 1, and performing center positioning through a jig; after all the dielectric blocks 3 and the spacers 1 are assembled, the jig is used for pressing the dielectric blocks 3 and the spacers 1 and then placing the pressed dielectric blocks into a high-temperature furnace for welding or sintering, and the dielectric block splicing piece 5 is fixed. Or, in the manufacturing process of the dielectric block 3, when the pattern 31 corresponding to the coupling window 11 is manufactured on the dielectric block, silver paste is directly brushed on the corresponding position on the dielectric block 3, after all the dielectric blocks 3 and the spacers 1 are assembled, the dielectric blocks 3 and the spacers 1 are pressed tightly by a jig and then placed into a high-temperature furnace for sintering, and the dielectric block splicing piece 5 is fixed completely. In this way, the spacer 1 can be manufactured by only stamping the profile and electroplating the metal layer, thereby reducing the number of processing steps and reducing the cost.
(3) Placing the fixed dielectric block splicing piece 5 into the cavity 6, and enabling the spacer 1 to be in contact with and fixed on the inner wall of the cavity 6;
in this embodiment, the inner wall of the cavity 6 has a locking groove 61 corresponding to each spacer 1, and each spacer 1 is locked in the corresponding locking groove 61 and fixed by welding.
(4) A cover plate is arranged at the opening of the cavity 6 to seal the cavity;
in this embodiment, the cavity 6 has an upper opening and a lower opening, and a top plate 8 and a bottom plate 7 are respectively installed at the upper opening and the lower opening of the cavity 6 to respectively seal the upper opening and the lower opening. The bottom plate 7 is provided with a resonant rod 71 installed in the cavity, the top plate is provided with a tuning screw rod hole 81 corresponding to the resonant rod 71, the frequency is tuned by the depth of the screw penetrating through the tuning screw rod hole 81, and the screw after debugging is fixed through a nut.
The cavities 6 corresponding to the dielectric blocks 3 are of an integrated structure, and the structure is convenient to manufacture and install relative to the structure that each dielectric block 3 corresponds to one cavity.
Preferably, the step (4) is further followed by: a tuning screw and a coupling screw are installed. The frequency or coupling fine adjustment of the dielectric filter is conveniently carried out by installing the tuning screw and the coupling screw, so that the problem of poor electrical performance of a product caused by machining tolerance can be corrected very conveniently. Greatly reducing the processing difficulty.
Example 2:
as shown in fig. 4, another method for manufacturing a dielectric filter according to an embodiment of the present invention is different from the method for manufacturing a dielectric filter according to embodiment 1 of the present invention in that: the cavity 6 is only opened at the upper part, the cover plate only comprises a top plate 8, and in the step (4), the top plate 8 is arranged at the upper opening of the cavity 6 to close the cavity. The resonant rod 71 is separately provided from the cavity 6, and thus it is also necessary to mount the resonant rod 71 to the bottom of the cavity 6.
In the above embodiment, if the second welding method is adopted for fixing, the first welding is performed in the process of forming the dielectric block splicing member by the dielectric block and the spacer, and the welding is performed by using the high-temperature solder with the high melting point, of course, this welding step can also be replaced by using a silver paste sintering method, and the second welding is performed in the process of connecting the dielectric block splicing member and the cavity, and is performed by using the low-temperature solder with the low melting point. Therefore, the welding structure of the previous welding process can be ensured not to be damaged in the process of carrying out the second welding process, and the stability of welding quality is ensured.
In the above embodiments, the input/output connector is connected to the resonance rod by using a tap line.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the manufacturing method of the dielectric filter, the dielectric blocks 3 and the spacers 1 are assembled and fixed to form the dielectric block splicing piece 5, then the whole dielectric block splicing piece 5 is placed into the cavity 6 and sealed and fixed, so that the processes are reduced, the processing time is saved, the cost is saved, the cavity 6 is of an integrated structure, the manufacturing and the installation are convenient, and the performance is stable;
(2) according to the invention, the positioning groove 12 for positioning the medium block 3 is processed on the spacer 1, so that the medium is conveniently centered in the assembling process, the consistency and the accuracy of the product are ensured, and the product performance is stable;
(3) according to the invention, the trough 13 for placing the solder 2 or the silver paste is processed on the spacer 1, so that the solder 2 or the silver paste can be prevented from overflowing, the coupling window 11 of the spacer 1 and the hole 32 of the dielectric block 3 are prevented from being blocked, the forming thickness of the solder 2 can be accurately controlled, and the production consistency and the product reliability are improved; the silo 13 is at least partially surpassed the edge of dielectric block 3, and the silo 13 surpasss the part at dielectric block 3 edge, and the welding in-process exhaust air of being convenient for reduces the hollowing between solder 2 or silver thick liquid and the spacer 1, improves connection quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of making a dielectric filter comprising a plurality of dielectric blocks arranged in a stack, the method comprising the steps of:
(1) obtaining the size requirement according to the frequency and the coupling requirement of the dielectric filter, and manufacturing a dielectric block, a spacer, a cavity and a cover plate according to the size requirement; making a pattern corresponding to the coupling window on the dielectric block;
(2) stacking and assembling the dielectric blocks and the spacers in a crossed arrangement order, and mutually fixing the dielectric blocks and the spacers in a welding or sintering manner to form a dielectric block splicing piece;
(3) placing the fixed dielectric block splicing piece into a cavity, wherein the edge of a spacer extends out of the outer side of the dielectric block, and the spacer is in contact with and fixed on the inner wall of the cavity;
(4) and a cover plate is arranged at the opening of the cavity body to seal the cavity body.
2. The method of claim 1, wherein the dielectric block is fabricated in step (1) as follows:
(a) pressing a dielectric block green body with a required shape by adopting a mould;
(b) sintering the dielectric block green body;
(c) finely grinding the sintered dielectric blocks;
(d) and manufacturing a pattern corresponding to the coupling window on the finely ground dielectric block.
3. The method for manufacturing a dielectric filter according to claim 1, wherein the method for manufacturing the spacer in the step (1) comprises: and processing a positioning groove for positioning the medium block at the position fixed with the medium block on the spacer.
4. The method for manufacturing a dielectric filter according to claim 3, wherein the method for manufacturing the spacer in the step (1) further comprises: and further processing a trough for placing solder or silver paste in the positioning groove, wherein at least part of the trough exceeds the edge of the medium block.
5. The method for manufacturing a dielectric filter according to claim 1, wherein the method for manufacturing the spacer in the step (1) comprises: and processing a trough for placing solder or silver paste at a position fixed with the dielectric block on the spacer, wherein at least part of the trough exceeds the edge of the dielectric block.
6. The method for manufacturing a dielectric filter according to claim 4, wherein the spacer in the step (1) is manufactured by:
(a) selecting a section according to the thickness requirement of the spacer;
(b) stamping the section bar to form a required outline contour and a coupling window;
(c) processing a positioning groove on the section bar;
(d) further processing a trough in the positioning groove;
(e) and electroplating a metal layer on the surface of the processed profile.
7. A method of manufacturing a dielectric filter as claimed in claim 4 or 5, characterized in that: the fixing mode of the medium block and the spacer in the step (2) is as follows: in the process of assembling each dielectric block and each spacer, solder is put into or silver paste is poured into the trough of each spacer, the dielectric blocks are well contacted with the solder or the silver paste, and after the assembly is finished, the dielectric blocks and the spacers are pressed tightly by a jig and then are put into a high-temperature furnace for welding or sintering.
8. A method of making a dielectric filter as recited in claim 1, wherein: and in the step (3), the inner wall of the cavity is provided with clamping grooves corresponding to the spacers, and the spacers are clamped in the corresponding clamping grooves and fixed in a welding mode.
9. The method for manufacturing a dielectric filter according to claim 1, wherein a resonant rod is provided on a cover plate or a cavity of the dielectric filter.
10. The method for manufacturing a dielectric filter according to claim 1, further comprising, after the step (4): a tuning screw and a coupling screw are installed.
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| CN202110325166.0A CN113258245B (en) | 2021-03-26 | 2021-03-26 | Method for manufacturing dielectric filter |
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| CN202110325166.0A CN113258245B (en) | 2021-03-26 | 2021-03-26 | Method for manufacturing dielectric filter |
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| CN113258245A CN113258245A (en) | 2021-08-13 |
| CN113258245B true CN113258245B (en) | 2022-07-08 |
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| CN210379361U (en) * | 2019-10-08 | 2020-04-21 | 深圳顺络电子股份有限公司 | Dielectric filter |
| CN111384505A (en) * | 2018-12-31 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter, method for preparing dielectric filter and communication equipment |
| CN112436250A (en) * | 2020-11-13 | 2021-03-02 | 石家庄市鹿泉区麦特思电子科技有限公司 | Port coupling structure of microwave dielectric waveguide filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9077062B2 (en) * | 2012-03-02 | 2015-07-07 | Lockheed Martin Corporation | System and method for providing an interchangeable dielectric filter within a waveguide |
| US10587030B2 (en) * | 2016-11-08 | 2020-03-10 | LGS Innovations LLC | Systems and methods of designing, tuning and producing ceramic filters |
| US10957960B2 (en) * | 2018-12-14 | 2021-03-23 | Gowrish Basavarajappa | Tunable filter with minimum variations in absolute bandwidth and insertion loss using a single tuning element |
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2021
- 2021-03-26 CN CN202110325166.0A patent/CN113258245B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1319917A (en) * | 2000-03-30 | 2001-10-31 | 株式会社村田制作所 | Dielectric resonator, filter, multiplexer and communication device |
| CN104733820A (en) * | 2015-03-30 | 2015-06-24 | 摩比天线技术（深圳）有限公司 | Ceramic dielectric multi-mode filter and assembly method thereof |
| CN105280565A (en) * | 2015-11-18 | 2016-01-27 | 南京皓赛米电力科技有限公司 | A power module structure capable of improving welding quality |
| CN111384505A (en) * | 2018-12-31 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter, method for preparing dielectric filter and communication equipment |
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