CN110380164A - Ceramic dielectric waveguide filter - Google Patents
Ceramic dielectric waveguide filter Download PDFInfo
- Publication number
- CN110380164A CN110380164A CN201910625084.0A CN201910625084A CN110380164A CN 110380164 A CN110380164 A CN 110380164A CN 201910625084 A CN201910625084 A CN 201910625084A CN 110380164 A CN110380164 A CN 110380164A
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- Prior art keywords
- blind hole
- ceramic
- dielectric waveguide
- resonator
- waveguide filter
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- 239000000919 ceramic Substances 0.000 title claims abstract description 109
- 229910010293 ceramic material Inorganic materials 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910052573 porcelain Inorganic materials 0.000 claims 2
- 238000013461 design Methods 0.000 abstract description 13
- 238000007747 plating Methods 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention is suitable for filter field, provide a kind of ceramic dielectric waveguide filter, including at least one ceramic resonator, surface offers downwards the first opening up blind hole to the ceramic resonator on it, and downward opening second blind hole is offered upwardly in its following table, first blind hole and second blind hole are oppositely arranged, and first blind hole and second blind hole are used to frequency tuning.The present invention lift portion can make it away from working frequency, adjacent to the frequency of higher mode under the premise of the operating mode frequency of holding ceramic resonator is constant to improve the distal end rejection of filter.In addition, ceramic resonator provided by the invention the first blind hole can also be reduced under same design size and working frequency needed for depth, so that ceramic resonator is more readily processed molding, plating and later period debugging efforts.
Description
Technical field
The invention belongs to the radio frequencies and microwave filter field more particularly to a kind of ceramic dielectric wave in wireless communication field
Waveguide filter.
Background technique
Ceramic dielectric waveguide filter be it is a kind of use particular ceramic material for carrier, by multiple ceramic resonator cascaded series
At frequency-selective devices.With the rapid development of wireless communication technique, the performance and volume of communication base station equipment are wanted in market
Ask more stringent.Ceramic dielectric waveguide filter with its compact volume and relatively high quality factor have in the future it is wide
Application prospect.Since the high-order mode resonance frequency of ceramic resonator is closer away from basic mode, ceramic dielectric waveguide filter often exists
It is not so good as traditional metal coupling coaxial cavity filter on far-end harmonic rejection, if additional cascaded low-pass filter improves distal end
Harmonic wave can then sacrifice the key indexes such as pass band insertion loss and product size.How the distal end of ceramic dielectric waveguide filter is promoted
Rejection is always the difficult point in ceramic filter design.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of ceramic dielectric waveguide filter is provided,
Lift portion makes it away from work adjacent to the frequency of higher mode under the premise of it is intended to keep the operating mode frequency of resonator constant
Make frequency range.
The present invention is implemented as follows:
A kind of ceramic dielectric waveguide filter, the ceramic dielectric waveguide filter include at least one ceramic resonator,
Surface offers downwards the first opening up blind hole to the ceramic resonator on it, and offers out upwardly in its following table
Second blind hole of mouth down, first blind hole and second blind hole are oppositely arranged, first blind hole and described second blind
Hole is used to frequency tuning.
Further, first blind hole and the second blind hole hole depth ratio are [0.6,1].
Further, first blind hole is identical with the second blind hole hole depth.
Further, the hole wall of first blind hole and second blind hole is all covered with conductive coating.
Further, the ceramic resonator outer surface is covered with conductive coating.
Further, the conductive coating is silver or copper.
Further, the ceramic resonator is rectangle, and first blind hole is located at the ceramic resonator upper surface
Center.
Further, first blind hole and second blind hole cross section are that round and diameter is identical.
Further, the ceramic resonator has multiple and is sequentially connected with, and the ceramic dielectric waveguide filter further includes
Connecting bridge for the two neighboring ceramic resonator that is of coupled connections.
Further, the connecting bridge is made of ceramic material same as the ceramic resonator.
The present invention can keep ceramic resonator operating mode frequency it is constant under the premise of lift portion adjacent to high order
The frequency of mould, makes it away from working frequency, to improve the distal end rejection of filter.In addition, ceramics provided by the invention are humorous
Depth needed for vibration device can also reduce the first blind hole under same design size and working frequency makes ceramic resonator be easier to add
Work molding, plating and later period debugging efforts.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the diagrammatic cross-section of existing ceramic resonator；
Fig. 2 is the diagrammatic cross-section of the ceramic resonator of the embodiment of the present invention；
Fig. 3 is the top view using the ceramic dielectric waveguide filter of traditional ceramics resonator；
Fig. 4 is the bottom view of Fig. 3；
Fig. 5 is the frequency response curve using the ceramic dielectric waveguide filter of Fig. 3 structure；
Fig. 6 is the top view of the ceramic dielectric waveguide filter of the present embodiment；
Fig. 7 is the bottom view of Fig. 6；
Fig. 8 is the frequency response curve using the ceramic dielectric waveguide filter of Fig. 6 structure；
Fig. 9 is the feature comparison figure that Fig. 3 and the ceramic dielectric waveguide filter using Fig. 6 structure is respectively adopted；
Figure 10 is influence curve of the depth ratio to each mode resonance frequency of the second blind hole and the first blind hole.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 10 | Existing resonator | 20 | Ceramic resonator |
| 11 | Single side blind hole | 21 | First blind hole |
| 12 | Port blind hole | 22 | Second blind hole |
| 23 | Port blind hole | ||
| 30 | Connecting bridge |
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or indirectly on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
It should also be noted that, the positional terms such as left and right, upper and lower in the embodiment of the present invention, are only relatively general each other
It reads or be to refer to the normal operating condition of product, and should not be regarded as restrictive.
The present embodiment provides a kind of ceramic dielectric waveguide filter, ceramic dielectric waveguide filter includes at least one ceramics
Resonator, referring to figure 2., surface offers downwards the first opening up blind hole 21 to ceramic resonator 20 on it, and at it
Following table offers downward opening second blind hole 22 upwardly, and the first blind hole 21 and the second blind hole 22 are oppositely arranged, the first blind hole
21 and second blind hole 22 be used to frequency tuning.
Ceramic resonator 20 by sintering and is polished using ceramic material.
Fig. 1 is please referred to, only surface opens up single side blind hole 11 to existing resonator 10 on it, compared to existing resonator 10
Design, this programme can keep ceramic resonator 20 operating mode frequency it is constant under the premise of lift portion adjacent to higher mode
Frequency, working frequency is made it away from, to improve the distal end rejection of filter.
Here by using single side blind hole structure under an identical material and size and using the ceramics of two-sided blind hole structure
It is compared for resonator.The resonator use dielectric constant Er for 20.5 ceramic material, resonator length, width and height size point
Not Wei 10mm, 8.5mm, 5.5mm, each blind hole diameter is 3.4mm.The resonance frequency of resonator basic mode is in 3.5GHz.Fig. 9 is should
Respective eigen mode frequency comparison data both in example, at this time the blind hole depth in existing resonator single side blind hole structure be
2.55mm, and 21 depth H 1 of the first blind hole is 2.03mm in two-sided blind hole structure, 22 depth of the second blind hole is 1.3mm.From figure
It can be seen that the design of double blind pore structure improves the frequency of the 2nd, 3 higher mode TE01 degenerate modes of existing resonator 10 about
500MHz.Although TE11 mode due to blind hole quantity increase and frequency is declined, the frequency phase of itself and neighbouring higher mode
To farther out, and the overall frequency of each higher mode is farther away from working frequency, it is seen then that the ceramic resonator 20 of double blind pore structure on the whole
Facilitate the far-end harmonic rejection of improvement filter.
Referring to figure 3. to 7, explanation is compared by another example.
Fig. 3 and Fig. 4 is that had using the structural schematic diagram of the ceramic dielectric waveguide filter of traditional 11 structure of single side blind hole
Six existing resonators 10, surface offers single side blind hole 11 to each existing resonator 10 on it, under each existing resonator 10
Other than head and the tail filter opens up port blind hole 12, the lower surface of other filters does not open up blind hole on surface.
Fig. 6 and Fig. 7 is using the structural schematic diagram of the ceramic dielectric waveguide filter of the two-sided blind hole structure of this programme, tool
There are six ceramic resonators 20, and surface offers the first blind hole 21 to each ceramic resonator 20 on it, each ceramic resonator 20
Other than head and the tail filter opens up port blind hole 23, other filters offer the second blind hole 22 in its lower surface for lower surface.
Fig. 5 is the frequency response curve using the ceramic dielectric waveguide filter of existing resonator 10 composition, it can be seen that
There are higher harmonic peaks near 6.1GHz and 6.3GHz, and distal end is caused to inhibit.
Fig. 7 is the frequency response curve of the ceramic dielectric waveguide filter of this programme ceramic resonator 20, can be with from figure
Find out, two near 6.3G TE01 mode increased originally, and only a harmonic peaks of remaining TE11 mode stay in the frequency range, peak
Value is also corresponding to be reduced, and the far-end harmonic rejection of entire ceramic dielectric waveguide filter is effectively improved.
In addition, can also to reduce by first under same design size and working frequency blind for the ceramic resonator 20 that provides of this programme
Depth needed for hole 21.Especially when design frequency is relatively low, 11 depth of single side blind hole of existing resonator 10 need compared with
Resonance frequency is reduced deeply, this can give the processes such as machine-shaping of resonator and plating to increase difficulty, also be unfavorable for the life in later period
Produce debugging.This programme can reduce the projected depth of the first blind hole 21, make ceramic resonator 20 be more readily processed molding, plating and
Later period debugging efforts.
Need additional description is that this programme can be situated between using the ceramic resonator 20 of two-sided blind hole structure design in ceramics
It is used alone in matter waveguide filter, or is used with existing 10 Mixed cascading of resonator, form the filter of arbitrary order, according to
Flexible choice is needed to reach optimal performance.
Those skilled in the art can by adjusting the depth of the first blind hole 21 and the second blind hole 22 in each ceramic resonator 20,
The frequency distribution for optimizing respective higher mode under the premise of the operating mode frequency of each ceramic resonator 20 is constant is kept, certain
Further improve the distal end rejection of ceramic dielectric waveguide filter in frequency range.Figure 10 is second in two-sided blind hole structure
Influence of the depth ratio of blind hole 22 and the first blind hole 21 to each mode resonance frequency, by chart it is found that the second blind hole 22 and
Between 0.6-1, far-end harmonic improvement becomes apparent one blind hole, 21 hole depth ratio.It is furthermore preferred that 21 hole depth of the first blind hole is equal to
Second blind hole, 22 depth.The design can improve easy to process while far-end harmonic.Those skilled in the art can also be according to the actual situation
22 hole depth ratio of each resonant cavity the first blind hole 21 and the second blind hole is adjusted flexibly.
In the present embodiment, ceramic resonator 20 is cuboid, and the first blind hole 21 is located at 20 upper surface of ceramic resonator
Center.The design is convenient for positioning and processing, and in other embodiments, the first blind hole 21 can also be located at the other of upper surface
Position does not limit uniquely herein.
First blind hole 21 and 22 cross section of the second blind hole are that round and diameter is identical.Those skilled in the art can also use non-
Prismatic blind hole, or using cross section is rectangular or special-shaped blind hole to adjust resonance performance.It does not limit uniquely herein.
In the present embodiment, the hole wall of 20 outer surface of ceramic resonator, the hole wall of the first blind hole 21 and the second blind hole 22 covers
It is stamped conductive coating.The design can be improved the quality factor (Q value) of ceramic resonator 20, while also play shielding action, reduce
Radiation loss, to reduce the insertion loss of ceramic dielectric waveguide filter.Preferably, conductive coating uses silver or copper product,
The coat of metal is formed using plating.
In the present embodiment, ceramic resonator 20 has multiple and is sequentially connected with, and is in a line after multiple connections of ceramic resonators 20
Arrangement or coiling are arranged in multirow.When being distributed using multirow, ending connection.Ceramic dielectric waveguide filter further includes for coupling
Connect the connecting bridge 30 of two neighboring ceramic resonator 20.Connecting bridge 30 is of coupled connections with two neighboring ceramic resonator 20, shape
At the energy coupling between each ceramic resonator 20, to realize the frequency selective characteristic of filter.
Connecting bridge 30 is made with ceramic resonator 20 of same ceramic material, and the width by changing connecting bridge 30 can
To adjust the coupling amount size between each ceramic resonator 20.It should be noted that for the width dimensions of connecting bridge 30, neighbouring two
The coupling amount of the more existing resonator 10 of a ceramic resonator 20 is bigger, that is to say, that when the design coupling amount between resonator is certain
When, this programme is slightly narrow when relatively being designed using existing resonator 10 for the demand of 30 width of connecting bridge.This, which also contributes to being promoted, comes
From in the harmonic frequency of connecting bridge 30, thus the distal end rejection of service hoisting ceramic dielectric waveguide filter.
Connecting bridge 30 and ceramic resonator 20 are made using same ceramic material so that each ceramic resonator 20 and Ge Lian
Connecing bridge 30 can be process with monolithic ceramic material, to improve the tightness that each ceramic resonator 20 connects.Such as Fig. 5 and figure
Six chamber ceramic dielectric waveguide filter shown in 6 is processed in intermediate region by entire ceramic material and forms point with bifurcated
Slot is cut, it is in multiple ceramic resonators 20 and multiple connecting bridges 30 that slot segmentation, which divides entire ceramic material, in each ceramic resonance
20 upper surface of device opens up the first blind hole 21, opens up port blind hole 23 for believing in the lower surface of two ceramic resonators 20 of head and the tail
Number input and input, the lower surface of other ceramic resonators 20 other than two ceramic resonators 20 of head and the tail opens up the second blind hole
22, to form the ceramic dielectric waveguide filter with multiple ceramic resonators 20.
30 surface of connecting bridge is covered with conductive coating.Likewise, the design can reduce ceramic dielectric waveguide filter
Insertion loss.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of ceramic dielectric waveguide filter, which is characterized in that the ceramic dielectric waveguide filter includes at least one pottery
Porcelain resonator, surface offers downwards the first opening up blind hole to the ceramic resonator on it, and its following table towards
On offer downward opening second blind hole, first blind hole and second blind hole are oppositely arranged, first blind hole and
Second blind hole is used to frequency tuning.
2. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that first blind hole and described second blind
Hole hole depth ratio is [0.6,1].
3. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that first blind hole and described second blind
Hole hole depth is identical.
4. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that first blind hole and described second blind
The hole wall in hole is all covered with conductive coating.
5. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that the ceramic resonator outer surface covering
There is conductive coating.
6. ceramic dielectric waveguide filter as claimed in claim 2, which is characterized in that the conductive coating is silver or copper.
7. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that the ceramic resonator is rectangle, institute
State the center that the first blind hole is located at the ceramic resonator upper surface.
8. ceramic dielectric waveguide filter as described in claim 1, which is characterized in that first blind hole and described second blind
Hole cross section is that round and diameter is identical.
9. ceramic dielectric waveguide filter as described in any of the claims 1 to 8, which is characterized in that the ceramic resonator has
Multiple and be sequentially connected with, the ceramic dielectric waveguide filter further includes for the two neighboring ceramic resonator that is of coupled connections
Connecting bridge.
10. ceramic dielectric waveguide filter as claimed in claim 7, which is characterized in that the connecting bridge uses and the pottery
The same ceramic material of porcelain resonator is made.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910625084.0A CN110380164B (en) | 2019-07-11 | 2019-07-11 | Ceramic dielectric waveguide filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910625084.0A CN110380164B (en) | 2019-07-11 | 2019-07-11 | Ceramic dielectric waveguide filter |
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| Publication Number | Publication Date |
|---|---|
| CN110380164A true CN110380164A (en) | 2019-10-25 |
| CN110380164B CN110380164B (en) | 2024-05-17 |
Family
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| CN201910625084.0A Active CN110380164B (en) | 2019-07-11 | 2019-07-11 | Ceramic dielectric waveguide filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342181A (en) * | 2019-12-23 | 2020-06-26 | 瑞声科技(新加坡)有限公司 | Dielectric waveguide filter |
| CN111370825A (en) * | 2020-04-03 | 2020-07-03 | 南京理工大学 | Balun filter based on ceramic dielectric resonator |
| CN111446526A (en) * | 2020-03-27 | 2020-07-24 | 广东国华新材料科技股份有限公司 | Dielectric filter |
| CN112787054A (en) * | 2021-01-07 | 2021-05-11 | 苏州市协诚微波技术有限公司 | Low-loss ceramic dielectric filter |
| WO2021127933A1 (en) * | 2019-12-23 | 2021-07-01 | 瑞声声学科技(深圳)有限公司 | Dielectric waveguide filter |
| WO2021127931A1 (en) * | 2019-12-23 | 2021-07-01 | 瑞声声学科技(深圳)有限公司 | Ceramic dielectric filter |
| CN113690560A (en) * | 2020-05-18 | 2021-11-23 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| CN114161553A (en) * | 2020-12-21 | 2022-03-11 | 辽宁英冠高技术陶瓷股份有限公司 | Inverted T-shaped blind hole ceramic dielectric filter and special die thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342181A (en) * | 2019-12-23 | 2020-06-26 | 瑞声科技(新加坡)有限公司 | Dielectric waveguide filter |
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| CN113690560A (en) * | 2020-05-18 | 2021-11-23 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| CN114161553A (en) * | 2020-12-21 | 2022-03-11 | 辽宁英冠高技术陶瓷股份有限公司 | Inverted T-shaped blind hole ceramic dielectric filter and special die thereof |
| CN114161553B (en) * | 2020-12-21 | 2023-05-23 | 辽宁英冠高技术陶瓷股份有限公司 | Special mould for inverted T-shaped blind hole ceramic dielectric filter |
| CN112787054A (en) * | 2021-01-07 | 2021-05-11 | 苏州市协诚微波技术有限公司 | Low-loss ceramic dielectric filter |
| WO2022148409A1 (en) * | 2021-01-07 | 2022-07-14 | 苏州市协诚微波技术有限公司 | Ceramic filter having multiple composite ceramic material structures with different dielectric constants |
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| CN110380164B (en) | 2024-05-17 |
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