CN114161553A - Inverted T-shaped blind hole ceramic dielectric filter and special die thereof - Google Patents
Inverted T-shaped blind hole ceramic dielectric filter and special die thereof Download PDFInfo
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- CN114161553A CN114161553A CN202011514396.3A CN202011514396A CN114161553A CN 114161553 A CN114161553 A CN 114161553A CN 202011514396 A CN202011514396 A CN 202011514396A CN 114161553 A CN114161553 A CN 114161553A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
- B28B7/164—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes for plates, panels, or similar sheet- or disc-shaped articles
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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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- Manufacturing & Machinery (AREA)
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- Ceramic Engineering (AREA)
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Abstract
A ceramic dielectric filter with reverse T-shaped blind hole and its special mould is composed of ceramic plate body, upper 2 holes under said upper 2 holes, lower holes under said upper 2 holes and with diameter greater than that of upper hole, and reverse T-shaped blind hole formed by upper and lower holes through gel injection moulding, and features high dielectric constant and Qf value, low insertion loss and saving electric energy, the requirements of miniaturization, light weight, low cost and high performance of the ceramic dielectric filter for 5G communication are met.
Description
Technical Field
The invention belongs to the technical field of ceramic dielectric filters, and particularly relates to an inverted T-shaped blind hole ceramic dielectric filter and a special die thereof.
Background
The filter is one of the core devices of the radio frequency unit, and has the functions of eliminating interference clutter, enabling a useful signal to pass through without attenuation as much as possible, and enabling a useless signal to be attenuated as much as possible. With the development of communication systems, especially the requirements of 5G communication on the miniaturization, light weight, low cost and high performance of filters are obvious, because the ceramic dielectric filter adopts the silver plating of the ceramic substrate to form the resonators, and the plurality of resonators and the coupling among the resonators form the filter, the requirements of 5G communication on the smaller and smaller sizes of the filters can be met. An important index of the ceramic dielectric filter is low insertion loss, which is a loss value in the transmission frequency range of the filter and is one of the keys of distortion-free transmission. The Q value of the microwave dielectric material is inversely proportional to the dielectric loss, and the larger the Q value is, the lower the insertion loss of the filter is, and therefore, the Q value of the dielectric ceramic material and the surface metal film is required to be large in order to reduce the insertion loss.
In the prior art, a ceramic filter is manufactured by pressing and molding microwave dielectric ceramic powder, then performing high-temperature sintering, and performing processes such as polishing treatment, metallization, debugging and the like, namely, after molding and high-temperature sintering, fine engraving processing is required at the later stage, and in the prior art, the ceramic dielectric filter is mainly designed in such a way that a through hole or a blind hole is formed in a ceramic block, the through hole or the blind hole is also provided with a round hole, a long hole or a T-shaped hole, but is arranged on the surface of the ceramic block, for example, the invention with the application number of CN201410471457.0 discloses a dielectric resonator with a reverse stepped resonant cavity and a working method thereof, the dielectric resonator comprises a top surface and a bottom surface, at least one through hole is arranged between the top surface and the bottom surface, and the through hole is formed by splicing an upper half through hole and a lower half through hole; the aperture of the upper half through hole is larger than that of the lower half through hole, or the aperture of the lower half through hole is larger than that of the upper half through hole. The dielectric resonator realizes the change of the filtering frequency on the basis of not changing the depth of the through hole, and enlarges the frequency range of the filtering signal. However, as can be seen from the drawings of the specification of the invention, in the invention, the upper half through hole and the lower half through hole are communicated with the top surface and the bottom surface no matter the aperture of the upper half through hole is larger than that of the lower half through hole or the aperture of the lower half through hole is larger than that of the upper half through hole. Utility model with application number CN201921087241.9 offers the first blind hole that the opening faced upwards at ceramic resonator upper surface downwards to upwards offer the second blind hole that the opening faced downwards at its lower surface, first blind hole with the second blind hole sets up relatively. The invention with the application number of CN202010722569.4 discloses a coupling conversion structure of a dielectric filter, wherein a ceramic dielectric body is provided with a first resonance blind hole, a second resonance blind hole and a coupling blind hole, the second resonance blind hole is a step hole, and the depth of the second resonance blind hole is greater than or equal to that of the coupling blind hole; according to the invention, the resonance frequency of a higher-order mode can be adjusted by adjusting the radius ratio of the step hole and the height difference of the step, so that the attenuation of far-end parasitics is increased, and the out-of-band rejection of the far end of the full-blind hole structure dielectric filter is improved. However, the ceramic filter realizes the functions by printing a circuit on the surface of the ceramic and welding the ceramic filter with a circuit board, the regular T-shaped holes processed on the surface of the ceramic block or a plurality of resonance holes or coupling holes arranged on one surface or a plurality of surfaces of the ceramic block in the prior art occupy the surface area of the ceramic block, and in order to ensure the functions of the ceramic filter, the surface area of the ceramic filter is inevitably increased, the depth of a blind hole is increased, and the thickness of the ceramic filter is increased; the increase in surface area and thickness leads to an increase in the overall volume of the ceramic filter, which is contrary to the requirements for miniaturization and weight reduction of the filter in 5G communication. It is well known that the size of a 5G filter is required to be 50 × 30 × 30mm or less to meet the requirements of an array antenna, and therefore, how to design a filter to increase the surface area of a ceramic filter at the same operating frequency to reduce the overall size of the ceramic filter is a technical problem in the field, and the requirements of the 5G communication on the miniaturization, light weight, low cost and high performance of the filter are met.
Disclosure of Invention
The invention aims to solve the problem that the defects of the prior art are overcome, the inverted T-shaped blind hole ceramic dielectric filter and the special die thereof can meet the requirements of miniaturization and light weight of a 5G filter and the requirement of large Q value of a metal film on the surface of a dielectric ceramic material are provided, and the technical problem of one-step molding of the inverted T-shaped blind hole ceramic dielectric filter is solved by the special die for the inverted T-shaped blind hole ceramic dielectric filter.
The ceramic plate body comprises an upper surface, a lower surface, a front surface, a rear surface, a left surface and a right surface, 2 upper holes are formed in the upper surface of the ceramic plate body downwards, lower holes are formed below the 2 upper holes respectively, the diameters of the lower holes are larger than those of the upper holes, the upper holes are communicated with the lower holes, the lower holes are not communicated with the lower surface, the front surface, the rear surface, the left surface and the right surface of the ceramic plate body, and the upper holes and the lower holes are integrally molded into the inverted T-shaped blind hole through injection and condensation.
The diameter of the upper hole is 3-4 mm, and the diameter of the lower hole is 6-9 mm.
The volume of the inverted T-shaped blind hole ceramic dielectric filter is 33-35 mm multiplied by 16-20 mm multiplied by 7-10 mm.
The invention discloses a special die for an inverted T-shaped blind hole ceramic dielectric filter, which comprises a section die 3, wherein 2 cover plates 2 are arranged on the section die 3, an assembly positioning plate 1 is arranged on the 2 cover plates 2, 2 combined core mounting holes are arranged on the assembly positioning plate 1, the cover plates 2 and the section die 3, positioning pin mounting holes are correspondingly arranged on the assembly positioning plate 1, the cover plates 2 and the section die 3, and positioning pins 5 are arranged on the assembly positioning plate 1, the cover plates 2 and the section die 3, the positioning plate 1, the cover plates 2 and the section die 3 are combined together through the positioning pins 5, 2 combined core mounting holes are correspondingly arranged on the 2 cover plates 2, combined cores 6 are arranged in the 2 corresponding combined core mounting holes of the assembly positioning plate 1 and the cover plates 2, the lower parts of the combined cores 6 extend into a cavity 9 of the section die 3, and a backing plate 4 is arranged below the section die 3.
The combined core 6 comprises a central core 601, 4 first movable cores 602 and 4 second movable cores 603 are respectively arranged around the central core 601, and the first movable cores 602 and the second movable cores 603 are arranged at intervals; the movable core handle cylindrical surface 604, the positioning conical surface 605, the upper hole type core cylindrical surface 606 and the lower hole type core cylindrical surface 607 are sequentially and jointly formed by 4 first movable cores 602 and 4 second movable cores 603 around the central core 601 from top to bottom, the centers of the 4 first movable cores 602 and the 4 second movable cores 603 form a positioning hole which is in contact with a central core positioning column 6012 of the central core 601, and the central core positioning column 6012 of the central core 601 is inserted into the positioning hole and can be pulled out upwards.
The upper end of the central core 601 is a central core handle 6011, and the lower end is a central core positioning column 6012.
The first movable core 602 is provided with a first movable core sector handle 6021, a first movable core sector positioning column 6022, a first movable core upper hole type core 6023 and a first movable core lower hole type core 6024 in sequence from top to bottom.
The second movable core 603 is sequentially provided with a second movable core sector handle 6031, a second movable core sector positioning column 6032, a second movable core upper hole type core 6033 and a second movable core lower hole type core 6034 from top to bottom.
Compared with the prior art, the invention has the beneficial effects that;
(1) the inverted T-shaped blind hole ceramic dielectric filter is formed by integrally pouring and solidifying the upper hole and the lower hole which are formed by the 2 small-diameter upper holes arranged on the upper surface of the ceramic plate body downwards and the lower hole communicated with the 2 small-diameter upper holes but not communicated with the lower surface, the front surface, the rear surface, the left surface and the right surface of the ceramic plate body, and the inverted T-shaped blind hole is formed without carrying out fine engraving processing in the later period, so that the molecular structure of the ceramic is not changed, the dielectric constant and the Qf value are improved, the insertion loss is reduced, and the electric energy is saved.
(2) The invention provides a special die for an inverted T-shaped blind hole ceramic dielectric filter, which is characterized in that a combined core consisting of 4 first movable cores and 4 second movable cores is respectively arranged around a central core, and the first movable cores and the second movable cores are arranged at intervals; the method comprises the steps of forming a movable core handle cylindrical surface, a positioning conical surface, an upper hole type core cylindrical surface and a lower hole type core cylindrical surface by 4 first movable cores and 4 second movable cores around a central core from top to bottom in sequence, forming a positioning hole in contact with a central core positioning column of the central core by the centers of the 4 first movable cores and the 4 second movable cores, inserting the central core positioning column of the central core into the positioning hole and pulling out the central core positioning column upwards, injecting ceramic slurry into a cavity through a pouring gate during use, pulling out the 4 positioning pins after the ceramic slurry is solidified, removing an assembly positioning plate, pulling out the central core of a combined core upwards to make a space for pulling out the first movable core and the second movable core, sequentially pulling out the second movable core and the first movable core, removing 2 cover plates after the combined core is completely pulled out, and then sequentially removing a section mould, the inverted T-shaped blind hole ceramic dielectric filter blank falling on the base plate is taken out and is sintered by turning to the next process, the fact that the diameter of the lower hole is larger than that of the upper hole is achieved, the lower hole is only communicated with the upper hole and is not communicated with the lower surface, the front surface, the rear surface, the left surface and the right surface of the ceramic plate body, particularly, the diameter of the upper hole is only 3-4 mm, the diameter of the lower hole is only 6-9 mm, gel injection molding is conducted on the inverted T-shaped blind hole, the hole profile of the inverted T-shaped blind hole is good, the hole wall is smooth, and a good foundation is provided for sintering and silver plating in the subsequent process.
(3) The invention adopts the structure of the inverted T-shaped blind hole, the volume is less than 50 multiplied by 30mm, and can reach 33-35 multiplied by 16-20 multiplied by 7-10 mm, the surface area of the ceramic filter is increased under the same working frequency, the integral volume of the ceramic filter is reduced, and the requirements of miniaturization, light weight, low cost and high performance of the ceramic dielectric filter by 5G communication are met.
Drawings
FIG. 1 is a front view of an inverted T-shaped blind hole ceramic dielectric filter according to the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural view of a mold for an inverted T-shaped blind-hole ceramic dielectric filter according to the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a cross-sectional view B-B of FIG. 3;
FIG. 6 is a cross-sectional view C-C of FIG. 3;
FIG. 7 is an enlarged view of a portion of FIG. 6 at D;
FIG. 8 is a perspective view of the mold assembly core for the inverted T-shaped blind via ceramic dielectric filter of the present invention;
FIG. 9 is an exploded view of FIG. 8;
FIG. 10 is a perspective view of a central core of the composite core of the present invention;
FIG. 11 is a perspective view of a first removable core of the combination core of the present invention;
fig. 12 is a perspective view of a second movable core of the composite core of the present invention.
In the figure:
1. assembling a positioning plate, 2. a cover plate,
3. a forming die, 301, a transverse template, 302, a longitudinal template,
4. a backing plate, 5. a positioning pin,
6. the core is combined with the core body,
601. center core
6011. A central core handle, 6012, a central core positioning post,
602. a first movable core is arranged on the first movable core,
6021. a first movable core sector handle 6022. a first movable core sector positioning column,
6023. a first movable core upper hole type core 6024. a first movable core lower hole type core,
603 a second movable core for the second movable core,
6031. a second movable core sector handle 6032, a second movable core sector locating post,
6033. a second movable core upper bore core, 6034, a second movable core lower bore core,
604. a cylindrical surface of a handle of the movable core,
605. the conical surface is positioned, and the conical surface,
606. a cylindrical surface of the upper hole-shaped core,
607. a cylindrical surface of the lower hole-shaped core,
7. a pouring gate, 8 exhaust holes, 9 a cavity,
101. the ceramic plate body is provided with a ceramic plate body,
102. the upper surface, 103, the lower surface,
104. the upper hole, 105, the lower hole,
106. the front surface, 107, the back surface,
108. left face, 109 right face.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiment 1
As shown in fig. 1 and 2, the inverted-T type blind via ceramic dielectric filter of the present invention comprises a hexahedral ceramic plate body 101, the ceramic plate body 101 comprises an upper surface 102, a lower surface 103, a front surface 106, a rear surface 107, a left surface 108 and a right surface 109, 2 upper holes 104 are formed downward on the upper surface 102 of the ceramic plate body 101, lower holes 105 are formed below the 2 upper holes 104, and the diameter of the lower hole 105 is larger than that of the upper hole 104, and further, the diameter of the upper hole 104 is 3-4 mm, the diameter of the lower hole 105 is 6-9 mm, the upper hole 104 is communicated with the lower hole 105, the lower hole 105 is not communicated with the lower surface 103, the front surface 106, the rear surface 107, the left surface 108 and the right surface 109 of the ceramic plate body 101, and the upper hole 104 and the lower hole 105 are integrally formed into an inverted T-shaped blind hole in a pouring and solidifying mode, and the cross section of the blind hole is an inverted T-shaped blind groove.
The volume of the inverted T-shaped blind hole ceramic dielectric filter is less than 50 multiplied by 30mm, and can reach 33-35 multiplied by 16-20 multiplied by 7-10 mm.
Detailed description of the preferred embodiment 2
As shown in fig. 3 to 6, the technical solution adopted by the mold for the inverted T-shaped blind hole ceramic dielectric filter of the present invention comprises a mold 3, 2 cover plates 2 are installed on the mold 3, an assembly positioning plate 1 is installed on the 2 cover plates 2, the assembly positioning plate 1 is provided with 4 positioning pin installation holes, 2 combined core installation holes, 1 sprue gate 7 and 4 vent holes 8, the 2 cover plates 2 are correspondingly provided with 4 positioning pin installation holes, 2 combined core installation holes, 1 sprue gate 7 and 4 vent holes 8, wherein the sprue gate 7 on the 2 cover plates 2 is formed by splicing semicircular sprue gates on the front and rear 2 cover plates 2, the mold 3 comprises front and rear 2 transverse templates 301, the front and rear 2 transverse templates 301 are respectively provided with left and right 2 positioning slots and respectively provided with a longitudinal template 302 in the 2 positioning slots, the method comprises the steps that a die 3 is formed by 2 transverse templates 301 and 2 longitudinal templates 302, a cavity 9 is formed between the 2 transverse templates 301 and the 2 longitudinal templates 302, 4 positioning pin mounting holes are correspondingly formed in the 2 transverse templates 301 of the die 3 and correspondingly provided with an assembling positioning plate 1 and a cover plate 2, a combined core 6 is mounted in the 2 corresponding combined core mounting holes of the assembling positioning plate 1 and the cover plate 2, the lower part of the combined core 6 extends into the cavity 9 of the die 3, positioning pins 5 are mounted in the 4 positioning pin mounting holes correspondingly formed in the assembling positioning plate 1, the cover plate 2 and the die 3, the assembling positioning plate 1, the cover plate 2 and the die 3 are combined together through the positioning pins 5, and a backing plate 4 is arranged below the die 3;
as shown in fig. 7 to 12, the combined core 6 includes a central core 601, 4 first movable cores 602 and 4 second movable cores 603 are respectively disposed around the central core 601, and the first movable cores 602 and the second movable cores 603 are arranged at intervals; the upper end of the central core 601 is a central core handle 6011, and the lower end is a central core positioning column 6012; the first movable core 602 is provided with a first movable core sector handle 6021, a first movable core sector positioning column 6022, a first movable core upper hole type core 6023 and a first movable core lower hole type core 6024 in sequence from top to bottom, the second movable core 603 is sequentially provided with a second movable core fan-shaped handle 6031, a second movable core fan-shaped positioning column 6032, a second movable core upper hole type core 6033 and a second movable core lower hole type core 6034 from top to bottom, a movable core handle cylindrical surface 604, a positioning conical surface 605, an upper hole type core cylindrical surface 606 and a lower hole type core cylindrical surface 607 are sequentially formed by 4 first movable cores 602 and 4 second movable cores 603 around the central core 601 from top to bottom, a positioning hole contacted with a central core positioning column 6012 of the central core 601 is formed by the centers of the 4 first movable cores 602 and the 4 second movable cores 603, the center core positioning post 6012 of the center core 601 is inserted into the positioning hole and can be pulled out upward.
When the ceramic filter is used, ceramic slurry is injected into the cavity 9 through the pouring gate 7, after the ceramic slurry is solidified, 4 positioning pins 5 are firstly pulled out, the assembly positioning plate 1 is disassembled, then the central core 601 of the combined core 6 is pulled out upwards to vacate a space for pulling out the first movable core 602 and the second movable core 603, then the second movable core 603 and the first movable core 602 are sequentially pulled out, after the combined core 6 is completely pulled out, 2 cover plates 2 are disassembled, then 2 transverse templates 301 and 2 longitudinal templates 302 are sequentially disassembled, so that an inverted T-shaped blind hole ceramic filter blank falling on the backing plate 4 is taken out, and the next procedure is switched to sintering.
Claims (8)
1. An inverted-T blind-hole ceramic dielectric filter comprising a ceramic plate body (101), the ceramic plate body (101) comprising an upper surface (102), a lower surface (103), a front surface (106), a rear surface (107), a left surface (108), and a right surface (109), 2 upper holes (104) are downwards arranged on the upper surface (102) of the ceramic plate body (101), lower holes (105) are respectively arranged below the 2 upper holes (104), the diameter of the lower hole (105) is larger than that of the upper hole (104), the upper hole (104) is communicated with the lower hole (105), the ceramic plate is characterized in that the lower hole (105) is not communicated with the lower surface (103), the front surface (106), the rear surface (107), the left surface (108) and the right surface (109) of the ceramic plate body (101), and the upper hole (104) and the lower hole (105) are integrally molded into an inverted T-shaped blind hole in an injection-condensation mode.
2. The inverted-T blind hole ceramic dielectric filter according to claim 1, wherein the diameter of the upper hole (104) is 3-4 mm, and the diameter of the lower hole (105) is 6-9 mm.
3. The inverted-T-shaped blind hole ceramic dielectric filter according to claim 2, wherein the volume of the inverted-T-shaped blind hole ceramic dielectric filter is 33-35 mm x 16-20 mm x 7-10 mm.
4. The special mold for the inverted-T-shaped blind hole ceramic dielectric filter according to claim 1, 2 or 3, comprising a mold (3), wherein 2 cover plates (2) are installed on the mold (3), an assembly positioning plate (1) is installed on the 2 cover plates (2), 2 combined core installation holes are arranged on the assembly positioning plate (1), positioning pin installation holes are correspondingly arranged on the assembly positioning plate (1), the cover plate (2) and the mold (3) and provided with positioning pins (5), the positioning plate (1), the cover plate (2) and the mold (3) are combined together by the positioning pins (5), 2 combined core installation holes are correspondingly arranged on the 2 cover plates (2) corresponding to the assembly positioning plate (1), and combined cores (6) are installed in the 2 corresponding combined core installation holes of the assembly positioning plate (1) and the cover plate (2), the lower part of the combined core (6) extends into a cavity (9) of the forming die (3), and a backing plate (4) is arranged below the forming die (3).
5. The special mold for the inverted-T blind-hole ceramic dielectric filter according to claim 4, wherein the combined core (6) comprises a central core (601), 4 first movable cores (602) and 4 second movable cores (603) are respectively arranged around the central core (601), and the first movable cores (602) and the second movable cores (603) are arranged at intervals; a movable core handle cylindrical surface (604), a positioning conical surface (605), an upper hole type core cylindrical surface (606) and a lower hole type core cylindrical surface (607) are sequentially and jointly formed by 4 first movable cores (602) and 4 second movable cores (603) around a central core (601) from top to bottom, positioning holes in contact with a central core positioning column (6012) of the central core (601) are formed in the centers of the 4 first movable cores (602) and the 4 second movable cores (603), and the central core positioning column (601) 2 of the central core (601) is inserted into the positioning holes and can be pulled out upwards.
6. The special mold for the inverted-T blind hole ceramic dielectric filter according to claim 5, wherein the upper end of the central core (601) is a central core handle (6011), and the lower end is a central core positioning column (6012).
7. The special mold for the inverted-T blind hole ceramic dielectric filter according to claim 5, wherein the first movable core (602) is provided with a first movable core fan-shaped handle (6021), a first movable core fan-shaped positioning column (6022), a first movable core upper hole core (6023) and a first movable core lower hole core (6024) in sequence from top to bottom.
8. The special mold for the inverted-T blind hole ceramic dielectric filter according to claim 5, wherein the second movable core (603) is provided with a second movable core sector handle (6031), a second movable core sector positioning post (6032), a second movable core upper hole core (6033) and a second movable core lower hole core (6034) from top to bottom in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011514396.3A CN114161553B (en) | 2020-12-21 | 2020-12-21 | Special mould for inverted T-shaped blind hole ceramic dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011514396.3A CN114161553B (en) | 2020-12-21 | 2020-12-21 | Special mould for inverted T-shaped blind hole ceramic dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114161553A true CN114161553A (en) | 2022-03-11 |
| CN114161553B CN114161553B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011514396.3A Active CN114161553B (en) | 2020-12-21 | 2020-12-21 | Special mould for inverted T-shaped blind hole ceramic dielectric filter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020000505A (en) * | 2000-06-21 | 2002-01-05 | 무라타 야스타카 | Method for press-molding dielectric block |
| CN102601853A (en) * | 2012-04-05 | 2012-07-25 | 刘发清 | Block making machine, molding mould plate easy to demould and variable-thickness plate |
| CN105014776A (en) * | 2015-07-28 | 2015-11-04 | 鲍威 | Bidirectional-expansion core mold |
| CN110380164A (en) * | 2019-07-11 | 2019-10-25 | 摩比科技（深圳）有限公司 | Ceramic dielectric waveguide filter |
| CN111668579A (en) * | 2020-06-01 | 2020-09-15 | 惠州威博精密科技有限公司 | Semi-finished product of 5G communication filter dielectric ceramic part and forming method thereof |
-
2020
- 2020-12-21 CN CN202011514396.3A patent/CN114161553B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020000505A (en) * | 2000-06-21 | 2002-01-05 | 무라타 야스타카 | Method for press-molding dielectric block |
| CN102601853A (en) * | 2012-04-05 | 2012-07-25 | 刘发清 | Block making machine, molding mould plate easy to demould and variable-thickness plate |
| CN105014776A (en) * | 2015-07-28 | 2015-11-04 | 鲍威 | Bidirectional-expansion core mold |
| CN110380164A (en) * | 2019-07-11 | 2019-10-25 | 摩比科技（深圳）有限公司 | Ceramic dielectric waveguide filter |
| CN111668579A (en) * | 2020-06-01 | 2020-09-15 | 惠州威博精密科技有限公司 | Semi-finished product of 5G communication filter dielectric ceramic part and forming method thereof |
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| CN114161553B (en) | 2023-05-23 |
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