CN210723301U - Cross-coupling dielectric filter and equipment - Google Patents
Cross-coupling dielectric filter and equipment Download PDFInfo
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- CN210723301U CN210723301U CN201922367883.0U CN201922367883U CN210723301U CN 210723301 U CN210723301 U CN 210723301U CN 201922367883 U CN201922367883 U CN 201922367883U CN 210723301 U CN210723301 U CN 210723301U
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- blind hole
- tuning blind
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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
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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
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Abstract
The cross coupling dielectric filter comprises a dielectric resonance main body, wherein the dielectric resonance main body is provided with through grooves and/or through holes so as to form at least six dielectric resonant cavities which are arranged in a U shape; each medium resonant cavity is provided with a corresponding frequency tuning blind hole; setting a capacitive coupling tuning blind hole and an inductive coupling tuning blind hole at the preset coupling window position between the adjacent frequency tuning blind holes; the frequency tuning hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole are all arranged on the same surface of the dielectric resonance main body. By arranging the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole, the coupling polarity of the main coupling and the cross coupling of the filter is changed, the out-of-band rejection of the filter is improved, and the flexibility of a topological structure is improved.
Description
Technical Field
The present application relates to mobile communication technologies, and in particular, to a cross-coupled dielectric filter and a device.
Background
The rapid development of communication technology is driving the development of communication base station equipment to miniaturization, integration and light weight. Dielectric filters are widely used in base station equipment due to their good performance, small size and light weight. With the increasing of the suppression requirement, the prior art that more symmetrical zero point topologies are applied cannot meet the requirement, and a more flexible and conveniently tuned topology is required to improve the out-of-band suppression capability of the filter.
SUMMERY OF THE UTILITY MODEL
The application provides a cross-coupled dielectric filter, comprising a dielectric resonant body,
through grooves and/or through holes are formed in the medium resonance main body to form at least six medium resonant cavities which are arranged in a U shape;
each medium resonant cavity is provided with a corresponding frequency tuning blind hole;
setting a capacitive coupling tuning blind hole or an inductive coupling tuning blind hole at a preset coupling window position between adjacent frequency tuning blind holes; the frequency tuning hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole are all arranged on the same surface of the dielectric resonance main body.
The application provides a wireless communication base station device, which comprises any cross-coupling medium filter in the embodiment of the application.
According to the cross-coupling dielectric filter and the device provided by the embodiment of the application, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole are arranged, and the coupling polarity of the main coupling and the cross coupling of the filter is changed, so that the effects of improving the out-of-band rejection of the filter and improving the flexibility of a topological structure are achieved.
Drawings
Fig. 1 is a front view of a cross-coupled dielectric filter.
Fig. 2 is a coupling polarity diagram of the cross-coupled dielectric filter of fig. 1.
Fig. 3 is a frequency response diagram of the cross-coupled dielectric filter of fig. 1.
Fig. 4 is a front view of a cross-coupled dielectric filter.
Fig. 5 is a coupling polarity diagram of the cross-coupled dielectric filter of fig. 4.
Fig. 6 is a frequency response diagram of the cross-coupled dielectric filter of fig. 4.
Fig. 7 is a schematic structural diagram of a wireless communication base station apparatus.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The cross-coupling dielectric filter provided by the embodiment of the application comprises a dielectric resonance main body, wherein the dielectric resonance main body is provided with through grooves and/or through holes so as to form at least six dielectric resonant cavities which are arranged in a U shape; each medium resonant cavity is provided with a corresponding frequency tuning blind hole; setting a capacitive coupling tuning blind hole or an inductive coupling tuning blind hole at a preset coupling window position between adjacent frequency tuning blind holes; the frequency tuning hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole are all arranged on the same surface of the dielectric resonance main body.
The dielectric resonance main body can be a cuboid, and through grooves and/or through holes are formed in the dielectric resonance main body to form a dielectric resonant cavity and a coupling window between the dielectric resonant cavity and the dielectric resonant cavity. Through grooves and/or through holes can be formed in the medium resonance main body, at least six medium resonant cavities are formed in the medium resonance main body and are sequentially arranged along the U shape, and the medium resonant cavities are used for frequency screening, so that useful frequency resonance passes and useless frequency is inhibited. Each dielectric resonant cavity is provided with a corresponding frequency tuning blind hole, namely the frequency tuning blind holes are also sequentially arranged along the U shape, so that electromagnetic wave energy can be transmitted along the U shape in the dielectric resonant main body. The frequency tuning blind holes are used for tuning the frequency of the cross-coupled filter. And main coupling windows are formed between adjacent frequency tuning blind holes arranged according to the U shape, and cross coupling windows are formed between adjacent frequency tuning blind holes positioned on different rows of the U shape. The size and the shape of the medium resonant cavity and the area of the coupling window are adjusted by adjusting the opening position, the shape and the area of the through groove and/or the through hole.
According to the requirement of the filter for enhancing or suppressing the preset frequency of the electromagnetic signal, a capacitive coupling tuning blind hole and an inductive coupling tuning blind hole are arranged on the dielectric resonance main body, are arranged at the position of a coupling window between two adjacent frequency tuning blind holes and are respectively used for forming capacitive coupling with an electric field as a main part and inductive coupling with stronger coupling to generate out-of-band zero point enhancement suppression.
In one implementation, the dielectric resonator body is made of ceramic. That is, the dielectric resonant body may be composed of a solid ceramic material having a high relative dielectric constant, and electromagnetic wave energy is transmitted inside the dielectric resonant body.
In one implementation, the dielectric resonator is a hexahedron. For example, the dielectric resonator is a cuboid or a cube.
In one implementation, the cross-coupled dielectric filter further includes:
and the metal shielding layer is arranged on the inner surfaces or the side walls of the frequency tuning hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole. The metal shielding layer is used for shielding interference signals, and the frequency and the coupling of the filter can be finely adjusted by adjusting the area of the metal shielding layer on the inner surface or the side wall of the frequency tuning blind hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole.
In one implementation, the depth of the capacitively coupled tuning blind via exceeds 1/3 of the dielectric resonant body thickness; the depth of the inductive coupling tuning blind hole does not exceed 1/3 of the thickness of the dielectric resonance main body.
Example one:
fig. 1 is a front view of a cross-coupled dielectric filter according to an embodiment of the present application. As shown in fig. 1, a first frequency tuning blind hole 1, a second frequency tuning blind hole 2, a third frequency tuning blind hole 3, a fourth frequency tuning blind hole 4, a fifth frequency tuning blind hole 5 and a sixth frequency tuning blind hole 6 are arranged on a dielectric resonance main body 100 in a U-shape in sequence; a first capacitively coupled tuned blind via setting 7 is arranged at a main coupling window position between the second frequency tuned blind via 2 and the third frequency tuned blind via 3; a second capacitively coupled tuned blind via 8 is provided at the location of the main coupling window between said fourth frequency tuned blind via and said fifth frequency tuned blind via; a first inductively coupled tuned blind via 9 is arranged at the location of the cross-coupling window between the second frequency tuned blind via and the fourth frequency tuned blind via.
A first coupling window 12 is formed between the first frequency tuning blind hole 1 and the second frequency tuning blind hole 2, a second coupling window 23 is formed between the second frequency tuning blind hole 2 and the third frequency tuning blind hole 3, a third coupling window 34 is formed between the third frequency tuning blind hole 3 and the fourth frequency tuning blind hole 4, a fourth coupling window 45 is formed between the fourth frequency tuning blind hole 4 and the fifth frequency tuning blind hole 5, and a fifth coupling window 56 is formed between the fifth frequency tuning blind hole 5 and the sixth frequency tuning blind hole 6. Five main coupling windows among the six dielectric resonant cavities enable electromagnetic signals to be transmitted from the dielectric resonant cavity where the first frequency tuning blind hole 1 is located to the dielectric resonant cavity where the sixth frequency tuning blind hole 6 is located in sequence. A first cross-coupling window 24 is formed between the second frequency tuning blind hole 2 and the fourth frequency tuning blind hole 4, and a second cross-coupling window 25 is formed between the second frequency tuning blind hole 2 and the fifth frequency tuning blind hole 5.
Fig. 2 shows a coupling polarity diagram of the cross-coupled dielectric filter of fig. 1. The first main coupling window 12, the third main coupling window 34 and the fifth main coupling window 56 generate inductive coupling, the first capacitive coupling tuning blind hole 7 is added at the position of the second main coupling window 23, so that the coupling polarity is subjected to phase reversal to generate negative coupling, and the second capacitive coupling tuning blind hole 8 is added at the position of the fourth main coupling window 45, so that the coupling polarity is also subjected to phase reversal to generate negative coupling. The first cross-coupling window 24 and the second cross-coupling window 25 create inductive coupling, wherein the first cross-coupling window 24 adds a first inductively coupled tuned blind via arrangement 9 to enhance inductive coupling.
Fig. 3 shows a frequency response diagram of the cross-coupled dielectric filter of fig. 1. The cross-coupling dielectric filter can form two transmission zero points at the out-of-band low end through the dielectric resonant cavity, the frequency tuning blind hole, the coupling window, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole, so that the out-of-band rejection capability of the cross-coupling dielectric filter is enhanced. The main coupling and the cross coupling of the cross-coupled dielectric filter have capacitive and inductive two-polarity coupling, the inductive coupling is determined by the area sizes of the first main coupling window 12, the third main coupling window 34, the fifth main coupling window 56, the first cross coupling window 24 and the second cross coupling window 25, the coupling is stronger when the window size is larger, and vice versa; the capacitive coupling is controlled by the depth of the first capacitively coupled tuning blind via 7 in the second main coupling window 23 and the second capacitively coupled tuning blind via 8 in the fourth main coupling window 45, which is required to exceed 1/3 the thickness of the dielectric resonant body. Wherein the depth of the first inductively coupled tuning blind via 9 does not exceed 1/3 the thickness of the dielectric resonant body. The strength of the strongest pole C1 can be tuned by adjusting the depth of its blind hole and the portion of the metal shielding layer. The strength of the lower strongest pole C1 can also be tuned by adjusting the position of the first inductively coupled tuning blind via 9 in the first cross-coupling window 24, the closer the axes are to the second frequency tuning blind via 2 and the fourth frequency tuning blind via 4, the stronger the poles are, and vice versa. The strength of the low-end next-strong pole C2 can be tuned by changing the size of the second cross-coupling window 25, with larger windows being stronger poles and vice versa.
Example two:
fig. 4 is a front view of a cross-coupled dielectric filter according to an embodiment of the present application. As shown in fig. 4, a first frequency tuning blind hole 1, a second frequency tuning blind hole 2, a third frequency tuning blind hole 3, a fourth frequency tuning blind hole 4, a fifth frequency tuning blind hole 5 and a sixth frequency tuning blind hole 6 are arranged on the dielectric resonance main body 100 in a U-shape in sequence; a third capacitively coupled tuned blind via arrangement 10 is arranged at the position of the main coupling window between said first frequency tuned blind via 1 and said second frequency tuned blind via 2; a second inductively coupled tuned blind via is arranged 11 at the location of the cross-coupling window between the second frequency tuned blind via 2 and the fourth frequency tuned blind via 4.
A first coupling window 12 is formed between the first frequency tuning blind hole 1 and the second frequency tuning blind hole 2, a second coupling window 23 is formed between the second frequency tuning blind hole 2 and the third frequency tuning blind hole 3, a third coupling window 34 is formed between the third frequency tuning blind hole 3 and the fourth frequency tuning blind hole 4, a fourth coupling window 45 is formed between the fourth frequency tuning blind hole 4 and the fifth frequency tuning blind hole 5, and a fifth coupling window 56 is formed between the fifth frequency tuning blind hole 5 and the sixth frequency tuning blind hole 6. Five main coupling windows among the six dielectric resonant cavities enable electromagnetic signals to be transmitted from the dielectric resonant cavity where the first frequency tuning blind hole 1 is located to the dielectric resonant cavity where the sixth frequency tuning blind hole 6 is located in sequence. A first cross-coupling window 24 is formed between the second frequency tuning blind hole 2 and the fourth frequency tuning blind hole 4, and a second cross-coupling window 25 is formed between the second frequency tuning blind hole 2 and the fifth frequency tuning blind hole 5.
Fig. 5 shows a coupling polarity diagram of the cross-coupled dielectric filter of fig. 4. The second main coupling window 23, the third main coupling window 34, the fourth main coupling window 45 and the fifth main coupling window 56 generate inductive coupling, and negative coupling is generated due to the fact that the third capacitive coupling tuning blind hole 10 is added at the position of the first main coupling window 12, the coupling polarity is reversed, and phase inversion occurs. The first cross-coupling window 24 and the second cross-coupling window 25 create inductive coupling, wherein the addition of the second inductively coupled tuned blind via arrangement 11 to the first cross-coupling window 24 enhances inductive coupling.
Fig. 6 shows a frequency response diagram of the cross-coupled dielectric filter of fig. 4. The cross-coupling dielectric filter can form two transmission zero points with high out-of-band ends through the dielectric resonant cavity, the frequency tuning blind hole, the coupling window, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole, and the out-of-band rejection capability of the cross-coupling dielectric filter is enhanced. The main coupling and the cross coupling of the cross-coupled dielectric filter have capacitive and inductive two-polarity coupling, the inductive coupling is determined by the area sizes of the second main coupling window 23, the third main coupling window 34, the fourth main coupling window 45, the fifth main coupling window 56, the first cross coupling window 24 and the second cross coupling window 25, the coupling is stronger when the window size is larger, and vice versa; the capacitive coupling is controlled by the depth of the third capacitively coupled tuned blind via 10 in the first main coupling window 12, which needs to exceed 1/3 the thickness of the dielectric resonator body, and functions to eliminate the parasitic coupling caused by the second cross-coupling window 25 and avoid the influence thereof on the out-of-band rejection performance of the cross-coupled dielectric filter. Wherein the depth of the second inductively coupled tuned blind via 11 does not exceed 1/3 the thickness of the dielectric resonant body. The strength of the strongest pole L1 can be tuned by adjusting the depth of the blind hole and the part of the metal shielding layer. The strength of the strongest pole L1 at the high end can also be tuned by adjusting the position of the second inductively coupled tuning blind via 11 in the first cross-coupling window 24, and the pole is stronger the closer to the axis position in the second frequency tuning blind via 2 and the fourth frequency tuning blind via 4, and vice versa. The strength of the high-end next-strong pole L2 can be tuned by changing the size of the second cross-coupling window 25, the larger the window the stronger the pole, and vice versa.
The cross-coupling dielectric filter provided by the embodiment of the application realizes 2 single-side transmission zero points of high and low passband by introducing the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole, so that the arrangement of the zero points can be more flexible, the strength of the tuning zero points is convenient, and the cross-coupling dielectric filter also has a structure appearance which is easy to machine and form. Therefore, the design flexibility of the cross-coupled dielectric filter is improved, and the cost is reduced.
Fig. 7 shows a wireless communication base station apparatus 200 provided in an embodiment of the present application, including any one of the cross-coupled dielectric filters 100 in the embodiment of the present application.
The foregoing has provided by way of exemplary and non-limiting examples a detailed description of exemplary embodiments of the present application. Various modifications and adaptations to the foregoing embodiments may become apparent to those skilled in the relevant arts in view of the following drawings and the appended claims, without departing from the scope of the invention. Accordingly, the proper scope of the invention is to be determined according to the claims.
Claims (9)
1. A cross-coupled dielectric filter comprising a dielectric resonant body, characterized in that:
through grooves and/or through holes are formed in the medium resonance main body to form at least six medium resonant cavities which are arranged in a U shape;
each medium resonant cavity is provided with a corresponding frequency tuning blind hole;
setting a capacitive coupling tuning blind hole and an inductive coupling tuning blind hole at the preset coupling window position between the adjacent frequency tuning blind holes; the frequency tuning blind hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole are all arranged on the same surface of the dielectric resonance main body.
2. The cross-coupled dielectric filter of claim 1, wherein the dielectric resonator body is made of ceramic.
3. The cross-coupled dielectric filter of claim 1, further comprising:
and the metal shielding layer is arranged on the inner surfaces or the side walls of the frequency tuning hole, the capacitive coupling tuning blind hole and the inductive coupling tuning blind hole.
4. The cross-coupled dielectric filter of claim 1, wherein:
1/3, the depth of the capacitively coupled tuning blind hole exceeds the thickness of the dielectric resonant body;
the depth of the inductive coupling tuning blind hole does not exceed 1/3 of the thickness of the dielectric resonance main body.
5. The cross-coupled dielectric filter of claim 1, wherein:
the medium resonant cavity is a hexahedron.
6. The cross-coupled dielectric filter of claim 5, wherein:
the medium resonant cavity is a cuboid or a cube.
7. The cross-coupled dielectric filter of any of claims 1-6, wherein:
the dielectric resonance main body is provided with a first frequency tuning blind hole, a second frequency tuning blind hole, a third frequency tuning blind hole, a fourth frequency tuning blind hole, a fifth frequency tuning blind hole and a sixth frequency tuning blind hole which are sequentially arranged in a U shape;
the first capacitive coupling tuning blind hole is arranged at the position of a main coupling window between the second frequency tuning blind hole and the third frequency tuning blind hole;
the second capacitive coupling tuning blind hole is arranged at the position of a main coupling window between the fourth frequency tuning blind hole and the fifth frequency tuning blind hole;
the first inductive coupling tuning blind hole is arranged at the position of a cross coupling window between the second frequency tuning blind hole and the fourth frequency tuning blind hole.
8. The cross-coupled dielectric filter of any of claims 1-6, wherein:
the dielectric resonance main body is provided with a first frequency tuning blind hole, a second frequency tuning blind hole, a third frequency tuning blind hole, a fourth frequency tuning blind hole, a fifth frequency tuning blind hole and a sixth frequency tuning blind hole which are sequentially arranged in a U shape;
a third capacitively coupled tuned blind via is disposed at a location of the primary coupling window between the first frequency tuned blind via and the second frequency tuned blind via;
the second inductive coupling tuning blind hole is arranged at the position of a cross coupling window between the second frequency tuning blind hole and the fourth frequency tuning blind hole.
9. A wireless communication base station apparatus, comprising the cross-coupled dielectric filter of any one of claims 1 to 8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922367883.0U CN210723301U (en) | 2019-12-25 | 2019-12-25 | Cross-coupling dielectric filter and equipment |
| PCT/CN2020/124908 WO2021129133A1 (en) | 2019-12-25 | 2020-10-29 | Cross-coupled dielectric filter and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922367883.0U CN210723301U (en) | 2019-12-25 | 2019-12-25 | Cross-coupling dielectric filter and equipment |
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| CN210723301U true CN210723301U (en) | 2020-06-09 |
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| WO (1) | WO2021129133A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599949A (en) * | 2020-12-24 | 2021-04-02 | 京信射频技术(广州)有限公司 | Dielectric filter and filtering loop thereof |
| WO2021129133A1 (en) * | 2019-12-25 | 2021-07-01 | 中兴通讯股份有限公司 | Cross-coupled dielectric filter and device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5684438A (en) * | 1995-06-21 | 1997-11-04 | Forem, S.P.A. | Microwave filter including a plurality of cross-coupled dielectric resonators |
| CN201130699Y (en) * | 2007-11-16 | 2008-10-08 | 泉州波园射频新技术研究中心 | Microwave low band TM010 module height selectivity cavity dielectric filter |
| EP3007267B1 (en) * | 2013-05-31 | 2017-09-06 | Huawei Technologies Co., Ltd. | Dielectric filter, transceiver and base station |
| 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 |
| CN110504512A (en) * | 2019-07-25 | 2019-11-26 | 江苏江佳电子股份有限公司 | A kind of capacitive coupling structure and the dielectric filter using the structure |
| CN110556613B (en) * | 2019-09-29 | 2024-06-04 | 江西一创新材料有限公司 | Dielectric filter and cross coupling structure for adjusting symmetry of transmission zero |
| CN210723301U (en) * | 2019-12-25 | 2020-06-09 | 中兴通讯股份有限公司 | Cross-coupling dielectric filter and equipment |
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2019
- 2019-12-25 CN CN201922367883.0U patent/CN210723301U/en active Active
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- 2020-10-29 WO PCT/CN2020/124908 patent/WO2021129133A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129133A1 (en) * | 2019-12-25 | 2021-07-01 | 中兴通讯股份有限公司 | Cross-coupled dielectric filter and device |
| CN112599949A (en) * | 2020-12-24 | 2021-04-02 | 京信射频技术(广州)有限公司 | Dielectric filter and filtering loop thereof |
| CN112599949B (en) * | 2020-12-24 | 2022-05-03 | 京信射频技术(广州)有限公司 | Dielectric filter and filtering loop thereof |
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| WO2021129133A1 (en) | 2021-07-01 |
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