Saw device including hybrid weighted reflective grating and hybrid weighted reflective grating

A reflection grid and device technology, applied in electrical components, impedance networks, etc., can solve the problems of deteriorating the frequency response characteristics of SAW devices, unfavorable device miniaturization, and limited clutter suppression functions, so as to improve clutter suppression performance and increase frequency. Response characteristics, the effect of raising the Q value

Active Publication Date: 2022-06-17
深圳新声半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the reflection grid will expand the surface area of ​​the overall device, which is not conducive to the miniaturization of the device, and when an electrical signal is input to the IDT (interdigitaltransducer, interdigital transducer), in addition to exciting the surface acoustic wave with the same frequency as the input , will also generate a small amount of clutter other than the frequency of the input signal, which will deteriorate the frequency response characteristics of the SAW device, and the existing reflective grid structure is also very limited for clutter suppression

Method used

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  • Saw device including hybrid weighted reflective grating and hybrid weighted reflective grating
  • Saw device including hybrid weighted reflective grating and hybrid weighted reflective grating
  • Saw device including hybrid weighted reflective grating and hybrid weighted reflective grating

Examples

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Embodiment 1

[0035] like figure 2 As shown, the present invention provides a SAW device including a hybrid weighted reflection grating, comprising a piezoelectric substrate 1, an interdigital transducer 2 and two hybrid weighted reflection gratings 3 arranged on the piezoelectric substrate 1 , the two hybrid weighted reflection gratings 3 are symmetrically arranged with respect to the interdigital transducer.

[0036] in one example. like figure 2 As shown, the above two hybrid weighted reflection gratings 3 are symmetrically arranged at both ends of the interdigital transducer 2 in the wave transmission direction, and are used to reflect the waves excited by the interdigital transducer 2 .

[0037] It should be noted that, if the surface acoustic wave excited by the interdigital transducer 2 has multiple wave transmission directions, two hybrid weighted reflection gratings 3 may be symmetrically arranged at both ends of each wave transmission direction.

[0038] like figure 2 As sh...

Embodiment 2

[0058] like figure 2 As shown, the embodiment of the present invention provides a SAW device including a hybrid weighted reflection grating, wherein the hybrid weighted reflection grating 3 includes a plurality of reflection grid electrodes distributed at equal intervals, and the length and width of the plurality of reflection grid electrodes are equal to each other. Decrease in the preset direction to form a hybrid weighting structure of width gradient weighting and apodization weighting.

[0059] Among them, the structure of the width gradient weighted reflection grating is as follows image 3 As shown, the material used for electrodes can be reduced and the device can be made more compact. The structure of the apodized weighted reflection grating is shown in Figure 4 shown, the lateral clutter can be suppressed, the Q value of the SAW device can be increased, and the image 3 and Figure 4 Combining the two structures and fusing the advantages of the two structures can...

Embodiment 3

[0068] This embodiment protects a hybrid weighted reflection grid, which includes a plurality of reflection grid electrodes distributed at equal intervals, and the length and width of the plurality of reflection grid electrodes decrease in a predetermined direction.

[0069] An exemplary distribution function of the length of the reflective grid electrode in the hybrid weighted reflective grid is: ;in, l i represents the length of the ith reflection grid electrode in the preset direction, A represents the length of the first reflective grid electrode in the preset direction, a Indicates the first preset parameter.

[0070] An exemplary distribution function of the width of the reflection grid electrode in the hybrid weighted reflection grid is: ;in, w i represents the width of the i-th reflective grid electrode in the preset direction, f represents the second preset parameter, b represents the third preset parameter, c Indicates the fourth preset parameter.

[0071...

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Abstract

The invention relates to a SAW device including a hybrid weighted reflection grid and a hybrid weighted reflection grid, belonging to the technical field of radio frequency filtering, including a piezoelectric substrate, an interdigital transducer arranged on the piezoelectric substrate and two A hybrid weighted reflective grating, the hybrid weighted reflective grating includes a plurality of reflective grid electrodes distributed at equal intervals, and the length and width of the multiple reflective grid electrodes are all decreasing in a preset direction, and the preset direction is away from the interdigitated fingers The orientation of the transducer. It can be seen that in the present invention, the hybrid weighted reflective grid is set as a plurality of reflective grid electrodes distributed at equal intervals, and the length and width of the multiple reflective grid electrodes decrease gradually in the direction away from the interdigital transducer, thereby forming a width The hybrid weighting structure combining gradual weighting and apodization weighting can suppress the lateral clutter generated in the SAW device in a more compact structure, improve the clutter suppression performance, and improve the frequency response characteristics of the SAW device, thereby improving its Q value .

Description

technical field [0001] The present invention relates to the technical field of radio frequency filtering, in particular to a SAW device including a hybrid weighted reflection grating and a hybrid weighted reflection grating. Background technique [0002] Existing SAW (surface acoustic wave, surface acoustic wave filter) devices with reflective structures such as figure 1 As shown, the reflection grating is used to reflect the sound wave energy to the central area to improve the energy utilization rate. However, increasing the reflection grating will enlarge the surface area of ​​the overall device, which is not conducive to the miniaturization of the device, and when an electrical signal is input to the IDT (interdigital transducer), in addition to exciting the surface acoustic wave with the same frequency as the input , it will also generate a small amount of clutter outside the frequency of the input signal, which deteriorates the frequency response characteristics of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/02
Inventor 不公告发明人
Owner 深圳新声半导体有限公司
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