CN204131476U - Surface acoustic wave filter - Google Patents
Surface acoustic wave filter Download PDFInfo
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- CN204131476U CN204131476U CN201420466342.8U CN201420466342U CN204131476U CN 204131476 U CN204131476 U CN 204131476U CN 201420466342 U CN201420466342 U CN 201420466342U CN 204131476 U CN204131476 U CN 204131476U
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Abstract
Surface Acoustic Wave Filter, comprise the first input interdigital transducer, first output interdigital transducer, second input interdigital transducer and the second interdigital output transducer, first input interdigital transducer and the first output interdigital transducer with the use of, second input interdigital transducer and the second interdigital output transducer with the use of, first input interdigital transducer and the second input interdigital transducer Longitudinal data Structural assignments are on substrate, first output interdigital transducer and the second interdigital output transducer Longitudinal data Structural assignments are on substrate, the input electrode of the first input interdigital transducer is connected with the input pad of base respectively by lead-in wire with the input electrode of the second input interdigital transducer, the output electrode of the first output interdigital transducer is connected with the o pads of base respectively by lead-in wire with the output electrode of the second interdigital output transducer.When ensureing Surface Acoustic Wave Filter filter with low insertion loss, the relative bandwidth adding device simultaneously structure is simply easy to produce.
Description
Technical field
The utility model relates to Surface Acoustic Wave Filter, belongs to technical field of electronic components.
Background technology
SAW (Surface Acoustic Wave) filter is that one piece of material base with piezoelectric effect evaporates layer of metal film, then makes through photoetching process the metal electrode that two groups have the interdigital of power conversion function, is called input interdigital transducer and output interdigital transducer.When inputting interdigital transducer and connecting ac voltage signal, the surface of piezoelectric crystal substrate just produces vibration, and inspire the sound wave with external signal same frequency, the direction that this sound wave mainly rises along the surface of substrate and interdigital electrode is propagated, the sound wave in one of them direction is absorbed by sound-absorbing material, and the sound wave in another direction is then transferred to output interdigital transducer and is converted into signal of telecommunication output.Acoustic current surface wave filter is according to the difference of material, and relative bandwidth, generally in the scope of 1%-6%, if will increase relative bandwidth again, does not just ensure the filter with low insertion loss requirement of device.
Summary of the invention
The utility model provides low-insertion-loss acoustic surface wave filter, to solve in prior art when ensureing filter with low insertion loss requirement, and the problem that SAW (Surface Acoustic Wave) filter relative bandwidth is wide not, the utility model adopts following technical scheme for this reason:
Surface Acoustic Wave Filter, comprise the first input interdigital transducer, first output interdigital transducer, second input interdigital transducer and the second interdigital output transducer, first input interdigital transducer and the first output interdigital transducer with the use of, second input interdigital transducer and the second interdigital output transducer with the use of, first input interdigital transducer and the second input interdigital transducer Longitudinal data Structural assignments are on substrate, first output interdigital transducer and the second interdigital output transducer Longitudinal data Structural assignments are on substrate, the input electrode of the first input interdigital transducer is connected with the input pad of base respectively by lead-in wire with the input electrode of the second input interdigital transducer, the output electrode of the first output interdigital transducer is connected with the o pads of base respectively by lead-in wire with the output electrode of the second interdigital output transducer.
The utility model execution mode is connected on same pad by the input/output terminal of the Longitudinal data structure of every two transducers composition and defines parallel circuits, when ensureing Surface Acoustic Wave Filter filter with low insertion loss, the relative bandwidth adding device simultaneously structure is simply easy to produce.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram that Surface Acoustic Wave Filter described in the utility model is formed on substrate material.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The electrical block diagram that the Surface Acoustic Wave Filter provided at the utility model execution mode is formed on substrate material as shown in Figure 1, comprise the first input interdigital transducer 1, first output interdigital transducer 2, second input interdigital transducer 3 and the second interdigital output transducer 4, first input interdigital transducer 1 and the first output interdigital transducer 2 with the use of, second input interdigital transducer 3 and the second interdigital output transducer 4 with the use of, first input interdigital transducer 1 and the second input interdigital transducer 3 Longitudinal data Structural assignments are on substrate, first output interdigital transducer 2 and the second interdigital output transducer 4 Longitudinal data Structural assignments are on substrate, the input electrode of the first input interdigital transducer 1 is connected with the input pad of base respectively by lead-in wire with the input electrode of the second input interdigital transducer 3, the output electrode of the first output interdigital transducer 2 is connected with the o pads of base respectively by lead-in wire with the output electrode of the second interdigital output transducer 4.
Further, described first input interdigital transducer 1 and other electrode equal ground connection of the second input interdigital transducer 3 except input electrode, the first output interdigital transducer 2 and other electrode equal ground connection of the second interdigital output transducer 4 except output electrode.
Particularly, the first input interdigital transducer 1, first output interdigital transducer 2, second input interdigital transducer 3 and the second interdigital output transducer 4 all adopt the transducer of SPA124 model.
The first input interdigital transducer 1 and the second input interdigital transducer 3 longitudinal arrangement in the utility model embodiment, form a conventional Longitudinal data structure, form a bandwidth slightly narrow, the low loss filter that frequency is slightly low; The first output interdigital transducer 2 and the second interdigital output transducer 4 longitudinal arrangement, form the Longitudinal data structure that another is conventional, form a bandwidth slightly narrow, the low loss filter that frequency is slightly high.First input interdigital transducer 1 and second inputs interdigital transducer 3 and the first output interdigital transducer 2 and the second interdigital output transducer 4 liang and organizes Longitudinal data Structural assignments on the same chip, and respectively the input electrode of the first input interdigital transducer 1 and the second input interdigital transducer 3 is connected on the input pad of base by lead-in wire, respectively the output electrode of the first output interdigital transducer 2 and the second interdigital output transducer 4 is connected on the o pads of base by lead-in wire, form a parallel-connection structure, namely every two transducers form a Longitudinal data structure, then the input/output terminal of Longitudinal data structure is connected on the same pad of shell with lead-in wire, form parallel circuits.When ensureing Surface Acoustic Wave Filter filter with low insertion loss, adding the relative bandwidth of device, making relative bandwidth to reach more than 6.5%, structure is simply easy to produce simultaneously.
The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model embodiment discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (2)
1. Surface Acoustic Wave Filter, it is characterized in that, comprise the first input interdigital transducer (1), first output interdigital transducer (2), second input interdigital transducer (3) and the second interdigital output transducer (4), first input interdigital transducer (1) with the first output interdigital transducer (2) with the use of, second input interdigital transducer (3) and the second interdigital output transducer (4) with the use of, first input interdigital transducer (1) and the second input interdigital transducer (3) Longitudinal data Structural assignments are on substrate, first output interdigital transducer (2) and the second interdigital output transducer (4) Longitudinal data Structural assignments are on substrate, the input electrode of the first input interdigital transducer (1) is connected with the input pad of base respectively by lead-in wire with the input electrode of the second input interdigital transducer (3), the output electrode of the first output interdigital transducer (2) is connected with the o pads of base respectively by lead-in wire with the output electrode of the second interdigital output transducer (4).
2. Surface Acoustic Wave Filter according to claim 1, it is characterized in that, described first input interdigital transducer (1) and the second input interdigital transducer (3) the equal ground connection of other electrode except input electrode, the first output interdigital transducer (2) and other electrode equal ground connection of the second interdigital output transducer (4) except output electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420466342.8U CN204131476U (en) | 2014-08-18 | 2014-08-18 | Surface acoustic wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420466342.8U CN204131476U (en) | 2014-08-18 | 2014-08-18 | Surface acoustic wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131476U true CN204131476U (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420466342.8U Active CN204131476U (en) | 2014-08-18 | 2014-08-18 | Surface acoustic wave filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131476U (en) |
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2014
- 2014-08-18 CN CN201420466342.8U patent/CN204131476U/en active Active
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