CN112952327A - Six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic - Google Patents
Six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic Download PDFInfo
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- CN112952327A CN112952327A CN202110265435.9A CN202110265435A CN112952327A CN 112952327 A CN112952327 A CN 112952327A CN 202110265435 A CN202110265435 A CN 202110265435A CN 112952327 A CN112952327 A CN 112952327A
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 69
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000003989 dielectric material Substances 0.000 claims description 3
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- 239000011248 coating agent Substances 0.000 abstract description 4
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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
The invention discloses a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic, which comprises a ceramic filter body with a conductive metal coating on the outer surface, wherein the body is provided with a tuning hole, a coupling groove and a capacitive coupling structure, the coupling groove is a rectangular groove, and the capacitive coupling structure is a negative coupling blind hole.
Description
Technical Field
The invention belongs to the technical field of microwave communication, and particularly relates to a six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection characteristics.
Background
The rapid development of large-scale antenna technology and the increasingly tense spectrum resources put higher demands on the size, weight and performance of the base station filter. The ceramic waveguide filter becomes the mainstream choice of the current 5G base station filter by virtue of the unique advantages of small volume, high performance and the like. In order to enhance the out-of-band rejection characteristic of the filter, the ceramic waveguide filter generally needs to utilize a coupling structure between the resonant cavity and the cavity to jointly form a capacitive coupling CQ unit, and a pair of transmission zeros are generated outside the pass band.
In the prior art, four resonant cavities can form a CQ unit to generate a pair of transmission zeros; therefore, the N resonant cavities can form N/4 CQ units at most, and N/2 transmission zeros are generated. Therefore, the six-cavity ceramic waveguide filter can only generate one pair of transmission zeros generally, which is not beneficial to realizing the simultaneous regulation and control of the near end and the far end outside the passband of the filter and meets the high out-of-band rejection characteristic; if the out-of-band rejection characteristic of the filter is to be improved, the number of cavities of the filter can only be increased, and an eight-cavity ceramic waveguide filter with a double CQ structure is formed. The increase of the number of the cavities can obviously increase the volume and the weight of the filter, and is not beneficial to the miniaturization design of devices; on the other hand, a pair of transmission zeros generated by the CQ unit are mutually influenced, which is difficult to realize independent adjustment, and is not beneficial to the optimization adjustment of the out-of-band rejection characteristic.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection, and aims to solve the problems that the existing six-cavity ceramic waveguide filter is poor in out-of-band rejection and difficult in debugging of out-of-band rejection characteristics.
In order to achieve the purpose, the invention provides a six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection, which comprises a ceramic filter body with a conductive metal coating on the outer surface, wherein the ceramic filter body is made of a dielectric material, the ceramic filter body is provided with a tuning hole, a coupling groove and a capacitive coupling structure, the coupling groove is a rectangular groove, the capacitive coupling structure is a negative coupling blind hole, and the lower surface of the capacitive coupling structure is provided with an input/output port.
Furthermore, the upper surface of the ceramic waveguide filter body is provided with six tuning holes, the tuning holes and part of the body independently form a resonant cavity to form six resonant cavities, and the tuning holes are blind holes and used for adjusting the resonant frequency of the cavity.
Furthermore, the coupling slot is located at the junction of the resonant cavities to realize inductive coupling.
Furthermore, the negative coupling blind hole is positioned at the joint of the second resonant cavity and the fifth resonant cavity and used for realizing capacitive coupling.
Furthermore, the first, second, fifth and sixth resonant cavities and coupling structures among the cavities jointly form a first capacitive C-coupled Q unit, and the second, third, fourth and fifth resonant cavities and coupling structures among the cavities jointly form a second capacitive coupled CQ unit.
Furthermore, a rectangular groove is formed at the joint of the first resonant cavity and the fifth resonant cavity or the joint of the second resonant cavity and the sixth resonant cavity, so as to realize diagonal coupling of the first CQ unit.
Furthermore, a rectangular groove is formed at the joint of the second resonant cavity and the fourth resonant cavity or the joint of the third resonant cavity and the fifth resonant cavity, so as to realize diagonal coupling of the second CQ unit.
Furthermore, the coupling amount of diagonal coupling can be adjusted by changing the length of the coupling slot at the diagonal connection part in the CQ unit, so that the position of a transmission zero point can be adjusted.
Through the technical scheme, compared with the prior art, the six-cavity four-zero-point ceramic waveguide filter provided by the invention has the advantages that two capacitive CQ coupling units are formed under the condition of not increasing the number of cavities by sharing the second resonant cavity and the fifth resonant cavity and the negative coupling blind hole between the second resonant cavity and the fifth resonant cavity, and two pairs of transmission zeros are generated; and a rectangular groove is introduced at the diagonal joint of the CQ unit to form diagonal coupling, so that the positions of two pairs of transmission zero points are effectively adjusted, the symmetry of a transmission curve is improved, and the CQ unit has the characteristics of small volume, light weight, high out-of-band rejection and the like.
Drawings
Fig. 1 is a topology structural diagram of a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics according to embodiment 1 of the present invention.
Fig. 2 is a schematic three-dimensional structural diagram of a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics according to embodiment 1 of the present invention.
Fig. 3 is a schematic top surface structure diagram of a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics according to embodiment 1 of the present invention.
Fig. 4 is a schematic view of a lower surface structure of a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics according to embodiment 1 of the present invention.
Fig. 5 is a graph comparing the out-of-band rejection characteristics of the six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics provided in embodiment 1 of the present invention with those of the ceramic waveguide filter of the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic, which comprises a ceramic filter body with a conductive metal coating on the outer surface, wherein the ceramic filter body is made of dielectric materials, the ceramic filter body is provided with a tuning hole, a coupling groove and a capacitive coupling structure, the coupling groove is a rectangular groove, the capacitive coupling structure is a negative coupling blind hole, and the lower surface is provided with an input/output port.
Example 1
As shown in fig. 1 to 5, in one embodiment of the present invention, a six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics is provided, which includes a ceramic waveguide filter body 1 with a metal coating on the surface, a tuning hole on the upper surface of the body, a coupling slot and a capacitive coupling structure. Six tuning holes are arranged on the upper surface of the ceramic filter body and are respectively 31, 32, 33, 34, 35 and 36, the tuning holes are blind holes, the tuning holes and part of the body independently form a resonant cavity to form six resonant cavities, and the resonant frequency of the resonant cavity can be adjusted by adjusting the depth of the blind holes. The ceramic waveguide filter body 1 is provided with a through coupling slot, the coupling slot is a rectangular slot with a set length, width and height, and the rectangular slot is positioned at the connection position between the resonant cavities to realize the inductive coupling between the cavities, which is respectively 21, 22, 23, 24, 25 and 26. And a capacitive coupling structure 41 is also arranged between the second resonant cavity and the fifth resonant cavity, and the capacitive coupling structure 41 is a negative coupling blind hole. The first, second, fifth and sixth resonant cavities and the coupling structures among the cavities jointly form a first capacitive coupling CQ unit, and the second, third, fourth and fifth resonant cavities and the coupling structures among the cavities jointly form a second capacitive coupling CQ unit. Coupling grooves 42 are formed at the joints of the first and the five resonant cavities or the joints of the second and the six resonant cavities to realize diagonal coupling of the first CQ unit; coupling slots 43 are further provided at the junctions of the second and fourth resonators or the third and fifth resonators for realizing the diagonal coupling of the second CQ unit. The lower surface of the ceramic filter body is also provided with an input port 51 and an output port 52 for realizing input and output of signals. The transmission characteristic contrast curve of the six-cavity four-zero filter and the six-cavity double-zero filter with a single CQ structure and the eight-cavity four-zero filter with a double CQ structure in the prior art is shown in fig. 5.
As a specific implementation manner, the filter shares the second and fifth resonant cavities and the capacitive coupling structure between the cavities, and two capacitively coupled CQ units are introduced into the six-cavity filter to generate two pairs of transmission zeros, which are respectively used to adjust the out-of-band rejection at the near end and the far end of the filter.
As a specific implementation manner, the diagonal coupling of the first CQ unit and the second CQ unit is used to optimally adjust the positions of the two pairs of transmission zeros, improve the symmetry of the filter curve, and enhance the out-of-band rejection characteristic of the filter.
As a specific implementation mode, compared with the existing six-cavity double-zero ceramic waveguide filter with a single CQ structure, the six-cavity four-zero ceramic waveguide filter has a higher out-of-band rejection characteristic; compared with the existing eight-cavity four-zero-point ceramic waveguide filter with a double CQ structure, the filter has slightly poor out-of-band rejection characteristics, smaller volume and lighter weight.
Claims (8)
1. Six chamber four zero point ceramic waveguide filters of high outband rejection characteristic which characterized in that: the ceramic filter body is made of dielectric materials, the body is provided with a tuning hole, a coupling groove and a capacitive coupling structure, the coupling groove is a rectangular groove, the capacitive coupling structure is a negative coupling blind hole, and the lower surface of the capacitive coupling structure is provided with an input/output port.
2. The six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics of claim 1, wherein: six tuning holes are formed in the upper surface of the ceramic waveguide filter body, the tuning holes and part of the ceramic waveguide filter body independently form a resonant cavity, the resonant cavity comprises six resonant cavities, and the tuning holes are blind holes and used for adjusting the resonant frequency of the cavity.
3. The six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics of claim 1, wherein: the coupling slot is positioned at the joint of the resonant cavities and used for realizing inductive coupling.
4. The six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristics of claim 1, wherein: and the negative coupling blind hole is positioned at the joint of the second resonant cavity and the fifth resonant cavity and is used for realizing capacitive coupling.
5. The six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection characteristics as claimed in claim 1\2\3\4, wherein: the first, second, fifth and sixth resonant cavities and coupling structures among the cavities jointly form a first capacitive coupling CQ unit, and the second, third, fourth and fifth resonant cavities and coupling structures among the cavities jointly form a second capacitive coupling CQ unit.
6. The six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection characteristics as claimed in claim 1\2\3\4\5, wherein: the junction of the first resonant cavity and the fifth resonant cavity or the junction of the second resonant cavity and the sixth resonant cavity is provided with a rectangular groove for realizing diagonal coupling of the first CQ unit.
7. The six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection characteristics as claimed in claim 1\2\3\4\5, wherein: and a rectangular groove is formed at the joint of the second resonant cavity and the fourth resonant cavity or the joint of the third resonant cavity and the fifth resonant cavity, so that the diagonal coupling of the second CQ unit is realized.
8. The six-cavity four-zero-point ceramic waveguide filter with high out-of-band rejection characteristics of claim 5\6\7, wherein: the coupling amount of diagonal coupling can be adjusted by changing the length of the coupling groove at the diagonal connection part in the CQ unit, so that the position of a transmission zero point can be adjusted.
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| CN202110265435.9A CN112952327A (en) | 2021-03-11 | 2021-03-11 | Six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic |
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| CN202110265435.9A CN112952327A (en) | 2021-03-11 | 2021-03-11 | Six-cavity four-zero ceramic waveguide filter with high out-of-band rejection characteristic |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2036305A1 (en) * | 1990-02-14 | 1991-08-15 | Tomokazu Komazaki | Dielectric filter having coupling amount adjusting patterns |
| US20080231391A1 (en) * | 2005-09-20 | 2008-09-25 | Tdk Corporation | Dielectric device |
| CN210040477U (en) * | 2019-08-28 | 2020-02-07 | 中兴通讯股份有限公司 | Cross coupling filter |
| CN111668580A (en) * | 2020-06-09 | 2020-09-15 | 江苏贝孚德通讯科技股份有限公司 | Dielectric filter with steep out-of-band rejection and antenna |
| CN112038735A (en) * | 2020-08-04 | 2020-12-04 | 华中科技大学 | Ceramic filter with double-blind-groove capacitive coupling structure |
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2021
- 2021-03-11 CN CN202110265435.9A patent/CN112952327A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2036305A1 (en) * | 1990-02-14 | 1991-08-15 | Tomokazu Komazaki | Dielectric filter having coupling amount adjusting patterns |
| US20080231391A1 (en) * | 2005-09-20 | 2008-09-25 | Tdk Corporation | Dielectric device |
| CN210040477U (en) * | 2019-08-28 | 2020-02-07 | 中兴通讯股份有限公司 | Cross coupling filter |
| CN111668580A (en) * | 2020-06-09 | 2020-09-15 | 江苏贝孚德通讯科技股份有限公司 | Dielectric filter with steep out-of-band rejection and antenna |
| CN112038735A (en) * | 2020-08-04 | 2020-12-04 | 华中科技大学 | Ceramic filter with double-blind-groove capacitive coupling structure |
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Application publication date: 20210611 |