CN207150549U - A kind of wave filter of sector structure - Google Patents
A kind of wave filter of sector structure Download PDFInfo
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- CN207150549U CN207150549U CN201721074764.0U CN201721074764U CN207150549U CN 207150549 U CN207150549 U CN 207150549U CN 201721074764 U CN201721074764 U CN 201721074764U CN 207150549 U CN207150549 U CN 207150549U
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- wave filter
- sector structure
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- weighting
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Abstract
The utility model discloses a kind of wave filter of sector structure, the interdigital transducer that the wave filter is formed by the metal film being deposited on piezoelectric substrate materials forms, and sets the weighting of gradual change finger in addition on the interdigital transducer of sector structure.The wave filter of said structure can effectively improve Out-of-band rejection, so as to reach more preferable filter effect.
Description
Technical field
It the utility model is related to electronic component technology field, more particularly to a kind of wave filter of sector structure.
Background technology
At present, SAW filter has evolved to the stage of a comparative maturity, there is a kind of the characteristics of intermediate frequency demand
It is that relative bandwidth is wider, insertion loss is smaller；Although traditional sector design structure can meet wider relative bandwidth, less
Insertion loss demand, but proximal inhibition can only typically accomplish 40dB, and during practical application wave filter, in order to reach more preferable filter
Ripple effect, it is often desired to which Out-of-band rejection is tried one's best, in the prior art design as shortage.
The content of the invention
The purpose of this utility model is to provide a kind of wave filter of sector structure, and the wave filter of the structure can effectively improve band
Outer suppression, so as to reach more preferable filter effect.
A kind of wave filter of sector structure, the fork that the wave filter is formed by the metal film being deposited on piezoelectric substrate materials
Finger transducer forms, and sets the weighting of gradual change finger in addition on the interdigital transducer of sector structure.
The interdigital transducer includes input transducer and output transducer；
And the input transducer side is provided with the weighting of gradual change finger；
The weighting of gradual change finger is also equipped with the output transducer side.
It is outer to effectively improve band for the wave filter of said structure it can be seen from above-mentioned technical scheme provided by the utility model
Suppress, so as to reach more preferable filter effect.
Brief description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment
The accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present utility model
Example, on the premise of not paying creative work, can also be according to these accompanying drawings for one of ordinary skill in the art
Obtain other accompanying drawings.
Fig. 1 is provided the electrical block diagram of the wave filter of sector structure by the utility model；
Fig. 2 is provided another electrical block diagram of the wave filter of sector structure by the utility model；
Fig. 3 is the frequency response schematic diagram of sector structure wave filter provided by the utility model.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole realities
Apply example.Based on embodiment of the present utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment obtained, belongs to the scope of protection of the utility model.
The utility model embodiment is described in further detail below in conjunction with accompanying drawing, is as shown in Figure 1 this practicality
The electrical block diagram of the wave filter of new provided sector structure, the wave filter is by being deposited on piezoelectric substrate materials
The interdigital transducer composition that metal film is formed, is the input transducer of wave filter such as the sign 1 in Fig. 1, and in the sector structure
Input transducer 1 on gradual change finger weighting 3 is set in addition.
It is illustrated in figure 2 another electrical block diagram that the utility model provides the wave filter of sector structure, the Fig. 2
In sign 2 be wave filter output transducer, be equally also equipped with gradual change in the side of the output transducer 2 of the sector structure
Finger weighting 4.
Pass through the design of foregoing circuit structure, so that it may so that reflective function and the change of transducing function are slow, more approach and set
Evaluation, so as to improve design accuracy, frequency response is preferable, especially proximal inhibition, has reached 50dB, and it is new to be illustrated in figure 3 this practicality
The frequency response schematic diagram for the sector structure wave filter that type is provided.
It is described above, the only preferable embodiment of the utility model, but the scope of protection of the utility model is not
This is confined to, any one skilled in the art can readily occur in the technical scope that the utility model discloses
Change or replacement, should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should
It is defined by the protection domain of claims.
Claims (2)
1. a kind of wave filter of sector structure, it is characterised in that the wave filter is by the metal that is deposited on piezoelectric substrate materials
The interdigital transducer composition that film is formed, and the weighting of gradual change finger is set in addition on the interdigital transducer of sector structure.
2. the wave filter of sector structure according to claim 1, it is characterised in that the interdigital transducer includes input transducing
Device and output transducer；
And the input transducer side is provided with the weighting of gradual change finger；
The weighting of gradual change finger is also equipped with the output transducer side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721074764.0U CN207150549U (en) | 2017-08-25 | 2017-08-25 | A kind of wave filter of sector structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721074764.0U CN207150549U (en) | 2017-08-25 | 2017-08-25 | A kind of wave filter of sector structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207150549U true CN207150549U (en) | 2018-03-27 |
Family
ID=61670034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721074764.0U Active CN207150549U (en) | 2017-08-25 | 2017-08-25 | A kind of wave filter of sector structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207150549U (en) |
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2017
- 2017-08-25 CN CN201721074764.0U patent/CN207150549U/en active Active
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