CN110380164B - Ceramic dielectric waveguide filter - Google Patents
Ceramic dielectric waveguide filter Download PDFInfo
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- CN110380164B CN110380164B CN201910625084.0A CN201910625084A CN110380164B CN 110380164 B CN110380164 B CN 110380164B CN 201910625084 A CN201910625084 A CN 201910625084A CN 110380164 B CN110380164 B CN 110380164B
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- waveguide filter
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- 239000000919 ceramic Substances 0.000 title claims abstract description 115
- 229910010293 ceramic material Inorganic materials 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 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
- 238000007747 plating Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
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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
-
- 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
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Abstract
The invention is suitable for the field of filters, and provides a ceramic dielectric waveguide filter which comprises at least one ceramic resonator, wherein a first blind hole with an upward opening is formed in the upper surface of the ceramic resonator downwards, a second blind hole with a downward opening is formed in the lower surface of the ceramic resonator upwards, the first blind hole and the second blind hole are oppositely arranged, and the first blind hole and the second blind hole are both used for frequency tuning. According to the invention, the frequency of the part adjacent to the higher order mode can be raised on the premise of keeping the working mode frequency of the ceramic resonator unchanged, so that the part is far away from the working frequency, and the far-end inhibition performance of the filter is improved. In addition, the ceramic resonator provided by the invention can reduce the depth required by the first blind hole under the same design size and working frequency, so that the ceramic resonator is easier to process, mold, plate and debug in later period.
Description
Technical Field
The invention belongs to the field of radio frequency and microwave filters in the field of wireless communication, and particularly relates to a ceramic dielectric waveguide filter.
Background
The ceramic dielectric waveguide filter is a frequency selection device which is formed by cascade connection of a plurality of ceramic resonators by adopting a specific ceramic material as a carrier. With the rapid development of wireless communication technology, the market has increasingly stringent performance and volume requirements for communication base station equipment. Ceramic dielectric waveguide filters have a broad application prospect in the future due to their compact size and relatively high quality factors. Because the higher-order mode resonant frequency of the ceramic resonator is closer to the fundamental mode, the ceramic dielectric waveguide filter is often inferior to the traditional metal coaxial cavity filter in far-end harmonic suppression performance, and if a low-pass filter is additionally cascaded to improve far-end harmonic, key indexes such as passband insertion loss, product size and the like are sacrificed. How to improve the far-end suppression performance of ceramic dielectric waveguide filters has been a difficulty in ceramic filter design.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a ceramic dielectric waveguide filter which aims to improve the frequency of a part adjacent to a higher-order mode to keep the frequency of an operating mode of a resonator unchanged and keep the frequency away from an operating frequency band.
The invention is realized in the following way:
the utility model provides a ceramic dielectric waveguide filter, ceramic dielectric waveguide filter includes at least one ceramic resonator, ceramic resonator has seted up the first blind hole that the opening was up downwards at its upper surface to have seted up the second blind hole that the opening was down upwards at its lower surface, first blind hole with the second blind hole sets up relatively, first blind hole with the second blind hole all is used for the frequency tuning.
Further, the ratio of the depths of the first blind holes to the second blind holes is [0.6,1].
Further, the first blind hole and the second blind hole have the same hole depth.
Further, the hole walls of the first blind hole and the second blind hole are covered with conductive coatings.
Further, the outer surface of the ceramic resonator is covered with a conductive coating.
Further, the conductive coating is silver or copper.
Further, the ceramic resonator is rectangular, and the first blind hole is located at the center of the upper surface of the ceramic resonator.
Further, the cross sections of the first blind holes and the second blind holes are round and have the same diameter.
Further, the ceramic resonators are plural and connected in sequence, and the ceramic dielectric waveguide filter further comprises a connecting bridge for coupling and connecting two adjacent ceramic resonators.
Further, the connecting bridge is made of the same ceramic material as the ceramic resonator.
According to the invention, the frequency of the part adjacent to the higher order mode can be raised on the premise of keeping the working mode frequency of the ceramic resonator unchanged, so that the part is far away from the working frequency, and the far-end inhibition performance of the filter is improved. In addition, the ceramic resonator provided by the invention can reduce the depth required by the first blind hole under the same design size and working frequency, so that the ceramic resonator is easier to process, mold, plate and debug in later period.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a prior art ceramic resonator;
FIG. 2 is a schematic cross-sectional view of a ceramic resonator according to an embodiment of the invention;
FIG. 3 is a top view of a ceramic dielectric waveguide filter employing a conventional ceramic resonator;
FIG. 4 is a bottom view of FIG. 3;
FIG. 5 is a frequency response curve of a ceramic dielectric waveguide filter employing the structure of FIG. 3;
Fig. 6 is a top view of the ceramic dielectric waveguide filter of the present embodiment;
FIG. 7 is a bottom view of FIG. 6;
FIG. 8 is a frequency response curve of a ceramic dielectric waveguide filter employing the structure of FIG. 6;
FIG. 9 is a characteristic comparison of ceramic dielectric waveguide filters employing the structures of FIG. 3 and FIG. 6, respectively;
FIG. 10 is a graph showing the effect of the depth ratio of the second blind via to the first blind via on the resonant frequency of each mode.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Existing resonator | 20 | Ceramic resonator |
| 11 | Single-sided blind hole | 21 | First blind hole |
| 12 | Port blind hole | 22 | Second blind hole |
| 23 | Port blind hole | ||
| 30 | Connecting bridge |
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It should be further noted that terms such as left, right, upper, and lower in the embodiments of the present invention are merely relative concepts or references to normal use states of the product, and should not be construed as limiting.
The present embodiment provides a ceramic dielectric waveguide filter, which includes at least one ceramic resonator, referring to fig. 2, a first blind hole 21 with an upward opening is formed in an upper surface of the ceramic resonator 20, and a second blind hole 22 with a downward opening is formed in a lower surface of the ceramic resonator, where the first blind hole 21 and the second blind hole 22 are disposed opposite to each other, and the first blind hole 21 and the second blind hole 22 are both used for frequency tuning.
The ceramic resonator 20 is formed by sintering and polishing a ceramic material.
Referring to fig. 1, the conventional resonator 10 has a blind hole 11 on its upper surface, which can improve the frequency of the adjacent higher-order mode to keep the frequency of the operating mode of the ceramic resonator 20 unchanged, so as to improve the far-end rejection performance of the filter.
The comparison is made here by taking a ceramic resonator of the same material and dimensions, using a single-sided blind hole structure, and using a double-sided blind hole structure. The resonator adopts ceramic material with dielectric constant Er of 20.5, the length, width and height dimensions of the resonator are 10mm,8.5mm and 5.5mm respectively, and the diameters of all blind holes are 3.4mm. The resonance frequency of the fundamental mode of the resonator is at 3.5GHz. Fig. 9 is the eigenmode frequency contrast data for each of the two examples, where the blind via depth in the prior resonator single-sided blind via structure is 2.55mm, while the first blind via 21 depth H1 in the double-sided blind via structure is 2.03mm and the second blind via 22 depth is 1.3mm. It can be seen from the figure that the design of the double blind hole structure improves the frequency of the 2 nd and 3 rd high order modes TE01 degenerate modes of the existing resonator 10 by about 500MHz. Although the TE11 mode has a frequency drop due to the increased number of blind holes, it is relatively far from the frequency of the adjacent higher order modes, and the overall frequency of each higher order mode is further from the operating frequency, as can be seen, the ceramic resonator 20 of the overall dual blind hole structure helps to improve the far end harmonic rejection performance of the filter.
Please refer to fig. 3 to 7 for a comparative illustration by way of another example.
Fig. 3 and 4 are schematic structural views of a ceramic dielectric waveguide filter adopting a conventional single-sided blind hole 11 structure, and the ceramic dielectric waveguide filter has six existing resonators 10, wherein each existing resonator 10 is provided with a single-sided blind hole 11 on the upper surface thereof, and the lower surfaces of the existing resonators 10 are not provided with blind holes except for the blind holes 12 of the ports of the head-tail filter.
Fig. 6 and 7 are schematic structural diagrams of a ceramic dielectric waveguide filter with a double-sided blind hole structure according to the present embodiment, and each ceramic resonator 20 has a first blind hole 21 formed on its upper surface, and a second blind hole 22 formed on its lower surface except for a blind hole 23 formed on the top and bottom of each ceramic resonator 20.
Fig. 5 is a frequency response curve of a ceramic dielectric waveguide filter using the prior art resonator 10, and it can be seen that higher harmonic peaks exist near 6.1GHz and 6.3GHz, resulting in far-end rejection.
Fig. 7 is a frequency response curve of the ceramic dielectric waveguide filter of the ceramic resonator 20 according to the present embodiment, it can be seen from the figure that two TE01 modes originally near 6.3G are raised, only one harmonic peak of the TE11 mode remains in the frequency band, the peak is correspondingly reduced, and the far-end harmonic suppression performance of the entire ceramic dielectric waveguide filter is effectively improved.
Furthermore, the ceramic resonator 20 provided by the present solution also enables to reduce the depth required for the first blind hole 21 at the same design size and operating frequency. Particularly, when the design frequency is relatively low, the depth of the blind hole 11 on the single side of the existing resonator 10 needs to be deeper to reduce the resonance frequency, which increases the difficulty in the working procedures of forming and electroplating the resonator, and is not beneficial to the subsequent production and debugging. The design depth of the first blind hole 21 can be reduced, so that the ceramic resonator 20 is easier to process and mold, electroplate and debug in later period.
It should be additionally noted that the ceramic resonator 20 adopting the double-sided blind hole structure design in the scheme can be independently used in a ceramic dielectric waveguide filter or used in a mixed cascade with the existing resonator 10 to form a filter of any order, and can be flexibly selected according to the requirement to achieve the optimal performance.
The person skilled in the art can optimize the frequency distribution of the respective higher-order modes by adjusting the depths of the first blind hole 21 and the second blind hole 22 in each ceramic resonator 20 on the premise of keeping the operating mode frequency of each ceramic resonator 20 unchanged, so as to further improve the far-end suppression performance of the ceramic dielectric waveguide filter in a certain frequency range. Fig. 10 shows the effect of the ratio of the depths of the second blind hole 22 and the first blind hole 21 on the resonant frequency of each mode in the double-sided blind hole structure, and it can be seen from the graph that the ratio of the depths of the second blind hole 22 and the first blind hole 21 is between 0.6 and 1, and the improvement of the far-end harmonic wave is more obvious. More preferably, the first blind hole 21 has a hole depth equal to the second blind hole 22. The design can improve the far-end harmonic wave and is convenient to process. The hole depth ratio of the first blind hole 21 and the second blind hole 22 of each resonant cavity can be flexibly adjusted according to practical situations by a person skilled in the art.
In this embodiment, the ceramic resonator 20 has a rectangular parallelepiped shape, and the first blind hole 21 is located at the center of the upper surface of the ceramic resonator 20. This design facilitates positioning and machining, and in other embodiments, the first blind hole 21 may be located at other positions on the upper surface, not limited solely herein.
The first blind hole 21 and the second blind hole 22 are circular in cross section and identical in diameter. It is also possible for the person skilled in the art to use blind holes of non-uniform cross section or blind holes with square or profiled cross section to adjust the resonance properties. And are not limited in this regard.
In this embodiment, the outer surface of the ceramic resonator 20, the hole wall of the first blind hole 21 and the hole wall of the second blind hole 22 are all covered with a conductive coating. The design can improve the quality factor (Q value) of the ceramic resonator 20, and also plays a role of shielding, so that radiation loss is reduced, and the insertion loss of the ceramic dielectric waveguide filter is reduced. Preferably, the conductive coating is silver or copper material, and the metal coating is formed by electroplating.
In this embodiment, the ceramic resonators 20 are plural and connected in sequence, and the plural ceramic resonators 20 are connected and arranged in a row or coiled in a plurality of rows. And when the multi-row distribution is adopted, ending connection is adopted. The ceramic dielectric waveguide filter further comprises a connecting bridge 30 for coupling between adjacent two ceramic resonators 20. The connecting bridge 30 is coupled to two adjacent ceramic resonators 20 to form energy coupling between the ceramic resonators 20, thereby realizing frequency selective characteristics of the filter.
The connecting bridge 30 and the ceramic resonators 20 are made of the same ceramic material, and the coupling amount between the ceramic resonators 20 can be adjusted by changing the width of the connecting bridge 30. It should be noted that, regarding the width dimension of the connecting bridge 30, the coupling amount of the adjacent two ceramic resonators 20 is slightly larger than that of the existing resonator 10, that is, when the designed coupling amount between the resonators is constant, the requirement of the present solution for the width of the connecting bridge 30 is slightly narrower than that of the existing resonator 10. This also helps to boost the harmonic frequencies from the bridge 30, thereby helping to boost the far end rejection performance of the ceramic dielectric waveguide filter.
The connecting bridge 30 is made of the same ceramic material as the ceramic resonators 20 so that each ceramic resonator 20 and each connecting bridge 30 can be processed from a single piece of ceramic material, thereby improving the fastening of the connection of each ceramic resonator 20. As shown in fig. 5 and 6, the six-cavity ceramic dielectric waveguide filter is formed by processing the entire ceramic material in the middle area to form a split groove with a bifurcation, the split groove divides the entire ceramic material into a plurality of ceramic resonators 20 and a plurality of connecting bridges 30, a first blind hole 21 is formed on the upper surface of each ceramic resonator 20, a port blind hole 23 is formed on the lower surfaces of the two ceramic resonators 20 at the front and rear for signal input and output, and a second blind hole 22 is formed on the lower surfaces of the other ceramic resonators 20 except the two ceramic resonators 20 at the front and rear, thereby forming the ceramic dielectric waveguide filter having a plurality of ceramic resonators 20.
The surface of the connection bridge 30 is covered with a conductive plating. Also, the design can reduce the insertion loss of the ceramic dielectric waveguide filter.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a ceramic dielectric waveguide filter, its characterized in that, ceramic dielectric waveguide filter includes a plurality of ceramic resonators, each ceramic resonator has seted up first blind hole that the opening is up downwards at its upper surface, and two end the port blind hole is seted up to ceramic resonator's lower surface, the port blind hole is used for signal input and output, avoid two ceramic resonators of end other ceramic resonator's lower surface has seted up the second blind hole that the opening is down upwards, first blind hole with the second blind hole sets up relatively, first blind hole with the second blind hole all is used for the frequency tuning.
2. The ceramic dielectric waveguide filter of claim 1 wherein the ratio of the first blind via to the second blind via hole depths is between 0.6-1.
3. The ceramic dielectric waveguide filter of claim 1, wherein the first blind via and the second blind via are the same in hole depth.
4. The ceramic dielectric waveguide filter of claim 1 wherein the walls of the first blind via and the second blind via are each covered with a conductive plating.
5. The ceramic dielectric waveguide filter of claim 1 wherein the ceramic resonator outer surface is covered with a conductive coating.
6. The ceramic dielectric waveguide filter of claim 5 wherein the conductive coating is silver or copper.
7. The ceramic dielectric waveguide filter of claim 1 wherein the ceramic resonator is rectangular and the first blind hole is centrally located on an upper surface of the ceramic resonator.
8. The ceramic dielectric waveguide filter of claim 1, wherein the first blind hole and the second blind hole are circular in cross-section and have the same diameter.
9. A ceramic dielectric waveguide filter according to any one of claims 1 to 8, wherein a plurality of said ceramic resonators are connected in series, said ceramic dielectric waveguide filter further comprising a connecting bridge for coupling adjacent two of said ceramic resonators.
10. The ceramic dielectric waveguide filter of claim 9 wherein the connecting bridge is made of the same ceramic material as the ceramic resonator.
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| CN201910625084.0A CN110380164B (en) | 2019-07-11 | 2019-07-11 | Ceramic dielectric waveguide filter |
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| CN201910625084.0A CN110380164B (en) | 2019-07-11 | 2019-07-11 | Ceramic dielectric waveguide filter |
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| CN110380164A CN110380164A (en) | 2019-10-25 |
| CN110380164B true CN110380164B (en) | 2024-05-17 |
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Families Citing this family (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 |
| WO2021127931A1 (en) * | 2019-12-23 | 2021-07-01 | 瑞声声学科技(深圳)有限公司 | 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 |
| CN111446526B (en) * | 2020-03-27 | 2021-11-02 | 广东国华新材料科技股份有限公司 | Dielectric filter |
| CN111370825B (en) * | 2020-04-03 | 2021-03-26 | 南京理工大学 | Balun filter based on ceramic dielectric resonator |
| CN113690560B (en) * | 2020-05-18 | 2023-06-09 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| 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 |
| CN112787054B (en) * | 2021-01-07 | 2022-08-12 | 苏州市协诚微波技术有限公司 | Low-loss ceramic dielectric filter |
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| JPH0878918A (en) * | 1994-08-17 | 1996-03-22 | Dae Young Electron Co Ltd | Dielectric ceramic resonator and filter |
| CN103618122A (en) * | 2013-12-16 | 2014-03-05 | 武汉凡谷电子技术股份有限公司 | Dielectric waveguide filter |
| CN109309272A (en) * | 2018-11-14 | 2019-02-05 | 苏州波发特电子科技有限公司 | A kind of capacitive coupling structure for dielectric filter |
| CN208622916U (en) * | 2018-09-25 | 2019-03-19 | 苏州艾福电子通讯有限公司 | A kind of ceramic dielectric waveguide filter |
| CN109687072A (en) * | 2019-01-11 | 2019-04-26 | 苏州艾福电子通讯有限公司 | Filter |
| CN210200922U (en) * | 2019-07-11 | 2020-03-27 | 摩比科技（深圳）有限公司 | Ceramic dielectric waveguide filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10056664B2 (en) * | 2014-08-18 | 2018-08-21 | Fengxi Huang | Three dimensional tunable filters with an absolute constant bandwidth and method |
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2019
- 2019-07-11 CN CN201910625084.0A patent/CN110380164B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0878918A (en) * | 1994-08-17 | 1996-03-22 | Dae Young Electron Co Ltd | Dielectric ceramic resonator and filter |
| CN103618122A (en) * | 2013-12-16 | 2014-03-05 | 武汉凡谷电子技术股份有限公司 | Dielectric waveguide filter |
| CN208622916U (en) * | 2018-09-25 | 2019-03-19 | 苏州艾福电子通讯有限公司 | A kind of ceramic dielectric waveguide filter |
| CN109309272A (en) * | 2018-11-14 | 2019-02-05 | 苏州波发特电子科技有限公司 | A kind of capacitive coupling structure for dielectric filter |
| CN109687072A (en) * | 2019-01-11 | 2019-04-26 | 苏州艾福电子通讯有限公司 | Filter |
| CN210200922U (en) * | 2019-07-11 | 2020-03-27 | 摩比科技（深圳）有限公司 | Ceramic dielectric waveguide filter |
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