Surface acoustic wave device with unidirectional transducer

A surface acoustic wave and converter technology, applied in the direction of instruments, electrical components, sound-generating devices, etc., can solve problems such as manufacturing difficulties, high operating frequency, and short operating wavelength

Active Publication Date: 2020-08-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the minimum width of the electrodes is limited by the smallest feature size possible under practical manufacturing considerations (typically around 0.2 μm), very high operating frequencies (i.e., very short operating wavelengths) may not be achievable
For devices using film-thickness-differential SPUDTs, the electrode design is more complex, often resulting in manufacturing difficulties

Method used

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  • Surface acoustic wave device with unidirectional transducer
  • Surface acoustic wave device with unidirectional transducer
  • Surface acoustic wave device with unidirectional transducer

Examples

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Embodiment Construction

[0045] In various examples, the present disclosure describes a surface acoustic wave (SAW) device in which at least one interdigital transducer (IDT) generates a SAW that propagates in only one direction (ie, unidirectional). With reasonable IDT electrode design, the direction of wave propagation can be controlled. The disclosed example SAW devices can address one or more disadvantages of devices using conventional single-phase unidirectional transducers (SPUDTs) (e.g., natural SPUDTs (natural SPUDTs, NSPUDTs), floating electrode unidirectional Converter (floating electrode unidirectional transducer, FEUDT), film thickness difference type SPUDT, etc.).

[0046] figure 1 An example conventional SAW device 100, in this case a transversal filter, is shown in . The dimensions of some features are exaggerated for illustrative purposes. For the purpose of illustration, the following description takes a transversal SAW filter as an example. However, the techniques described herei...

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PUM

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Abstract

A surface acoustic wave (SAW) device (200), the SAW device (200) includes a piezoelectric layer (304) and a transducer (204,206) having a plurality of electrodes (214). The electrodes (214) are aligned with respective longitudinal axes parallel to each other and perpendicular to a wave propagation direction (220). Each electrode (214) includes a conductive first layer (216) having a first thickness and a first width in the wave propagation direction; and a conductive second layer (218) having a second thickness that is negligible compared to the first thickness. The first layer (216) and second layer (218) are in electrical contact with each other to provide electrical conduction over a total width of the electrode (214) in the wave propagation direction (220), the total width being greater than the first width of the first layer (216).

Description

[0001] Related Applications Cross Application [0002] This application claims the priority of U.S. Patent Application No. 15875174, filed on January 19, 2018, entitled "SURFACE ACOUSTIC WAVE DEVICE WITH UNIDIRECTIONAL TRANSDUCER", the content of which is adopted Incorporated into this text by way of reference. technical field [0003] The present invention relates to a surface acoustic wave (surface acoustic wave, SAW) device, in particular to a SAW device for unidirectional wave propagation. Background technique [0004] In communication systems (eg, including terminals and base station infrastructure), surface acoustic wave (SAW) devices such as filters and resonators are widely used. A SAW device can be implemented using an interdigital transducer (IDT). The SAW generated by IDT is generally bidirectional. In the case of a transversal SAW filter, the SAW device has an input IDT and an output IDT. The SAW generated by the input IDT propagates bidirectionally, so that ...

Claims

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Application Information

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IPC IPC(8): H03H9/25H03H9/64
CPCG10K11/36H03H9/14505H03H9/02574H03H3/08H03H9/6436H03H9/6463
Inventor 陈卓辉
Owner HUAWEI TECH CO LTD
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