CN113571851B - Monomer multichannel filtering switch - Google Patents
Monomer multichannel filtering switch Download PDFInfo
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- CN113571851B CN113571851B CN202110668595.8A CN202110668595A CN113571851B CN 113571851 B CN113571851 B CN 113571851B CN 202110668595 A CN202110668595 A CN 202110668595A CN 113571851 B CN113571851 B CN 113571851B
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- coaxial
- resonators
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- dielectric resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/10—Auxiliary devices for switching or interrupting
- H01P1/12—Auxiliary devices for switching or interrupting by mechanical chopper
- H01P1/125—Coaxial switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/10—Auxiliary devices for switching or interrupting
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/202—Coaxial filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/04—Coaxial resonators
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- 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
- H01P7/105—Multimode resonators
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Abstract
The invention discloses a single multi-path filtering switch. Comprises at least one multimode dielectric resonator and two coaxial resonators; the switch circuit is connected with the coaxial resonators respectively, and on-off states are formed between the switch circuit and the coaxial resonators; coupling pieces which are mutually coupled with the multimode dielectric resonators are arranged on the coaxial resonators, and each coaxial resonator is respectively coupled with only one mode of the multimode dielectric resonators through the corresponding coupling piece to form a plurality of filters. The invention integrates the multi-path filter switch through the common multimode dielectric resonator in one structure, reduces the volume and realizes high integration.
Description
Technical Field
The invention relates to a filtering switch, in particular to a single multi-channel filtering switch, and belongs to the technical field of wireless communication.
Background
With the development of wireless technology, the scale of wireless systems is larger and larger, and the number of wireless radio frequency channels is greatly increased, for example, the number of radio frequency channels in a 5G large-scale multiple-input multiple-output (MIMO) system can reach dozens and hundreds. The filter and the switch are important components of the radio frequency front end, and the number of the filters and the switch is greatly increased along with the increase of the number of radio frequency channels, so that the problem of difficult integration of a system is brought. In addition, the cascade connection of the filter and the switch brings about the problems of large loss and stage mismatch, which leads to the reduction of the overall efficiency of the system.
Dielectric resonators and coaxial resonators have a large number of applications in base stations due to high Q values and high power tolerances, and domestic and foreign scholars develop more filter researches based on dielectric resonators or coaxial resonators to achieve better performance, but most of the dielectric resonators and the coaxial resonators adopt single-mode or dual-mode resonators, the size can be further reduced, and integration among a plurality of filters is less researched. For the problems of loss and impedance mismatch existing in the cascade connection of a switch and a filter in a system, a scholars provides a method for realizing the fusion design of the filter and the switch to realize the filtering switch, but most of the filters adopt a PCB (printed Circuit Board) process, the Q value and the power tolerance are low, and the application requirements of a base station are difficult to meet. In addition, the existing filter switches are all designed in a single circuit, and the design of integrating two filter switches in a single circuit is not described in relevant records.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a single multi-path filter switch, which can realize a multi-path filter switch circuit, reduce the size of the circuit, realize integration and realize good isolation between two paths.
The purpose of the invention can be achieved by adopting the following technical scheme: a monomer multipath filtering switch comprises at least one multimode dielectric resonator and two coaxial resonators;
the switch circuit is connected with the coaxial resonators respectively, and on-off states are formed between the switch circuit and the coaxial resonators;
coupling pieces which are mutually coupled with the multimode dielectric resonators are arranged on the coaxial resonators, and each coaxial resonator is respectively coupled with only one mode of the multimode dielectric resonators through the corresponding coupling piece to form a plurality of filters.
Furthermore, the coaxial resonators are respectively connected with external ports, and the external quality factor of the filter is controlled by adjusting the positions of the connection points of the coaxial resonators and the ports.
Further, the coupling piece arranged on the coaxial resonator is parallel to the multimode dielectric resonator and close to the multimode dielectric resonator;
the position of the coupling parts of the coaxial resonators is arranged in a mode that the coaxial resonators can respectively excite different modes of the multimode dielectric resonator without mutual influence.
Furthermore, the dielectric resonator is a cylinder, a cuboid, a cube or a sphere, and metal screws are arranged on the periphery of the dielectric resonator and used for finely adjusting the resonant frequency of the multimode dielectric resonator.
Further, the coaxial resonators are symmetrically arranged on the side face of the multimode dielectric resonator.
Furthermore, a plurality of metal cavities are arranged, and the multimode dielectric resonator and the coaxial resonator are respectively arranged in the corresponding metal cavities.
Furthermore, each switch circuit is respectively arranged on the PCB.
The invention has the advantages that: the invention discloses a monomer multi-channel filter switch, wherein the whole circuit at least comprises a multi-mode dielectric resonator and two coaxial resonators; the multimode dielectric resonator at least comprises a pair of orthogonal degenerate modes; coupling probes are arranged on the coaxial resonators and are coupled with the multimode dielectric resonators, wherein the coupling probes are divided into two groups, and each group of probes is only coupled with one mode of each pair of orthogonal degenerate modes, so that two paths of filters which are not influenced mutually are obtained; in addition, each coaxial resonator is connected with the switch circuit, and the resonant frequency of the coaxial resonators is changed by controlling the switch circuit, so that the on and off of the two filters are realized, and the single multi-path filtering switch is obtained. The invention integrates the multi-path filter switch through the common multimode dielectric resonator in one structure, reduces the volume and realizes high integration.
Drawings
Fig. 1 is a schematic structural diagram of a single multipath filtering switch according to an embodiment of the present invention.
Fig. 2 shows the results of the on state of the single-cell multi-pass filter switch according to an embodiment of the present invention.
Fig. 3 shows the results of the single-body multi-pass filter switch of the embodiment of the present invention in the off state.
Detailed Description
A monomer multipath filtering switch comprises at least one multimode dielectric resonator and two coaxial resonators;
the switch circuit is connected with the coaxial resonators respectively, and on-off states are formed between the switch circuit and the coaxial resonators;
coupling pieces which are mutually coupled with the multimode dielectric resonators are arranged on the coaxial resonators, and each coaxial resonator is respectively coupled with only one mode of the multimode dielectric resonators through the corresponding coupling piece to form a plurality of filters.
Furthermore, the coaxial resonators are respectively externally connected with ports, and the external quality factors of the filter are controlled by adjusting the positions of the connection points of the coaxial resonators and the ports.
Further, the coupling piece arranged on the coaxial resonator is parallel to the multimode dielectric resonator and close to the multimode dielectric resonator;
the position of each coaxial resonator coupling piece is arranged in a way that the coaxial resonators can respectively excite different modes of the multimode dielectric resonator without mutual influence.
Furthermore, the dielectric resonator is a cylinder, a cuboid, a cube or a sphere, and metal screws are arranged on the periphery of the dielectric resonator and used for finely adjusting the resonant frequency of the multimode dielectric resonator.
Further, the coaxial resonators are symmetrically arranged on the side faces of the multimode dielectric resonator.
Furthermore, a plurality of metal cavities are arranged, and the multimode dielectric resonator and the coaxial resonator are respectively arranged in the corresponding metal cavities.
Further, each switch circuit is arranged on the PCB respectively.
The invention is further described below for better clarity:
the embodiment is as follows: fig. 1 shows a single multi-channel filter switch, which includes five metal cavities, namely a first metal cavity 10, a second metal cavity 11, a third metal cavity 12, a fourth metal cavity 13, and a fifth metal cavity 14; four coaxial resonators and a four-mode dielectric resonator are sequentially arranged in the five metal cavities, namely a first 1 coaxial resonator, a second 2 coaxial resonator, a third 3 coaxial resonator, a fourth 4 coaxial resonator and a dielectric resonator 5;
the first, second, third and fourth metal cavities are internally provided with a first PCB, a second PCB, a third PCB and a fourth PCB in sequence, each PCB is provided with a switch circuit which is respectively connected with the first, second, third and fourth coaxial resonators and used for regulating and controlling the coaxial resonators to resonate at different resonant frequencies in the on and off states;
the first, second, third and fourth coaxial resonators are respectively connected with the first 6, second 7, third 8 and fourth 9 ports, and the external quality factor of the filter is controlled by adjusting the positions of the connection points of the resonators and the ports;
the four coaxial resonators are respectively provided with a coupling metal rod mutually coupled with the dielectric resonators, and the coupling metal rods of the first and second coaxial resonators are only coupled to two modes in the four-mode dielectric resonators to form a first filter; coupling metal rods of the third coaxial resonator and the fourth coaxial resonator are only coupled to the other two modes in the four-mode dielectric resonator to form a second filter; therefore, the whole structure comprises two filters, and the performances are hardly influenced by each other;
when the switch circuit is closed, the resonant frequency of the coaxial resonator in each filter is close to the resonant frequency of the four-mode dielectric resonator, and an on-state band-pass filtering response is formed; when the switch circuit is opened, the capacitance effect of the switch circuit is loaded on the coaxial resonator, and the resonant frequency of the coaxial resonator is changed, so that the difference between the resonant frequency of the coaxial resonator and the resonant frequency of the dielectric resonator is large, a band-pass filter cannot be formed, and the isolation effect of an off state is realized; therefore, the whole structure comprises two switchable filter pass bands, and a single multi-path filtering switch is realized.
The coupling probe arranged on the coaxial resonator is parallel to the dielectric resonator and is close to the dielectric resonator; by taking the horizontal central line of the dielectric resonator as a reference, the coupling metal rods arranged on the first coaxial resonator and the second coaxial resonator are positioned at the positions of 90 degrees of the coupling metal rods arranged on the third coaxial resonator and the fourth coaxial resonator, so that the first coaxial resonator and the second coaxial resonator and the third coaxial resonator and the fourth coaxial resonator can respectively excite two modes on the dielectric resonator without mutual influence, and the good isolation effect of the two-way filter is realized.
Fig. 2 and fig. 3 are graphs of experimental results of the single multipath filter switch of the present embodiment, and from fig. 2, when the single multipath filter switch is in an on state, good filtering performance is achieved, the center frequency of the passband is 2.56GHz, the in-band return loss is greater than 18dB, the bandwidth with the return loss greater than 18dB is 1.8%, and the simulated insertion loss is 0.4dB; the isolation of the two filter switch channels is better than 30 dB; it can be seen from fig. 3 that in the off state, the off isolation of each switch is greater than 25dB, and the isolation between the two switches is greater than 60dB. In general, each path of the single multi-path filter switch realizes a good filter switch effect, and good isolation is realized between the two paths.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the scope of the present invention.
Claims (6)
1. A single multi-channel filter switch is characterized by comprising at least one multi-mode dielectric resonator and two coaxial resonators;
the switch circuit is connected with the coaxial resonators respectively, and on-off states are formed between the switch circuit and the coaxial resonators;
coupling pieces which are mutually coupled with the multimode dielectric resonators are arranged on the coaxial resonators, and each coaxial resonator is respectively coupled with only one mode of the multimode dielectric resonators through the corresponding coupling piece to form a plurality of filters;
the coupling piece arranged on the coaxial resonator is parallel to the multimode dielectric resonator and close to the multimode dielectric resonator;
the position of the coupling parts of the coaxial resonators is arranged in a mode that the coaxial resonators can respectively excite different modes of the multimode dielectric resonator without mutual influence.
2. The single-body multipath filtering switch of claim 1, wherein the coaxial resonators are respectively externally connected with the ports, and the control of the external quality factor of the filter is realized by adjusting the positions of the connection points of the coaxial resonators and the ports.
3. The unitary multiway filter switch of claim 1, wherein the dielectric resonator is a cylinder, a cuboid, a cube or a sphere, and metal screws are disposed around the dielectric resonator for fine tuning the resonant frequency of the multimode dielectric resonator.
4. The monolithic multiway filter switch of claim 1, wherein the coaxial resonators are symmetrically disposed on the sides of the multimode dielectric resonator.
5. The single-body multipath filter switch of claim 1, wherein a plurality of metal cavities are provided, and the multimode dielectric resonator and the coaxial resonator are respectively provided in the corresponding metal cavities.
6. The simplex multipath filter switch of claim 1, wherein the switching circuits are disposed on a PCB board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110668595.8A CN113571851B (en) | 2021-06-16 | 2021-06-16 | Monomer multichannel filtering switch |
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| CN202110668595.8A CN113571851B (en) | 2021-06-16 | 2021-06-16 | Monomer multichannel filtering switch |
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| CN113571851A CN113571851A (en) | 2021-10-29 |
| CN113571851B true CN113571851B (en) | 2022-12-09 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039543A (en) * | 2017-12-14 | 2018-05-15 | 华南理工大学 | A kind of monomer two-way wave filter based on dielectric resonator |
| CN108417940A (en) * | 2018-04-08 | 2018-08-17 | 南通大学 | A kind of multiport model filters power splitter and its construction method based on dielectric resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114931A (en) * | 1995-12-19 | 2000-09-05 | Telefonaktiebolaget Lm Ericsson | Superconducting arrangement with non-orthogonal degenerate resonator modes |
| EP1450486A1 (en) * | 2003-02-20 | 2004-08-25 | TDK Corporation | Multi-Mode Filter |
| CN202103148U (en) * | 2011-05-20 | 2012-01-04 | 京信通信系统（中国）有限公司 | Coupling structure of dielectric resonator and coaxial cavity resonator |
| CN206313106U (en) * | 2016-12-20 | 2017-07-07 | 京信通信系统（中国）有限公司 | Hybrid guided mode radio-frequency filter |
| CN109768356B (en) * | 2019-01-16 | 2020-05-22 | 华南理工大学 | Miniature multimode filter switch based on cavity resonator |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039543A (en) * | 2017-12-14 | 2018-05-15 | 华南理工大学 | A kind of monomer two-way wave filter based on dielectric resonator |
| CN108417940A (en) * | 2018-04-08 | 2018-08-17 | 南通大学 | A kind of multiport model filters power splitter and its construction method based on dielectric resonator |
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Effective date of registration: 20221116 Address after: No. 18, Huanghai South Road, Xiannv Town, Jiangdu District, Yangzhou City, Jiangsu Province 225200 Applicant after: YANGZHOU JIANGJIA TECHNOLOGY Co.,Ltd. Applicant after: SOUTH CHINA University OF TECHNOLOGY Address before: 225200 No. 88, Gan Tang Road, Shabo Town, Jiangdu District, Yangzhou, Jiangsu Applicant before: JIANGSU JIANGJIA ELECTRONICS Co.,Ltd. Applicant before: SOUTH CHINA University OF TECHNOLOGY |
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