CN112164848A - Topological structure of dielectric filter and dielectric-filled waveguide filter - Google Patents
Topological structure of dielectric filter and dielectric-filled waveguide filter Download PDFInfo
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- CN112164848A CN112164848A CN202010956072.9A CN202010956072A CN112164848A CN 112164848 A CN112164848 A CN 112164848A CN 202010956072 A CN202010956072 A CN 202010956072A CN 112164848 A CN112164848 A CN 112164848A
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- 239000002184 metal Substances 0.000 description 6
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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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- 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
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Abstract
A topological structure of a dielectric filter and a dielectric-filled waveguide filter, wherein the topological structure of the dielectric filter comprises a ceramic medium, the upper surface of the ceramic medium is provided with a plurality of rows of resonant cavities arranged along the length direction, each row is provided with two resonant cavities, the central connecting line of the two resonant cavities in the same row is parallel to the width direction of the ceramic medium, one width side surface of the ceramic medium is provided with an O-shaped blind hole extending along the length direction of the ceramic medium, the diameter of the O-shaped blind hole is greater than 2/3 of the thickness of the ceramic medium, and the two resonant cavities in any row on the upper surface of the ceramic medium are symmetrically arranged relative to the O-shaped blind; two rows of four resonant cavities close to the O-shaped blind holes are enclosed into a rectangle, and the crossing position of two diagonal lines of the rectangle is provided with another O-shaped blind hole; grooves with different shapes are arranged on the upper surface of the ceramic medium so as to realize the coupling between the adjacent resonant cavities; the dielectric filling waveguide filter adopting the topological structure can realize the symmetry of left and right zeros on a frequency response curve of the filter.
Description
Technical Field
The invention belongs to the technical field of filters, relates to a ceramic dielectric filled waveguide filter, and particularly relates to a dielectric filter topological structure and a dielectric filled waveguide filter.
Background
In the 5G era, the requirement of Massive MIMO (Massive antenna technology) on the integration of Massive antennas is limited, the filter needs to be more miniaturized and integrated, and under the condition of limiting the size of the cavity, due to the loss of the material, the metal coaxial cavity filter and the metal cavity dielectric filter cannot obtain a very high Q value, so that various performance indexes are limited.
In order to meet the requirement of the 5G base station filter on miniaturization, a ceramic dielectric filter which is easier to miniaturize becomes a mainstream solution. The electromagnetic wave resonance in the ceramic dielectric filter occurs in the dielectric material, and the traditional metal cavity is replaced by the metal coating, so the volume is smaller, the weight is lighter, and in addition, the ceramic dielectric filter has the advantages of high Q value, good frequency selection characteristic, good working frequency stability, small insertion loss, small high and low temperature drift characteristics and the like.
The electromagnetic principle of the dielectric-filled waveguide filter is the same as that of the traditional metal cavity waveguide filter, and the difference is that the dielectric-filled waveguide filter generally adopts a functional ceramic medium, the traditional metal cavity filter adopts an air medium, and the dielectric constants of the functional ceramic medium and the air are different. The key design technology of the dielectric-filled waveguide filter as a new type of waveguide filter lies in the realization of a topological structure and a transmission zero point.
The structure of the existing ceramic dielectric filled waveguide filter is shown in fig. 1, wherein reference numerals 1, 2, 3, 4, 5, and 6 are first to sixth resonant cavities, reference numerals 7 and 8 are different branches belonging to the same trench, reference numerals 9 and 12 are different branches of the same trench, the coupling size of the first resonant cavity 1 and the second resonant cavity 2 is adjusted by the first trench branch 7, the coupling size of the second resonant cavity 2 and the third resonant cavity 3 is adjusted by the second trench branch 8, the coupling size of the third resonant cavity 3 and the fourth resonant cavity 4 is adjusted by the third trench branch 9, and the coupling size of the third resonant cavity 3 and the sixth resonant cavity 6 is adjusted by the fourth trench branch 12; reference numerals 10 and 11 denote two "O" shaped grooves, respectively, for increasing the coupling amount of the fourth resonant cavity 4 and the fifth resonant cavity 5 and the sixth resonant cavity 6. The frequency is adjusted by adjusting the size and depth of the holes of the six resonators.
In the above structure, a frequency response curve of the coupling between the third resonant cavity 3 and the sixth resonant cavity 6 is shown in fig. 3, the coupling between the third resonant cavity 3 and the sixth resonant cavity 6 realizes two zeros (indicated by arrows), but the left and right zeros are asymmetric, so that the coupling between the third resonant cavity 3 and the fifth resonant cavity 5, and the coupling between the fourth resonant cavity and the sixth resonant cavity (windowing) cannot be realized, and the conventional structure cannot meet the requirement of zero symmetry under the conditions that the near-end rejection of the filter is high and the left and right zeros are asymmetric (as shown in fig. 3).
Disclosure of Invention
The invention aims to provide a topological structure of a dielectric filter, which realizes the symmetry of left and right zeros on a frequency response curve of the filter by optimizing the position and the shape of a groove on the dielectric filter.
In order to achieve the purpose, the invention adopts the technical scheme that: a topological structure of a dielectric filter comprises a cuboid ceramic medium, wherein a plurality of rows of resonant cavities are arranged on the upper surface of the ceramic medium along the length direction of the ceramic medium, each row is provided with two resonant cavities, and the central connecting line of the two resonant cavities on the same row is parallel to the width direction of the ceramic medium, and the topological structure is characterized in that: an O-shaped blind hole extending along the length direction of the ceramic medium is arranged at the center of one width side of the ceramic medium, the diameter of the O-shaped blind hole is greater than 2/3 of the thickness of the ceramic medium, and two resonant cavities in any row on the upper surface of the ceramic medium are symmetrically arranged around the O-shaped blind hole; two rows of resonant cavities close to the O-shaped blind holes are sequentially connected to form a rectangle, and the crossing position of two diagonal lines of the rectangle is also provided with another O-shaped blind hole; grooves with different shapes are further formed in the upper surface of the ceramic medium, so that coupling between adjacent resonant cavities is achieved.
The resonant cavities comprise a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity; the two O-shaped blind holes are respectively a first O-shaped blind hole and a second O-shaped blind hole, the first O-shaped blind hole is arranged in the center of a diagonal line of a rectangle formed by the third resonant cavity, the fourth resonant cavity, the fifth resonant cavity and the sixth resonant cavity in an enclosed mode, and the second O-shaped blind hole is arranged on the width side face adjacent to the fourth resonant cavity and the fifth resonant cavity.
The grooves comprise cross-shaped grooves arranged among the first resonant cavity, the second resonant cavity, the third resonant cavity and the sixth resonant cavity.
And a third O-shaped blind hole is arranged at the center between the fifth resonant cavity and the sixth resonant cavity.
A dielectric-filled waveguide filter comprising the dielectric filter topology of any one of the above.
The invention has the beneficial effects that: according to the invention, the frequency response curve with symmetrical zero points can be realized by arranging the second O-shaped blind hole on the side surface of the dielectric filter and arranging the first O-shaped blind hole on the upper surface of the dielectric filter.
Drawings
FIG. 1 is a schematic diagram of a prior art ceramic dielectric filled waveguide filter;
FIG. 2 is a perspective view of the ceramic dielectric filled waveguide filter of FIG. 1;
FIG. 3 is a frequency response curve of a dielectric filter in the structure of FIG. 1;
FIG. 4 is a top view of a dielectric filter topology of the present invention;
FIG. 5 is a perspective view of a dielectric filter topology of the present invention;
FIG. 6 is a left side view of a dielectric filter topology of the present invention;
FIG. 7 is a frequency response curve of a dielectric filter having the topology of the present invention;
the labels in the figure are: 1. the resonant cavity comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, a sixth resonant cavity and a fourth resonant cavity, wherein the first resonant cavity is 2; 7. a first trench branch, 8, a second trench branch, 9, a third trench branch, 10, a first "O" trench, 11, a second "O" trench, 12, a fourth trench branch; 13. the structure comprises a first cross-shaped groove branch, a second cross-shaped groove branch, a first O-shaped blind hole, a second O-shaped blind hole, a third O-shaped blind hole, a first O-shaped blind hole, a second O-shaped blind hole, a third O-shaped blind hole and a third cross-shaped groove branch, wherein the first cross-shaped groove branch is 14, the second cross-shaped groove branch is 15.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to fig. 4-7, a dielectric filter topology includes a ceramic medium having a rectangular parallelepiped shape as a whole, four corners of a side surface of the ceramic medium are rounded corners, six blind holes are uniformly formed on an upper surface of the ceramic medium as six resonant cavities, namely, a first resonant cavity 1, a second resonant cavity 2, a third resonant cavity 3, a fourth resonant cavity 4, a fifth resonant cavity 5 and a sixth resonant cavity 6, which are arranged in three rows, and a connecting line between the first resonant cavity 1 and the second resonant cavity 2, a connecting line between the third resonant cavity 3 and the sixth resonant cavity 6, and a connecting line between the fourth resonant cavity 4 and the fifth resonant cavity 5 are parallel to a width direction of the ceramic medium; the first resonant cavity 1, the second resonant cavity 2, the third resonant cavity 3 and the sixth resonant cavity 6 are taken as vertexes and are sequentially connected to form a first rectangle, and the third resonant cavity 3, the sixth resonant cavity 6, the fourth resonant cavity 4 and the fifth resonant cavity 5 are taken as vertexes and are sequentially connected to form a second rectangle; a cross-shaped groove is arranged in the first rectangular area, a first branch 13 of the cross-shaped groove points to the center of a connecting line of the first resonant cavity 1 and the second resonant cavity 2, a second branch 14 of the cross-shaped groove points to the center of a connecting line of the second resonant cavity 2 and the third resonant cavity 3, a third branch 18 of the cross-shaped groove points to the center of a connecting line of the third resonant cavity 3 and the sixth resonant cavity 6, a fourth branch of the cross-shaped groove points to the center of a connecting line of the first resonant cavity 1 and the sixth resonant cavity 6, the length of each branch of the cross-shaped groove is determined by the coupling quantity of the relevant resonant cavity, the coupling quantity is small, the length of the corresponding branch is short, and conversely. In the second rectangular area, a first O-shaped blind hole 15 is formed at the position where two diagonal lines of the rectangle are crossed, and a third O-shaped blind hole 17 is formed at the central position of a connecting line of the fifth resonant cavity 5 and the sixth resonant cavity 6; a second O-shaped blind hole 16 is further disposed on one width side of the ceramic dielectric, the second O-shaped blind hole 16 is adjacent to the fourth resonant cavity 4 and the fifth resonant cavity 5 and is located at the center of the width side, and the fourth resonant cavity 4 and the fifth resonant cavity 5 are symmetrical with respect to the center line of the second O-shaped blind hole 16.
A medium-filled waveguide filter adopts the topological structure, the coupling size between a first resonant cavity 1 and a second resonant cavity 2 can be adjusted through a first groove branch 13, the coupling size between the second resonant cavity 2 and a third resonant cavity 3 can be adjusted through a second groove branch 14, the coupling size between the third resonant cavity 3 and a sixth resonant cavity 6 can be adjusted through a third groove branch 18, and the coupling size between the sixth resonant cavity 6 and the first resonant cavity 1 can be adjusted through a fourth groove branch; the coupling amount of the fifth resonant cavity 5 and the sixth resonant cavity 6 is increased through the third O-shaped blind hole 17; symmetry of left and right zero points on a response curve is realized by arranging the first O-shaped blind hole 15 and the second O-shaped blind hole 16, as shown in FIG. 7, wherein the main coupling of the second O-shaped blind hole 16 is capacitive coupling, the deeper the depth is, the smaller the coupling amount is, the holes are most symmetrical on two sides of the zero point when 1/2 and 1/2 of the width of the ceramic medium are in the holes, and the zero points on two sides are changed along with the movement of the position.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (5)
1. A topological structure of a dielectric filter comprises a cuboid ceramic medium, wherein a plurality of rows of resonant cavities are arranged on the upper surface of the ceramic medium along the length direction of the ceramic medium, each row is provided with two resonant cavities, and the central connecting line of the two resonant cavities on the same row is parallel to the width direction of the ceramic medium, and the topological structure is characterized in that: an O-shaped blind hole extending along the length direction of the ceramic medium is arranged at the center of one width side of the ceramic medium, the diameter of the O-shaped blind hole is greater than 2/3 of the thickness of the ceramic medium, and two resonant cavities in any row on the upper surface of the ceramic medium are symmetrically arranged around the O-shaped blind hole; two rows of resonant cavities close to the O-shaped blind holes are sequentially connected to form a rectangle, and the crossing position of two diagonal lines of the rectangle is also provided with another O-shaped blind hole; grooves with different shapes are further formed in the upper surface of the ceramic medium, so that coupling between adjacent resonant cavities is achieved.
2. A dielectric filter topology according to claim 1, wherein: the resonant cavities comprise a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity; the two O-shaped blind holes are respectively a first O-shaped blind hole and a second O-shaped blind hole, the first O-shaped blind hole is arranged in the center of a diagonal line of a rectangle formed by the third resonant cavity, the fourth resonant cavity, the fifth resonant cavity and the sixth resonant cavity in an enclosed mode, and the second O-shaped blind hole is arranged on the width side face adjacent to the fourth resonant cavity and the fifth resonant cavity.
3. A dielectric filter topology according to claim 2, wherein: the grooves comprise cross-shaped grooves arranged among the first resonant cavity, the second resonant cavity, the third resonant cavity and the sixth resonant cavity.
4. A dielectric filter topology according to claim 2, wherein: and a third O-shaped blind hole is arranged at the center between the fifth resonant cavity and the sixth resonant cavity.
5. A dielectric-filled waveguide filter, characterized by: comprising a dielectric filter topology according to any of claims 1 to 4.
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| CN202010956072.9A CN112164848B (en) | 2020-09-11 | 2020-09-11 | Topological structure of dielectric filter and dielectric filling waveguide filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000661A (en) * | 2022-06-24 | 2022-09-02 | 江苏贝孚德通讯科技股份有限公司 | Dual-mode dielectric waveguide filter applied to 5G communication system |
| SE2250447A1 (en) * | 2021-03-22 | 2022-09-29 | Chengdu Lingyi Communication Tech Co Ltd | Circular filter assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110011018A (en) * | 2019-05-23 | 2019-07-12 | 苏州波发特电子科技有限公司 | A kind of dielectric filter coupled structure being easy to debug symmetrical zero point |
| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN210142706U (en) * | 2019-08-27 | 2020-03-13 | 京信通信技术(广州)有限公司 | Duplexer, dielectric filter and capacitive coupling structure thereof |
| CN210956933U (en) * | 2020-01-14 | 2020-07-07 | 苏州海瓷达材料科技有限公司 | Symmetrical zero structure of dielectric waveguide filter and filter thereof |
| CN212412166U (en) * | 2020-09-11 | 2021-01-26 | 广东通宇通讯股份有限公司 | Topological structure of dielectric filter and dielectric-filled waveguide filter |
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2020
- 2020-09-11 CN CN202010956072.9A patent/CN112164848B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011018A (en) * | 2019-05-23 | 2019-07-12 | 苏州波发特电子科技有限公司 | A kind of dielectric filter coupled structure being easy to debug symmetrical zero point |
| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN210142706U (en) * | 2019-08-27 | 2020-03-13 | 京信通信技术(广州)有限公司 | Duplexer, dielectric filter and capacitive coupling structure thereof |
| CN210956933U (en) * | 2020-01-14 | 2020-07-07 | 苏州海瓷达材料科技有限公司 | Symmetrical zero structure of dielectric waveguide filter and filter thereof |
| CN212412166U (en) * | 2020-09-11 | 2021-01-26 | 广东通宇通讯股份有限公司 | Topological structure of dielectric filter and dielectric-filled waveguide filter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE2250447A1 (en) * | 2021-03-22 | 2022-09-29 | Chengdu Lingyi Communication Tech Co Ltd | Circular filter assembly |
| WO2022199254A1 (en) * | 2021-03-22 | 2022-09-29 | 成都领益通信技术有限公司 | Circular filter assembly |
| US11962058B1 (en) | 2021-03-22 | 2024-04-16 | Chengdu Lingyi Communication Technology Co., Ltd. | Circular filter assembly |
| CN115000661A (en) * | 2022-06-24 | 2022-09-02 | 江苏贝孚德通讯科技股份有限公司 | Dual-mode dielectric waveguide filter applied to 5G communication system |
| CN115000661B (en) * | 2022-06-24 | 2023-06-16 | 江苏贝孚德通讯科技股份有限公司 | Dual-mode dielectric waveguide filter applied to 5G communication system |
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