SAW device comprising mixed weighted reflecting grating and mixed weighted reflecting grating

A reflective grid and device technology, applied in the direction of electrical components, impedance networks, etc., can solve the problems of degrading 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 improving the Q value

Active Publication Date: 2022-04-01
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 comprising mixed weighted reflecting grating and mixed weighted reflecting grating
  • SAW device comprising mixed weighted reflecting grating and mixed weighted reflecting grating
  • SAW device comprising mixed weighted reflecting grating and mixed weighted reflecting grating

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Embodiment 1

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

[0036] In one example. Such as figure 2 As shown, the above-mentioned two hybrid weighted reflective gratings 3 are symmetrically arranged at both ends of the IDT 2 in the wave transmission direction, and are used to reflect the waves excited by the IDT 2 .

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

[0038] Such as figure 2 As shown, each hybrid weighted ...

Embodiment 2

[0058] Such as figure 2 As shown, the embodiment of the present invention provides a SAW device including a hybrid weighted reflective grid, the hybrid weighted reflective grid 3 includes a plurality of reflective grid electrodes distributed at equal intervals, and the length and width of the multiple reflective grid electrodes are equal to 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 reflective grating is as follows image 3 As shown, the electrode materials can be reduced and the device can be made more compact. The structure of the apodized weighted reflective grating is as follows Figure 4 As 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 integrating the advantages of the two structures can be obtained as figure 2...

Embodiment 3

[0068] This embodiment protects a hybrid weighted reflective grid, which includes multiple reflective grid electrodes distributed at equal intervals, and the lengths and widths of the multiple reflective grid electrodes decrease gradually in a preset direction.

[0069] An exemplary distribution function of the length of the reflective grid electrode in the hybrid weighted reflective grid is: ;in, l i Indicates the length of the i-th reflective grid electrode in the preset direction, A Indicates 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 reflective grid electrode in the hybrid weighted reflective grid is: ;in, w i Indicates 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] The d...

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Abstract

The invention relates to an SAW device comprising mixed weighted reflecting gratings and the mixed weighted reflecting gratings, and belongs to the technical field of radio frequency filtering, the SAW device comprises a piezoelectric substrate, an interdigital transducer and two mixed weighted reflecting gratings, the interdigital transducer and the two mixed weighted reflecting gratings are arranged on the piezoelectric substrate, each mixed weighted reflecting grating comprises a plurality of reflecting grating electrodes which are distributed at equal intervals, and the reflecting grating electrodes are arranged on the piezoelectric substrate. The lengths and the widths of the plurality of reflecting gate electrodes are gradually reduced in a preset direction, and the preset direction is a direction far away from the interdigital transducer. Therefore, according to the invention, the mixed weighted reflecting grating is arranged to be a plurality of reflecting grating electrodes which are distributed at equal intervals, and the lengths and the widths of the plurality of reflecting grating electrodes are gradually reduced in the direction far away from the interdigital transducer, so that a mixed weighted structure combining width gradual-change weighting and apodization weighting is formed; the transverse clutter generated in the SAW device can be suppressed under a more compact structure, the clutter suppression performance is improved, the frequency response characteristic of the SAW device is improved, and then the Q value of the SAW device is improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency filtering, in particular to a SAW device including a hybrid weighted reflection grid and the hybrid weighted reflection grid. Background technique [0002] Existing SAW (surface acoustic wave, surface acoustic wave filter) devices with reflective structures such as figure 1 As shown, the reflective grid is used to reflect the sound wave energy to the central area to improve energy utilization. However, increasing the reflective 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, deteriorating the frequency response characteristics of the SAW devi...

Claims

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Application Information

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Patent Type & Authority Applications(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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