CN110556613B - Dielectric filter and cross coupling structure for adjusting symmetry of transmission zero - Google Patents
Dielectric filter and cross coupling structure for adjusting symmetry of transmission zero Download PDFInfo
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- CN110556613B CN110556613B CN201910934863.9A CN201910934863A CN110556613B CN 110556613 B CN110556613 B CN 110556613B CN 201910934863 A CN201910934863 A CN 201910934863A CN 110556613 B CN110556613 B CN 110556613B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 33
- 238000006880 cross-coupling reaction Methods 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 48
- 238000010168 coupling process Methods 0.000 claims abstract description 48
- 238000005859 coupling reaction Methods 0.000 claims abstract description 48
- 230000001939 inductive effect Effects 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 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
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Abstract
The invention relates to a cross coupling structure for adjusting symmetry of transmission zero points, which is a blind groove used for realizing coupling between two non-adjacent blind hole resonators, wherein the blind groove can be connected with any one or two of the two non-adjacent blind hole resonators or can not be connected to form an independent blind groove. After the blind groove is added, the symmetry of transmission zero points at two ends of the pass band can be adjusted, the longer the blind groove is, the closer the transmission zero point at the lower end of the pass band is to the pass band than the transmission zero point at the higher end of the pass band, and on the contrary, the two transmission zero points tend to be symmetrical.
Description
Technical Field
The invention relates to a dielectric filter and a cross coupling structure for adjusting symmetry of transmission zeros, belonging to the technical field of electronic components in the field of communication.
Background
In recent years, with increasing demands for high performance and miniaturization of communication devices, dielectric filters have been increasingly paid attention to. However, the prior dielectric filter coupling structure with symmetrical zero arrangement characteristic is fixed, namely, the zero at the high end of the filter passband is always closer to the passband than the zero at the low end.
Disclosure of Invention
The invention provides a cross coupling structure for adjusting symmetry of transmission zero points, which can change symmetry of the symmetry zero points, namely realize that the zero point at the lower end of a passband of a wave device is closer to the passband than the zero point at the higher end, and the specific scheme is as follows:
A cross coupling structure for adjusting transmission zero symmetry comprises a first blind hole resonator, a second blind hole resonator, a third blind hole resonator, a fourth blind hole resonator, a coupling window between the first blind hole resonator and the second blind hole resonator, a coupling hole between the second blind hole resonator and the third blind hole resonator, a coupling window between the third blind hole resonator and the fourth blind hole resonator, a coupling window between the first blind hole resonator and the fourth blind hole resonator, and a coupling blind groove between the first blind hole resonator and the third blind hole resonator.
Further, the coupling formed by the coupling windows between the first blind hole resonator and the second blind hole resonator is inductive coupling, the coupling formed by the coupling holes between the second blind hole resonator and the third blind hole resonator is capacitive coupling, the coupling formed by the coupling windows between the third blind hole resonator and the fourth blind hole resonator is inductive coupling, the coupling windows between the first blind hole resonator and the fourth blind hole resonator are inductive coupling, and the coupling blind slot between the first blind hole resonator and the third blind hole resonator is inductive coupling.
Further, the coupling amount formed by the in-line blind slot for adjusting the symmetry of the transmission zero point is related to the length, depth and width of the blind slot, and the longer the length, the larger the coupling amount, and vice versa; the deeper the depth, the greater the amount of coupling and vice versa; the wider the width, the greater the amount of coupling and vice versa. The greater the amount of coupling, the closer the transmission zeroes at the low end of the passband are to the passband than the transmission zeroes at the high end of the passband, whereas the two transmission zeroes tend to be more symmetrical.
The beneficial effects obtained by the invention are as follows: according to the invention, cross coupling between non-adjacent resonators is realized by introducing the linear blind grooves, so that the symmetrical zero points can be arranged more flexibly, and the transmission zero point at the lower end of the pass band is closer to the pass band than the transmission zero point at the upper end of the pass band, thereby improving the design flexibility of the dielectric filter.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of a dielectric filter body in embodiment 1;
Fig. 3 is an equivalent circuit diagram of the dielectric filter body in embodiment 1;
Fig. 4 is a frequency response curve of the dielectric filter body in embodiment 1.
Detailed Description
A cross coupling structure for adjusting symmetry of transmission zeros as shown in fig. 1 is a straight blind slot, which can adjust symmetry of transmission zeros at two ends of a passband, and the longer the blind slot is, the closer the transmission zeros at the lower end of the passband are to the passband than the transmission zeros at the upper end of the passband, otherwise, the two transmission zeros tend to be more symmetrical.
Example 1
Based on the scheme, in one embodiment, the cross coupling structure is used for an 8-order dielectric filter, so that the transmission zero symmetry is adjusted.
As shown in fig. 2, the 8-stage dielectric filter is composed of 8 blind hole resonators 10, 11 … …,17 and coupling structures 18, 19 … … therebetween. Referring to fig. 3, the blind hole resonators 10, 11 … …,17 correspond to the resonant cells 1, 2 … … 8 in the equivalent circuit, wherein the coupling windows 18 between the blind hole resonators 10, 11 correspond to the inductive coupling between the resonant cells 1, 2 in the equivalent circuit, and similarly, the coupling windows 20, 21, 22, 24, 25, 28 are all inductive coupling, and the coupling holes 19, 23 are all capacitive coupling.
The first 4 resonator elements 1,2, 3, 4 as shown in fig. 3 form two transmission zeroes 29, 30 which are symmetrical as shown in fig. 4; the last 4 resonator elements 5, 6, 7, 8 form two transmission zeroes 31, 32 which are symmetrical as shown in fig. 4. After the cross-coupling structure 26 of the present invention is added to the first 4 resonant cells, the symmetry of the two transmission zeroes 29, 30 is significantly adjusted as shown in fig. 4, and the transmission zeroes 29 at the lower end of the passband are closer to the passband than the transmission zeroes 30 at the upper end of the passband. The transmission zeroes 31, 32 formed in the last 4 resonant cells are more symmetrical due to the lack of the cross-coupling structure of the present invention.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A dielectric filter, characterized by: the device comprises a first blind hole resonator, a second blind hole resonator, a third blind hole resonator, a fourth blind hole resonator, a fifth blind hole resonator, a sixth blind hole resonator, a seventh blind hole resonator, an eighth blind hole resonator, a first cross coupling structure for adjusting symmetry of transmission zero points, wherein the first cross coupling structure is a straight coupling blind groove; the first blind hole resonator, the second blind hole resonator, the third blind hole resonator and the fourth blind hole resonator are arranged in a matrix in the clockwise direction, and the eighth blind hole resonator, the seventh blind hole resonator, the sixth blind hole resonator and the fifth blind hole resonator are symmetrically distributed with the first blind hole resonator, the second blind hole resonator, the third blind hole resonator and the fourth blind hole resonator along the axis of the medium body; a coupling window or a coupling hole is arranged between any two adjacent blind hole resonators, the coupling window is inductive coupling, and the coupling hole is capacitive coupling; the straight coupling blind groove is arranged between the first blind hole resonator and the eighth blind hole resonator, and the length direction of the coupling blind groove is consistent with the connecting line direction of the first blind hole resonator and the fourth blind hole resonator;
the symmetry of transmission zero points at two ends of the pass band is adjusted by the in-line coupling blind groove, the longer the blind groove is, the closer the transmission zero point at the lower end of the pass band is to the pass band than the transmission zero point at the upper end of the pass band, otherwise, the two transmission zero points tend to be symmetrical.
2. A dielectric filter according to claim 1, characterized in that: the second cross-coupling structure is positioned between the first blind hole resonator and the third blind hole resonator or between the second blind hole resonator and the fourth blind hole resonator.
3. A dielectric filter according to claim 1, characterized in that: the coupling amount formed by the coupling blind grooves is related to the length, depth and width of the coupling blind grooves, and the longer the length is, the larger the coupling amount is, and vice versa; the deeper the depth, the greater the amount of coupling and vice versa; the wider the width, the greater the amount of coupling and vice versa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910934863.9A CN110556613B (en) | 2019-09-29 | 2019-09-29 | Dielectric filter and cross coupling structure for adjusting symmetry of transmission zero |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910934863.9A CN110556613B (en) | 2019-09-29 | 2019-09-29 | Dielectric filter and cross coupling structure for adjusting symmetry of transmission zero |
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| Publication Number | Publication Date |
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| CN110556613A CN110556613A (en) | 2019-12-10 |
| CN110556613B true CN110556613B (en) | 2024-06-04 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109461995B (en) * | 2018-12-27 | 2024-08-09 | 华为技术有限公司 | Waveguide filter adopting ceramic dielectric |
| CN210723301U (en) * | 2019-12-25 | 2020-06-09 | 中兴通讯股份有限公司 | Cross-coupling dielectric filter and equipment |
| CN111129672A (en) * | 2020-01-17 | 2020-05-08 | 江苏江佳电子股份有限公司 | Frequency and capacitance coupling double-modulation resonance structure, application thereof and filter comprising structure |
| IT202000020311A1 (en) * | 2020-08-21 | 2022-02-21 | Commscope Italy Srl | METALLIZED DIELECTRIC WAVEGUIDE FILTERS WITH IRREGULARLY SHAPED RESONANT CAVITIES, INCLINED METALLIC APERTURES, AND/OR SPURIOUS COUPLING WINDOWS |
| WO2021175975A1 (en) * | 2020-03-04 | 2021-09-10 | Commscope Italy S.R.L. | Metallized dielectric waveguide filters having irregular shaped resonant cavities, slanted metallized openings and/or spurious coupling windows |
| US11509029B2 (en) | 2020-03-18 | 2022-11-22 | Cts Corporation | RF dielectric waveguide filter |
| CN111600100A (en) * | 2020-06-30 | 2020-08-28 | 瑞声精密制造科技(常州)有限公司 | Capacitive and inductive cross coupling structure and dielectric waveguide filter |
| CN114335936B (en) * | 2020-09-30 | 2022-12-02 | 华为技术有限公司 | Filter and communication equipment |
| 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 |
| CN115528395A (en) * | 2021-06-25 | 2022-12-27 | 华为技术有限公司 | Four-corner element structure, dielectric filter and base station equipment |
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2019
- 2019-09-29 CN CN201910934863.9A patent/CN110556613B/en active Active
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