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Block-weighted surface acoustic wave split-finger transducer

A surface acoustic wave and split-finger technology, applied to electrical components, impedance networks, etc., can solve problems such as precise weighting restrictions, and achieve the effects of accurate weighting, small diffraction, and improved out-of-band suppression

Inactive Publication Date: 2010-09-15
BEIJING JINGXINGWANGXIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with finger weighting, this method can obtain relatively good near stop band and far stop band characteristics, but since a single finger is calculated with a cycle λ, its precise weighting is limited
[0005] In summary, it can be seen that the weighting structures of the existing IDTs have their own disadvantages

Method used

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  • Block-weighted surface acoustic wave split-finger transducer
  • Block-weighted surface acoustic wave split-finger transducer
  • Block-weighted surface acoustic wave split-finger transducer

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] As mentioned above, as far as the weighting technology of the existing interdigital transducer is concerned, the cut-finger weighted transducer with a split-finger structure deteriorates the characteristics of the filter due to the diffraction effect of the sound wave when the transducer is longer. However, the weighting frequency of the single-finger weighted transducer is relatively low, which limits the precise weighting of the transducer. In view of this, the present invention proposes a surface wave transducer with a brand new structure.

[0021] like figure 2 As shown, the block-weighted surface acoustic wave split-finger transducer designed in the present invention includes: a piezoelectric substrate 1 , interdigital bus electrodes 2 , interdigital fingers 3 and electrode interfaces 4 . The interdigital bus electrode 2 is directly conne...

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Abstract

The invention provides a block-weighted surface acoustic wave split-finger transducer, which comprises a piezoelectric substrate, an interdigital bus electrode, a finger and an electrode interface, wherein the interdigital bus electrode is directly connected with the electrode interface and the finger and the interdigital bus electrode are arranged on the piezoelectric substrate. The block-weighted surface acoustic wave split-finger transducer is characterized in that: the finger is a block-weighted finger; and the block-weighted finger is designed into a split finger structure. Because the transducer adopts the block-weighted structure of the split-finger interdigital structure, the using frequency is improved, and the defects that the single-finger block weight is not precise enough and the split-finger weight is large in diffraction are overcome; therefore, the block-weighted split-finger structure with accurate weight and small diffraction is obtained, and the performance such as out-of-band inhibition, pass-band ripple, rectangular coefficient, and the like of the transducer can be enhanced comprehensively.

Description

technical field [0001] The invention relates to a single-finger block-weighted transducer, which adopts a split-finger interdigital structure design, thereby increasing the frequency of use of the block-weighted transducer to obtain a transducer with better weighting accuracy and smaller diffraction effects The device belongs to the technical field of surface acoustic wave. Background technique [0002] The surface acoustic wave (SAW) interdigital transducer (IDT) has been studied since the 1960s. Due to its small size and high design flexibility, it is widely used in intermediate frequency and radio frequency filters. [0003] like figure 1 As shown, a typical surface acoustic wave transducer consists of a piezoelectric substrate, interdigital bus electrodes, interdigital electrodes, and an electrode interface. The two electrodes of the IDT are directly connected to the ports of the circuit. When the interdigital transducer is used as the input transducer, the alternatin...

Claims

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Application Information

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IPC IPC(8): H03H9/145
Inventor 吴明星徐子耀黄平
Owner BEIJING JINGXINGWANGXIN TECH
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