CN209626390U - Quadravalence multilayer cross-coupling ceramic dielectric filter - Google Patents
Quadravalence multilayer cross-coupling ceramic dielectric filter Download PDFInfo
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- CN209626390U CN209626390U CN201920390059.4U CN201920390059U CN209626390U CN 209626390 U CN209626390 U CN 209626390U CN 201920390059 U CN201920390059 U CN 201920390059U CN 209626390 U CN209626390 U CN 209626390U
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- 239000000919 ceramic Substances 0.000 title claims abstract description 42
- 238000006880 cross-coupling reaction Methods 0.000 title claims abstract description 15
- 239000004020 conductor Substances 0.000 claims abstract description 248
- 230000008878 coupling Effects 0.000 claims abstract description 64
- 238000010168 coupling process Methods 0.000 claims abstract description 64
- 238000005859 coupling reaction Methods 0.000 claims abstract description 64
- 239000002184 metal Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 26
- 238000005516 engineering process Methods 0.000 claims description 23
- 238000007639 printing Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of quadravalence multilayer cross-coupling ceramic dielectric filter, including medium block, which is equipped with two rows of four through holes, and the front end face of the medium block forms open surface, rear end face on the other side forms short-circuit face；Open surface is equipped with circuit local conductor layer one, circuit local conductor layer two, circuit local conductor layer three, circuit local conductor layer four, coupling conductors layer and coupling and extends conductor layer；Coupling conductors layer extends between two adjacent circuit local conductor layers；Coupling extends conductor layer connection circuit local conductor layer one and circuit local conductor layer three.The quadravalence multilayer cross-coupling ceramic dielectric filter of the utility model can improve the outer high frequency side rejection characteristic of passband, meet Contiuum type filter and inhibit to require outside the higher band of specific frequency point or special frequency channel；The width that filter finished product can be reduced simultaneously, meets filter in specific use environment to the dual requirement of outer dimension and Out-of-band rejection.
Description
Technical field
The ceramic dielectric filter that the utility model relates to use in the equipment such as wireless mobile communication base station, repeater,
The quadravalence cross-coupling ceramic dielectric filter of high frequency side rejection characteristic outside passband, while energy can be improved more particularly to one kind
Enough reduce the width of filter finished product, meeting filter makes outer dimension and the dual of Out-of-band rejection in specific use environment
With requiring.
Background technique
It is as shown in Figure 1 Contiuum type quadravalence ceramic dielectric filter in the prior art, has by ceramic forming material
Integral type medium block, equidirectional on the medium block to offer four through holes of a row, each through hole constitutes a resonance
Chamber.By silver-plated formation outer conductor layer on the smooth outer surface in four, the upper and lower, left and right of the medium block, in each through hole
Inner surface on pass through silver-plated formation inner conductor layer.The short-circuit face of silver-plated formation, short-circuit face in the back end outer surface of the medium block
Be electrically connected the inner conductor layer in through hole with the outer conductor layer on medium block, the leading exterior surface of medium block as open surface,
Each through hole is corresponded on the open surface and is equipped with circuit local conductor layer, passes through two strip structures on the lower surface of the medium
Insulating regions separate to form signal input terminal and signal output terminal.The quadravalence Contiuum type ceramic dielectric filter is applied
When in the equipment such as base station or repeater, pass through the reception electricity of signal input terminal and signal output terminal and base station, repeater
Road is connected with transmit circuit.
For above-mentioned Contiuum type ceramic dielectric filter, for certain Out-of-band rejection performance and product shape ruler
Very little width requirement does hour as far as possible and is not easy to meet.In the past in order to improve Out-of-band rejection performance, a kind of approach is to increase product
Outer dimension, such as increase filter width, multiple resonant cavities can be designed with this, for improve Out-of-band rejection have very
Good effect.For not only requiring preferable Out-of-band rejection, width also being required to do small feelings as far as possible under some specific use environments
Filter in the prior art cannot be met the requirements under condition.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of quadravalence multilayer cross-coupling ceramic dielectric filter,
The outer high frequency side rejection characteristic of passband can be improved, meet Contiuum type filter outside the higher band of specific frequency point or special frequency channel
Inhibit to require；The width of filter finished product can be reduced simultaneously, meet filter in specific use environment to outer dimension and
The dual requirement of Out-of-band rejection.
In order to solve the above-mentioned technical problem, the utility model provides a kind of quadravalence multilayer cross-coupling ceramic dielectric filter
Wave device offers two rows of four through holes including the integral type medium block by ceramic forming material on the medium block, and described two
Row's through hole is intervally arranged along the thickness direction of medium block, and is located at the axis of the same through hole arranged in parallel, side by side；It is each described
The inner surface of through hole is equipped with the coat of metal and forms inner conductor layer, is equipped in the medium block outer surface for being parallel to perforation axially bored line
The coat of metal forms outer conductor layer；The through hole wherein the medium block outer surface where one end be equipped with the coat of metal form short circuit
Face, the inner conductor layer and outer conductor layer pass through short-circuit face and are conductively connected；Medium block appearance where the through hole other end
Face forms open surface, corresponds to each through hole on the open surface and is respectively equipped with circuit local conductor layer one, circuit local conductor
Layer two, circuit local conductor layer three and circuit local conductor layer four；Each circuit local conductor layer connects with inner conductor layer conduction
It connects；It is formed on one of outer surface of outer conductor layer and is set there are two insulation division on the medium block, described two insulation divisions will
Outer conductor layer of outer surface is separated to form signal input terminal and signal output terminal where it；Coupling is additionally provided on the open surface
It closes conductor layer and coupling extends conductor layer；
The coupling conductors layer and outer conductor layer are conductively connected；The circuit that extends partially into of the coupling conductors layer is locally led
Between body layer one and circuit local conductor layer two, extend partially into circuit local conductor layer two and circuit local conductor layer three it
Between, extend partially between circuit local conductor layer three and circuit local conductor layer four, extend partially into circuit local conductor layer
Between four and circuit local conductor layer one；And the coupling conductors layer and circuit local conductor layer one, circuit local conductor layer two,
There is clearance for insulation between circuit local conductor layer three and circuit local conductor layer four；
The coupling, which extends, has clearance for insulation between conductor layer and outer conductor layer；The coupling extends conductor layer connection electricity
Road bureau's portion's conductor layer one and circuit local conductor layer three, and the coupling extends conductor layer and circuit local conductor layer two and circuit
There is clearance for insulation between local conductor layer four；Or the coupling extends conductor layer connection circuit local conductor layer two and circuit
Local conductor layer four；And have between the coupling extension conductor layer and circuit local conductor layer one and circuit local conductor layer three
Clearance for insulation.
It further comprise being additionally provided with two terminals on the open surface locally to lead in one preferred embodiment of the utility model
Body layer, described two terminal local conductor layers and circuit local conductor layer one, circuit local conductor layer two, circuit local conductor layer
Three, circuit local conductor layer four, coupling conductors layer, coupling, which extend, all has clearance for insulation between conductor layer；Two terminal parts
Conductor layer is connect with signal input terminal and signal output terminal respectively.
It further comprise the cuboid knot that the medium block is accumbency placement in one preferred embodiment of the utility model
Structure, the two rows through hole horizontal cross are arranged on the medium block of rectangular parallelepiped structure.
In one preferred embodiment of the utility model, further comprise each circuit local conductor layer be based on printing
The metal conductor layer that technique or laser technology are formed；It is based on printing technology or laser technology that the coupling, which extends conductor layer,
The metal conductor layer of formation.
In one preferred embodiment of the utility model, further comprise the coupling conductors layer be based on printing technology or
The metal conductor layer that laser technology is formed.
It further comprise the terminal local conductor layer for based on printing technology in one preferred embodiment of the utility model
Or the metal conductor layer that laser technology is formed.
The utility model has the beneficial effects that
The quadravalence ceramic dielectric filter of one, the utility model, the coupling designed on medium block open surface are prolonged
Stretch conductor layer electric signal conducting connection circuit local conductor layer one and circuit local conductor layer three or electric signal conducting connection electricity
Road bureau's portion's conductor layer two and circuit local conductor layer four, the coupling extend conductor layer and form equivalent inductance, locally lead with circuit
Body layer one, circuit local conductor layer two, circuit local conductor layer three, circuit local conductor layer four and coupling conductors layer cooperatively form
High frequency side of the filter circuit outside passband generate two zero points, passband is located to improve quadravalence ceramic dielectric filter with this
The rejection characteristic of outer high frequency side；Meanwhile width or/and development length by changing coupling extension conductor layer can adjust production
The frequency point position of raw zero point, presses down outside higher band so that quadravalence Contiuum type filter can satisfy in specific frequency point or special frequency channel
System requires.
Secondly, the two rows of settings of four through holes of the application four-step filter point, the one of filter compared to the prior art
Row's four through holes of setting, can reduce the width of filter, can satisfy filter in specific use environment to shape ruler
Very little and Out-of-band rejection dual requirement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of quadravalence ceramic dielectric filter in the prior art；
Fig. 2 is the amplitude-frequency characteristic figure figure of quadravalence ceramic dielectric filter shown in Fig. 1；
Fig. 3 is the structural schematic diagram of quadravalence ceramic dielectric filter in the preferred embodiment in the utility model；
Fig. 4 is the amplitude-frequency characteristic figure of quadravalence ceramic dielectric filter shown in Fig. 3；
Fig. 5 is that the amplitude-frequency of quadravalence ceramic dielectric filter shown in quadravalence ceramic dielectric filter shown in Fig. 1 and Fig. 3 is special
Property comparison diagram；
Fig. 6 is the structural schematic diagram of quadravalence ceramic dielectric filter in the utility model second embodiment；
In the amplitude-versus-frequency curve figure of Fig. 2,4,5, abscissa is frequency (GHz), and ordinate is gain (dB).
Figure label explanation: 2- medium block, 4- through hole, 6- inner conductor layer, 8- outer conductor layer, the short circuit face 10-, 12- are opened
Put face, 14- circuit local conductor layer one, 16- circuit local conductor layer two, 18- circuit local conductor layer three, 19- circuit part
Conductor layer four, 20- insulation division, 22- signal input terminal, 24- signal output terminal, 26- coupling extend conductor layer, 28- coupling
Conductor layer, 30- terminal local conductor layer.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, so that those skilled in the art
The utility model may be better understood and can be practiced, but illustrated embodiment is not as the restriction to the utility model.
Embodiment one
Referring to shown in Fig. 3~4, the present embodiment discloses a kind of quadravalence multilayer cross-coupling ceramic dielectric filter, including
By the integral type medium block 2 of ceramic forming material, which is the rectangular parallelepiped structure that accumbency is placed, and is opened on above-mentioned medium block 2
Equipped with two rows of four through holes 4, two rows of 4 horizontal cross of through hole are arranged on the medium block 2 of rectangular parallelepiped structure, and above-mentioned two rows are passed through
Through-hole 4 is intervally arranged along the thickness direction of medium block 2, and is located at parallel, arranged side by side with the axis of the through hole 4 of row；It is each above-mentioned
The inner surface of through hole 2 is equipped with the coat of metal and forms inner conductor layer 6, in the medium block outer surface for being parallel to 4 axis of through hole
Outer conductor layer 8 is formed equipped with the coat of metal；Wherein the medium block outer surface where one end is equipped with coat of metal shape to above-mentioned through hole 4
At short-circuit face 10, above-mentioned inner conductor layer 6 and outer conductor layer 8 pass through short-circuit face 10 and are conductively connected；Where above-mentioned 4 other end of through hole
Medium block outer surface formed open surface 12；One of outer surface that outer conductor layer is formed on above-mentioned medium block 2 is equipped with two
A insulation division 20, above-mentioned two insulation division 20 separate the outer conductor layer of outer surface where it to form signal input terminal 22 and letter
Number output terminal 24.The quadravalence Contiuum type ceramic dielectric filter is applied when in the equipment such as base station or repeater, is passed through
Signal input terminal 22 and signal output terminal 24 are connect with base station, the reception circuit of repeater and transmit circuit.
Each through hole is corresponded on above-mentioned open surface 12 is respectively equipped with circuit local conductor layer 1, circuit local conductor layer
2 16, circuit local conductor layer 3 18 and circuit local conductor layer 4 19；Above-mentioned open surface 12 is additionally provided with coupling and extends conductor layer
26, coupling conductors layer 28 and two terminal local conductor layers 30.More than, the connection relationship on open surface 12 between each conductor layer
It is as follows:
(1) circuit local conductor layer 1, circuit local conductor layer 2 16, circuit local conductor layer 3 18 and circuit part
Conductor layer 4 19 is connect with inner conductor layer 6, and has clearance for insulation between outer conductor layer 8；Each circuit local conductor
Also there is clearance for insulation between layer.
(2) two terminal local conductor layers 30 and circuit local conductor layer 1, circuit local conductor layer 2 16, circuit office
Portion's conductor layer 3 18, circuit local conductor layer 4 19, coupling conductors layer 28, coupling, which extend, to be all had between conductor layer 26 between insulation
Gap；Two terminal local conductor layers 30 connect 24 with signal input terminal 22 and signal output terminal respectively.
(3) coupling conductors layer 28 and outer conductor layer 8 are conductively connected；Above-mentioned coupling conductors layer 28 extends partially into circuit office
Between portion's conductor layer 1 and circuit local conductor layer 2 16, extend partially into circuit local conductor layer 2 16 and circuit is locally led
Between body layer 3 18, extends partially between circuit local conductor layer 3 18 and circuit local conductor layer 4 19, extends partially into
Between circuit local conductor layer 4 19 and circuit local conductor layer 1；And above-mentioned coupling conductors layer 28 and circuit local conductor layer
One 14, have between circuit local conductor layer 2 16, circuit local conductor layer 3 18 and circuit local conductor layer 4 19 between insulation
Gap.
(4) coupling, which extends, has clearance for insulation between conductor layer 26 and outer conductor layer 8；Above-mentioned coupling extends conductor layer 26 and connects
Circuit local conductor layer 1 and circuit local conductor layer 3 18 are connect, and above-mentioned coupling extends conductor layer 26 and circuit local conductor
There is clearance for insulation between layer 2 16 and circuit local conductor layer 4 19.
(5) the 12 top shadow region of open surface of medium block shown in Fig. 3 is conductive layer, and non-hatched area is between insulation
Gap.Certainly, according to actual design requirement, for example, centre frequency, passband width, coupling size etc., on adjustable open surface
The area of the area of each conductive layer, clearance for insulation, i.e. adjustment shadow region area and non-hatched area area.
Related content in above-mentioned quadravalence ceramic dielectric filter technical solution is explained as follows:
1, above-mentioned terminal local conductor layer 30 and each circuit local conductor layer are based on printing technology or laser work
The coat of metal (or metal conductor layer) that skill is formed；It is based on printing technology or laser work that above-mentioned coupling, which extends conductor layer 26,
The coat of metal (or metal conductor layer) that skill is formed；Above-mentioned coupling conductors layer 28 is based on printing technology or laser technology shape
At the coat of metal (or metal conductor layer).Specifically, obtaining terminal local conductor layer based on printing technology, circuit is locally led
Body layer, coupling extend the process of conductor layer or coupling conductors layer are as follows: with through hole, inner conductor layer, outer conductor layer and short
On the medium block on road surface, its coat of metal being located on open surface is removed, is based on printing technology for terminal local conductor layer, circuit
Local conductor layer, coupling extend in conductor layer 26 and the printing to the open surface for having been removed the coat of metal of coupling conductors layer 28, obtain
Obtain quadravalence ceramic dielectric filter.Circuit local conductor layer is obtained based on laser technology, coupling extends conductor layer or coupling
The process of conductor layer are as follows: being integrally formed tool, there are four the medium blocks of through hole, are based on coat of metal technique shape on the medium block
At inner conductor layer, outer conductor layer, short-circuit face and with the open surface of the coat of metal, the open surface of medium block is all covered at this time
The coat of metal identical with short-circuit face forms each terminal part based on the part metals coating on laser technology removal open surface
Conductor layer, circuit local conductor layer, coupling extend conductor layer and extend conductor layer.
2, the above-mentioned coat of metal silver-plated, gold-plated, copper facing or can aluminize, wherein and silver-plated and copper facing is easier to implement, and
The performance of manufactured filter is more preferable.
3, the quadravalence ceramic dielectric filter of the application, compared with the ceramic dielectric filter of the prior art, each
Four through holes are opened up from medium block, form four resonant cavities.The two rows of settings of four through holes of filter of the application point,
Four through holes are arranged in a row of filter compared to the prior art, reduce the width of filter, can satisfy filter in spy
Determine the requirement in use environment to outer dimension.
4, the coupling designed on medium block open surface extends 26 electric signal of conductor layer conducting connection circuit local conductor
Layer 1 and circuit local conductor layer 3 18, which extends conductor layer 26 and forms equivalent inductance, with circuit local conductor layer
One 14, circuit local conductor layer 2 16, circuit local conductor layer 3 18, circuit local conductor layer 4 19 and coupling conductors layer 28 are matched
It closes high frequency side of the filter circuit outside passband formed and generates two zero points, quadravalence ceramic dielectric filter position is improved with this
In the rejection characteristic of lower frequency side outside passband and high frequency side.
Specifically, as shown in figure 4, three rank ceramic dielectric filters of the application design are applied in 800MHz ± 40MHz
In the third-order filter of (centre frequency 800MHz, frequency bandwidth 80MHz), generate zero point frequency point be 950MHz and
Rejection characteristic at 1000MHz, 950MHz is -72.94dB, and the rejection characteristic at 1000MHz is -83.26dB.
As shown in Fig. 2, three rank ceramic dielectric filters of prior art design apply three ranks in 800MHz ± 40MHz
On filter, it is -32.80dB that frequency point, which is rejection characteristic at 950MHz, the rejection characteristic at the place frequency point 1000MHz for -
45.97dB。
Comparison diagram 2 and Fig. 4, or as shown in figure 5, the quadravalence ceramic dielectric filter of the application design is located at
The quadravalence ceramic dielectric filter of the rejection characteristic of 840MHz~1000MHz frequency range compared to the prior art has very big
It is promoted, especially frequency point is located at 950MHz and 1000MHz, and the promotion of Out-of-band rejection characteristic becomes apparent from.Certainly, according to actual use need
It asks, the frequency point position for generating zero point can be adjusted by the width or/and development length that change coupling extension conductor layer 26, is made
It obtains quadravalence Contiuum type filter and can satisfy in specific frequency point or special frequency channel and inhibit to require outside higher band.
Embodiment two
Referring to shown in Fig. 6, the present embodiment discloses a kind of quadravalence multilayer cross-coupling ceramic dielectric filter, with embodiment
One difference is only that coupling extends the extended position of conductor layer, and in the present embodiment, above-mentioned coupling extends conductor layer 26 and connects electricity
Road bureau's portion's conductor layer 2 16 and circuit local conductor layer 4 19；And above-mentioned coupling extends conductor layer 26 and circuit local conductor layer one
There is clearance for insulation between 14 and circuit local conductor layer 3 18.
More than, the four-step filter in embodiment one and embodiment two can generate two zero points in the high frequency side of passband,
The width dimensions of filter finished product can be reduced while improving the rejection characteristic at corresponding frequency point.
Embodiment described above is only preferred embodiments for fully illustrating the utility model, the utility model
Protection scope it is without being limited thereto.Those skilled in the art made equivalent substitute or change on the basis of the utility model
It changes, both is within the protection scope of the present invention.The protection scope of the utility model is subject to claims.
Claims (6)
1. a kind of quadravalence multilayer cross-coupling ceramic dielectric filter, including the integral type medium block by ceramic forming material,
Two rows of four through holes are offered on the medium block, the two rows through hole is intervally arranged along the thickness direction of medium block, and
It is parallel, arranged side by side positioned at the axis of the through hole of same row；The inner surface of each through hole is equipped with the coat of metal and forms interior lead
Body layer is equipped with the coat of metal in the medium block outer surface for being parallel to perforation axially bored line and forms outer conductor layer；The through hole is wherein
Medium block outer surface where one end is equipped with the coat of metal and forms short-circuit face, and the inner conductor layer and outer conductor layer pass through short-circuit face
It is conductively connected；Medium block outer surface where the through hole other end forms open surface, and correspondence is each passed through on the open surface
Through-hole is respectively equipped with circuit local conductor layer one, circuit local conductor layer two, circuit local conductor layer three and circuit local conductor
Layer four；Each circuit local conductor layer is conductively connected with inner conductor layer；Wherein the one of outer conductor layer is formed on the medium block
It is set on a outer surface there are two insulation division, the outer conductor layer of outer surface where it is separated that form signal defeated by described two insulation divisions
Enter terminal and signal output terminal；It is characterized by: being additionally provided with coupling conductors layer and coupling extension conductor layer on the open surface；
The coupling conductors layer and outer conductor layer are conductively connected；The coupling conductors layer extends partially into circuit local conductor layer
Between one and circuit local conductor layer two, extend partially between circuit local conductor layer two and circuit local conductor layer three, portion
Divide and extends between circuit local conductor layer three and circuit local conductor layer four, extends partially into circuit local conductor layer four and electricity
Between road bureau's portion's conductor layer one；And the coupling conductors layer and circuit local conductor layer one, circuit local conductor layer two, circuit office
There is clearance for insulation between portion's conductor layer three and circuit local conductor layer four；
The coupling, which extends, has clearance for insulation between conductor layer and outer conductor layer；The coupling extends conductor layer and connects circuit office
Portion's conductor layer one and circuit local conductor layer three, and the coupling extends conductor layer and circuit local conductor layer two and circuit part
There is clearance for insulation between conductor layer four；Or the coupling extends conductor layer connection circuit local conductor layer two and circuit part
Conductor layer four；And there is insulation between the coupling extension conductor layer and circuit local conductor layer one and circuit local conductor layer three
Gap.
2. quadravalence multilayer cross-coupling ceramic dielectric filter as described in claim 1, it is characterised in that: the open surface
On be additionally provided with two terminal local conductor layers, described two terminal local conductor layers and circuit local conductor layer one, circuit part
Conductor layer two, circuit local conductor layer three, circuit local conductor layer four, coupling conductors layer, coupling extend to be had between conductor layer
There is clearance for insulation；Two terminal local conductor layers are connect with signal input terminal and signal output terminal respectively.
3. quadravalence multilayer cross-coupling ceramic dielectric filter as described in claim 1, it is characterised in that: the medium block
For the rectangular parallelepiped structure that accumbency is placed, the two rows through hole horizontal cross is arranged on the medium block of rectangular parallelepiped structure.
4. quadravalence multilayer cross-coupling ceramic dielectric filter as described in claim 1, it is characterised in that: each circuit
Local conductor layer is the metal conductor layer formed based on printing technology or laser technology；It is base that the coupling, which extends conductor layer,
In the metal conductor layer that printing technology or laser technology are formed.
5. quadravalence multilayer cross-coupling ceramic dielectric filter as described in claim 1, it is characterised in that: the coupling is led
Body layer is the metal conductor layer formed based on printing technology or laser technology.
6. quadravalence multilayer cross-coupling ceramic dielectric filter as claimed in claim 2, it is characterised in that: the terminal office
Portion's conductor layer is the metal conductor layer formed based on printing technology or laser technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920390059.4U CN209626390U (en) | 2019-03-26 | 2019-03-26 | Quadravalence multilayer cross-coupling ceramic dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920390059.4U CN209626390U (en) | 2019-03-26 | 2019-03-26 | Quadravalence multilayer cross-coupling ceramic dielectric filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209626390U true CN209626390U (en) | 2019-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920390059.4U Expired - Fee Related CN209626390U (en) | 2019-03-26 | 2019-03-26 | Quadravalence multilayer cross-coupling ceramic dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209626390U (en) |
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2019
- 2019-03-26 CN CN201920390059.4U patent/CN209626390U/en not_active Expired - Fee Related
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Granted publication date: 20191112 |