CN103152011B - A kind of SAW filter based on the horizontal balance type structure of leggy paraphase - Google Patents
A kind of SAW filter based on the horizontal balance type structure of leggy paraphase Download PDFInfo
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- CN103152011B CN103152011B CN201310080377.8A CN201310080377A CN103152011B CN 103152011 B CN103152011 B CN 103152011B CN 201310080377 A CN201310080377 A CN 201310080377A CN 103152011 B CN103152011 B CN 103152011B
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Abstract
The invention provides a kind of SAW filter based on the horizontal balance type structure of leggy paraphase, including substrate, input transducer and output transducer, described substrate is provided with the input transducer and output transducer intercoupled, described input transducer and output transducer are that structure symmetrical above and below is arranged, the lower channel of described input transducer and output transducer all moves the distance of half wavelength than upper channel to sound transmission direction, four groups of coupling electrode antisymmetry of described input transducer and the upper channel of output transducer and lower channel connect, and each coupling electrode is all controlled by a phase shifter.The invention provides a kind of unidirectional single-phase dual port technology, it is possible not only to be designed as balanced type wave filter, and can not weighting of the unidirectional single-phase technology of phase shift solving single port carries the deepest outer problem, eliminates common mode disturbances by symmetric design, has reached to improve the purpose of Out-of-band rejection.
Description
Technical field
The present invention relates to a kind of SAW filter based on the horizontal balance type structure of leggy paraphase, belong to surface acoustic wave filter
Wave technology field.
Background technology
In existing SPUDT (Single Phase Unidirectional Transducer, single phase unidirectional transducer) technology
In, there is the technology being controlled the unidirectional single-phase filter with low insertion loss of reality by phase-shift network, but be only limitted to single port system, it is impossible to be real
Existing unidirectional single-phase dual port technology.
Summary of the invention
The present invention solves the problem that cannot realize unidirectional single-phase dual-port that existing surface acoustic wave filtering technique exists, enter
And provide a kind of SAW filter based on the horizontal balance type structure of leggy paraphase.To this end, the invention provides as
Under technical scheme:
A kind of SAW filter based on the horizontal balance type structure of leggy paraphase, including substrate, input transducer and defeated
Going out transducer, described substrate is provided with the input transducer and output transducer intercoupled, described input transducer and output
Transducer be structure symmetrical above and below arrange, the lower channel of described input transducer and output transducer all than upper channel to the sound transmission
Four groups of coupling electricity of the distance of half wavelength, described input transducer and the upper channel of output transducer and lower channel are moved in direction
Pole antisymmetry connects, and each coupling electrode is all controlled by a phase shifter.
The invention provides a kind of unidirectional single-phase dual port technology, be possible not only to be designed as balanced type wave filter, and solve
The phase shift unidirectional single-phase technology of single port can not weight band the deepest outer problem, eliminate common mode by symmetric design and do
Disturb, reached to improve the purpose of Out-of-band rejection.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, in describing embodiment below, required use is attached
Figure is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for ability
From the point of view of the those of ordinary skill of territory, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is surface acoustic wave based on the horizontal balance type structure of the leggy paraphase filtering of the detailed description of the invention offer of the present invention
The structural representation of device；
Fig. 2 be the present invention detailed description of the invention provide upper channel or lower channel in coupling electrode schematic diagram is set；
Fig. 3 is the principle schematic of control of the single phase shifter coupling electrode of the detailed description of the invention offer of the present invention；
Fig. 4 is input transducer and the structural representation of output transducer connection of the detailed description of the invention offer of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
This detailed description of the invention provides a kind of SAW filter based on the horizontal balance type structure of leggy paraphase, such as figure
Shown in 1, including substrate 1, input transducer 2 and output transducer 3, substrate 1 is provided with input transducer 2 He intercoupled
Output transducer 3, input transducer 2 and output transducer 3 are that structure symmetrical above and below is arranged, input transducer 2 and output transducing
The lower channel of device 3 all moves the distance of half wavelength, input transducer 2 and output transducer 3 than upper channel to sound transmission direction
Upper channel and four groups of coupling electrode 4 antisymmetry of lower channel connect, and each coupling electrode 4 is all by a phase shifter 5
Control.
Preferably, the interdigital electrode in upper channel and lower channel is 1/12 wavelength structure, the phase shifter 5 traveling angle to phase place
Degree is 45 degree, and substrate 1 can use 112 ° of lithium tantanate substrates.
Concrete, the SAW filter based on the horizontal balance type structure of leggy paraphase of this detailed description of the invention offer
Ultimate principle is the unidirectional single-phase transmission that the passive paraphase by suspension electrode realizes electrode interior, and making uses
Modern microelectronic technology planar technology, in actual production, by the method for positive glue stripping technology, it is possible to ensure all 1/12
The precision of wavelength line thickness, finally achieves qualified products.
Wherein, the coupling electrode in upper channel or lower channel setting as in figure 2 it is shown, the phase shifter 5 of upper channel connect upper channel
Coupling electrode 4, the phase shifter 5 of lower channel connects the coupling electrode 4 of lower channel, and the coupling electrode 4 of upper channel and lower channel
Coupling electrode 4 between have the distance of half wavelength, the C in Fig. 2 represents the distance of a wavelength, and D represents 50 wavelength (sound
Aperture) distance.
As shown in Figure 3 and Figure 4, input IDT launches surface acoustic wave (SAW), and is output transducer acceptance, by so
The transformation process of acoustoelectric electroacoustic realize the filtering function of the signal of telecommunication.Two input and output form balance type structure, eliminate common mode
Interference, improves Out-of-band rejection.This detailed description of the invention provides a kind of leggy paraphase transversary according to technique scheme
SAW filter SAW filter, is divided into input and output IDT, uses and uniformly refers to technology, is effectively improved outside the band of device
Suppression.
Use the technical scheme that this detailed description of the invention provides, it is provided that a kind of unidirectional single-phase dual port technology, be possible not only to
It is designed as balanced type wave filter, and can not weighting of the unidirectional single-phase technology of phase shift solving single port carries the deepest outer asking
Topic, eliminates common mode disturbances by symmetric design, has reached to improve the purpose of Out-of-band rejection.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, and appoints
What those familiar with the art in the technical scope that the embodiment of the present invention discloses, the change that can readily occur in or replace
Change, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection of claim
Scope is as the criterion.
Claims (4)
1. a SAW filter based on the horizontal balance type structure of leggy paraphase, including substrate, input transducer
And output transducer, described substrate is provided with the input transducer and output transducer intercoupled, it is characterised in that described
Input transducer and output transducer are that structure symmetrical above and below is arranged, and the lower channel of described input transducer and output transducer is equal
Move the distance of half wavelength to sound transmission direction than upper channel, the upper channel of described input transducer and output transducer and under
Four groups of coupling electrode antisymmetry of passage connect, and each coupling electrode is all controlled by a phase shifter.
SAW filter based on the horizontal balance type structure of leggy paraphase the most according to claim 1, its feature
Being, the interdigital electrode in described upper channel and lower channel is 1/12 wavelength structure.
SAW filter based on the horizontal balance type structure of leggy paraphase the most according to claim 1, its feature
Being, the described phase shifter is 45 degree to the move angle of phase place.
SAW filter based on the horizontal balance type structure of leggy paraphase the most according to claim 1, its feature
Being, described substrate is 112 ° of lithium tantanate substrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080377.8A CN103152011B (en) | 2013-03-14 | 2013-03-14 | A kind of SAW filter based on the horizontal balance type structure of leggy paraphase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080377.8A CN103152011B (en) | 2013-03-14 | 2013-03-14 | A kind of SAW filter based on the horizontal balance type structure of leggy paraphase |
Publications (2)
| Publication Number | Publication Date |
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| CN103152011A CN103152011A (en) | 2013-06-12 |
| CN103152011B true CN103152011B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310080377.8A Active CN103152011B (en) | 2013-03-14 | 2013-03-14 | A kind of SAW filter based on the horizontal balance type structure of leggy paraphase |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092569A (en) * | 1992-12-31 | 1994-09-21 | 莫托罗拉公司 | Multi-bandwidth saw filter |
| CN1141697A (en) * | 1993-12-02 | 1997-01-29 | 北方电讯有限公司 | Double mode surface wave resonators |
| CN101465629A (en) * | 2009-01-09 | 2009-06-24 | 北京中讯四方科技有限公司 | SF14003 type surface acoustic wave filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3780408B2 (en) * | 2001-01-26 | 2006-05-31 | 株式会社村田製作所 | Surface acoustic wave filter device |
| JP5776243B2 (en) * | 2011-03-18 | 2015-09-09 | 日本電波工業株式会社 | Elastic wave filter |
-
2013
- 2013-03-14 CN CN201310080377.8A patent/CN103152011B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092569A (en) * | 1992-12-31 | 1994-09-21 | 莫托罗拉公司 | Multi-bandwidth saw filter |
| CN1141697A (en) * | 1993-12-02 | 1997-01-29 | 北方电讯有限公司 | Double mode surface wave resonators |
| CN101465629A (en) * | 2009-01-09 | 2009-06-24 | 北京中讯四方科技有限公司 | SF14003 type surface acoustic wave filter |
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| Publication number | Publication date |
|---|---|
| CN103152011A (en) | 2013-06-12 |
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