CN112511124A - Grounding structure and filter for improving out-of-band rejection of DMS type receiving filter - Google Patents
Grounding structure and filter for improving out-of-band rejection of DMS type receiving filter Download PDFInfo
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- CN112511124A CN112511124A CN202110166391.4A CN202110166391A CN112511124A CN 112511124 A CN112511124 A CN 112511124A CN 202110166391 A CN202110166391 A CN 202110166391A CN 112511124 A CN112511124 A CN 112511124A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
Abstract
The invention relates to a surface acoustic wave filter, in particular to a grounding structure and a filter for improving out-of-band rejection of a DMS type receiving filter, wherein the DMS structure comprises a fifth-order resonance structure and two reflecting grids, the first reflecting grid is connected with the ground pole of a part of the resonance structure, the second reflecting grid is connected with the ground pole of the part of the resonance structure, and other resonance structures are independently grounded; or the first reflection grating and the second reflection grating are grounded in common and are connected with the ground pole of the partial resonance structure, other resonance structures are grounded independently, and potential difference is formed between ground signals, so that the passband performance can be ensured, and out-of-band rejection can be improved.
Description
Technical Field
The invention belongs to a surface acoustic wave filter, and particularly relates to a grounding structure and a filter for improving out-of-band rejection of a DMS (digital distribution system) type receiving filter.
Background
Acoustic surface filters are designed primarily with a ladder structure and DMS-type filters, which perform well in terms of low-end rejection and volume, and are therefore widely used in filter design. On the premise of ensuring the passband performance, good out-of-band rejection is required, and it is important to improve the service performance of the filter, improve the out-of-band rejection and ensure the passband performance.
Disclosure of Invention
The present invention provides a grounding structure for improving the out-of-band rejection of a DMS-type receive filter, to solve the above problems: the DMS structure comprises a fifth-order resonance structure and two reflecting grids, the first reflecting grid is connected with the ground pole of the partial resonance structure, the second reflecting grid is connected with the ground pole of the partial resonance structure, and other resonance structures are independently grounded; or the first reflecting grating and the second reflecting grating are grounded in common and are connected with the ground of part of the resonant structures, and the other resonant structures are grounded separately.
Preferably, the first reflective grating is connected to a second-order resonant structure ground, and the second reflective grating is connected to a fifth-order resonant structure ground.
Preferably, the first reflective grating is connected with the second-order resonant structure ground and the fourth-order resonant structure ground, and the second reflective grating is connected with the third-order resonant structure ground and the fifth-order resonant structure ground.
Preferably, the first and second reflective gratings are connected to each other and to the first-order resonant structure ground.
Preferably, the first reflective grating and the second reflective grating are connected and are connected to a ground of the second order resonant structure.
Preferably, the first reflective grating and the second reflective grating are connected to each other and are connected to the first-order resonant structure ground, the third-order resonant structure ground and the fifth-order resonant structure ground.
Preferably, the first reflective grating and the second reflective grating are connected to each other, and are connected to the second-order resonant structure ground and the fourth-order resonant structure ground.
The invention also provides a filter comprising any one of the above-mentioned grounding structures for improving the out-of-band rejection of a DMS-type reception filter, further comprising three series resonators and a parallel resonator, the parallel resonator being connected in parallel between the first series resonator and the second series resonator, the DMS structure being arranged between the second series resonator and the third series resonator.
The invention has the following beneficial effects: the grounding structure for improving the out-of-band rejection of the DMS type receiving filter is provided, a first reflection grid and a second reflection grid are respectively connected with the ground poles of partial resonance structures and then are commonly grounded by changing the grounding position of the DMS structure, or the first reflection grid and the second reflection grid are commonly grounded and are commonly grounded after being connected with the ground poles of the partial resonance structures, other resonance structures are independently grounded, and potential difference is formed between ground signals, so that the passband performance can be ensured, and the out-of-band rejection can be improved.
Drawings
Figure 1 is a prior art grounding configuration for a DMS-type receive filter;
FIG. 2 is a schematic diagram of the first reflective grating and the second-order resonant structure ground, and the second reflective grating and the fifth-order resonant structure ground are connected to the common ground according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of the embodiment of the present invention in which the first reflective grating is connected to the ground of the second-order resonant structure and the fourth-order resonant structure, and the second reflective grating is connected to the ground of the third-order resonant structure and the fifth-order resonant structure to be grounded;
FIG. 4 is a schematic diagram of a first reflective grating and a second reflective grating connected together and commonly grounded with a ground connection of a first-order resonant structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the first reflective grating and the second reflective grating connected together and grounded together with the ground connection of the second-order resonant structure in the embodiment of the present invention;
FIG. 6 is a schematic diagram of the first reflective grating and the second reflective grating connected to each other and connected to the ground of the first-order resonant structure, the third-order resonant structure, and the fifth-order resonant structure to be grounded together according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of the first reflective grating and the second reflective grating connected together and connected to the ground of the second-order resonant structure and the fourth-order resonant structure to be grounded together according to the embodiment of the present invention;
FIG. 8 is a diagram illustrating simulation results of S-parameters of the structure shown in FIGS. 1 and 2;
FIG. 9 is a diagram illustrating simulation results of S parameters of the structure shown in FIGS. 1 and 4;
fig. 10 is a schematic diagram of a simulation result of the structure S parameter in the embodiment shown in fig. 1 and 6.
1-a first reflective grating; 2-a second reflective grating; 3-first order resonant structure; 4-second order resonant structure; 5-third order resonance structure; 6-fourth order resonant structure; 7-fifth order resonant structure; 8-a first series resonator; 9-a second series resonator; 10-a third series resonator; 11-parallel resonator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1-10, a grounding structure for improving out-of-band rejection of a DMS-type receiving filter, the DMS structure includes a fifth-order resonant structure and two reflective gratings, a first reflective grating 1 is connected to a ground of a partial resonant structure, a second reflective grating 2 is connected to a ground of a partial resonant structure, and other resonant structures are grounded separately; or the first reflecting grating 1 and the second reflecting grating 2 are connected with the ground of the partial resonance structure in common and the other resonance structures are separately grounded.
The five-order resonance structure is arranged in sequence, the two reflection grids are respectively arranged at two ends of the resonance structure queue, the first reflection grid 1 and the first-order resonance structure 3 are respectively connected with the ground poles of the partial resonance structure to be commonly grounded or the first reflection grid 1 and the first-order resonance structure 3 are connected and then connected with the ground poles of the partial resonance structure to be commonly grounded, potential difference is formed between signals, and inductance value effect between the ground signals is changed, so that the influence of parasitic inductance is improved, the high-frequency suppression effect is effectively improved, and the passband performance is not influenced.
Preferably, the first reflective grating 1 is connected to the ground of the second order resonant structure 4, and the second reflective grating 2 is connected to the ground of the fifth order resonant structure 7.
Preferably, the first reflective grating 1 is connected to the second-order resonant structure 4 ground and the fourth-order resonant structure 6 ground, and the second reflective grating 2 is connected to the third-order resonant structure 5 ground and the fifth-order resonant structure 7 ground.
Preferably, the first reflective grating 1 and the second reflective grating 2 are connected to each other and to the ground of the first-order resonant structure 3.
Preferably, the first reflective grating 1 and the second reflective grating 2 are connected to each other and to the ground of the second order resonant structure 4.
Preferably, the first reflective grating 1 and the second reflective grating 2 are connected to each other and are connected to the ground of the first-order resonant structure 3, the ground of the third-order resonant structure 5, and the ground of the fifth-order resonant structure 7.
Preferably, the first reflective grating 1 and the second reflective grating 2 are connected to each other, and are connected to the ground of the second-order resonant structure 4 and the ground of the fourth-order resonant structure 6.
Curve a represents the simulation result of the S-parameters of the DMS ground structure in fig. 1, curve B represents the simulation result of the S-parameters of the DMS ground structure in fig. 2, curve C represents the simulation result of the S-parameters of the DMS ground structure in fig. 4, and curve D represents the simulation result of the S-parameters of the DMS ground structure in fig. 6.
The invention also provides a filter comprising any of the above-mentioned grounding structures for improving the out-of-band rejection of a DMS-type reception filter, further comprising three series resonators and a parallel resonator 11, the parallel resonator 11 being connected in parallel between the first series resonator 8 and the second series resonator 9, the DMS structure being arranged between the second series resonator 9 and the third series resonator 10.
Aiming at a surface acoustic wave filter of a GPS frequency band, in the prior art, odd number and even number of ground poles in 5 resonance structures in the DMS are respectively connected to form odd number common ground and even number common ground, and a reflection grating and the resonance structure are partially common ground to form potential difference between ground signals so as to enhance out-of-band suppression, improve the steepness to a certain extent and ensure the passband characteristic; as shown in fig. 8, compared with the conventional DMS grounding structure for GPS band shown in fig. 1, the first reflecting grating 1 is connected to the ground of the second-order resonant structure 4, and the second reflecting grating 2 is connected to the ground of the fifth-order resonant structure 7, so that the out-of-band rejection is enhanced by about 6dB, the zero point on both sides of the passband is lower, the passband characteristic is not affected, and the rejection effect is more prominent in the high frequency band; as shown in fig. 9, compared to the conventional DMS grounding structure for GPS band shown in fig. 1, connecting the first reflecting grating 1 and the second reflecting grating 2 and connecting them to the ground of the first-order resonant structure 3, the out-of-band rejection effect is enhanced by about 4dB, and the rejection effect is more prominent in the high frequency band; as shown in fig. 10, compared to the conventional DMS grounding structure for the GPS band shown in fig. 1, when the first reflection gate 1 is connected to the second reflection gate 2 and commonly grounded to the ground of the first-order resonant structure 3, the third-order resonant structure 5, and the fifth-order resonant structure 7, the out-of-band rejection effect is enhanced by about 12dB, and the rejection effect is more prominent in the low frequency band and the steepness thereof is also increased.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and those skilled in the art should make various changes, modifications, alterations, and substitutions on the technical solution of the present invention without departing from the spirit of the present invention, which falls within the protection scope defined by the claims of the present invention.
Claims (8)
1. Ground structure for improving the out-of-band rejection of a DMS-type reception filter, characterized in that: the DMS structure comprises a fifth-order resonance structure and two reflecting grids, the first reflecting grid is connected with the ground pole of the partial resonance structure, the second reflecting grid is connected with the ground pole of the partial resonance structure, and other resonance structures are independently grounded; or the first reflecting grating and the second reflecting grating are grounded in common and are connected with the ground of part of the resonant structures, and the other resonant structures are grounded separately.
2. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflection grating is connected with the second-order resonant structure ground, and the second reflection grating is connected with the fifth-order resonant structure ground.
3. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflecting grating is connected with the second-order resonance structure earth pole and the fourth-order resonance structure earth pole, and the second reflecting grating is connected with the third-order resonance structure earth pole and the fifth-order resonance structure earth pole.
4. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflecting grating and the second reflecting grating are connected and are connected with the first-order resonant structure ground.
5. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflecting grating and the second reflecting grating are connected and are connected with the second-order resonant structure ground.
6. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflecting grating and the second reflecting grating are connected and are connected with the first-order resonance structure ground pole, the third-order resonance structure ground pole and the fifth-order resonance structure ground pole.
7. The ground structure for improving DMS-type receive filter out-of-band rejection of claim 1, wherein: the first reflection grating and the second reflection grating are connected and are connected with the second-order resonance structure ground pole and the fourth-order resonance structure ground pole.
8. A filter, characterized by: comprising a grounding structure for improving the out-of-band rejection of a DMS-type reception filter as claimed in any one of claims 1 to 7, further comprising three series resonators and a parallel resonator, said parallel resonator being connected in parallel between the first series resonator and the second series resonator, the DMS structure being arranged between the second series resonator and the third series resonator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110166391.4A CN112511124A (en) | 2021-02-07 | 2021-02-07 | Grounding structure and filter for improving out-of-band rejection of DMS type receiving filter |
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| CN202110166391.4A CN112511124A (en) | 2021-02-07 | 2021-02-07 | Grounding structure and filter for improving out-of-band rejection of DMS type receiving filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116015245A (en) * | 2023-03-27 | 2023-04-25 | 成都频岢微电子有限公司 | Duplexer device |
| CN116032246A (en) * | 2023-03-27 | 2023-04-28 | 成都频岢微电子有限公司 | Duplexer |
| CN117097298A (en) * | 2023-10-19 | 2023-11-21 | 苏州声芯电子科技有限公司 | Filter circuit for improving out-of-band rejection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141697A (en) * | 1993-12-02 | 1997-01-29 | 北方电讯有限公司 | Double mode surface wave resonators |
| US20100045399A1 (en) * | 2007-05-22 | 2010-02-25 | Murata Manufacturing Co., Ltd. | Balanced acoustic wave filter device and composite filter |
| CN101821945A (en) * | 2007-10-17 | 2010-09-01 | 株式会社村田制作所 | Balanced surface acoustic wave filter device and composite filter |
| CN108631746A (en) * | 2018-04-12 | 2018-10-09 | 无锡市好达电子有限公司 | A kind of SAW filter |
| CN112134541A (en) * | 2020-09-24 | 2020-12-25 | 成都频岢微电子有限公司 | Novel broadband acoustic surface filter |
-
2021
- 2021-02-07 CN CN202110166391.4A patent/CN112511124A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141697A (en) * | 1993-12-02 | 1997-01-29 | 北方电讯有限公司 | Double mode surface wave resonators |
| US20100045399A1 (en) * | 2007-05-22 | 2010-02-25 | Murata Manufacturing Co., Ltd. | Balanced acoustic wave filter device and composite filter |
| CN101821945A (en) * | 2007-10-17 | 2010-09-01 | 株式会社村田制作所 | Balanced surface acoustic wave filter device and composite filter |
| CN108631746A (en) * | 2018-04-12 | 2018-10-09 | 无锡市好达电子有限公司 | A kind of SAW filter |
| CN112134541A (en) * | 2020-09-24 | 2020-12-25 | 成都频岢微电子有限公司 | Novel broadband acoustic surface filter |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116015245A (en) * | 2023-03-27 | 2023-04-25 | 成都频岢微电子有限公司 | Duplexer device |
| CN116032246A (en) * | 2023-03-27 | 2023-04-28 | 成都频岢微电子有限公司 | Duplexer |
| CN116015245B (en) * | 2023-03-27 | 2023-05-30 | 成都频岢微电子有限公司 | Duplexer device |
| CN116032246B (en) * | 2023-03-27 | 2023-10-31 | 成都频岢微电子有限公司 | Duplexer |
| CN117097298A (en) * | 2023-10-19 | 2023-11-21 | 苏州声芯电子科技有限公司 | Filter circuit for improving out-of-band rejection |
| CN117097298B (en) * | 2023-10-19 | 2024-02-09 | 苏州声芯电子科技有限公司 | Filter circuit for improving out-of-band rejection |
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