Surface acoustic wave device with adjustable band gap

A technology of surface acoustic wave devices and band modulation, which is applied in the direction of electrical components, impedance networks, etc., can solve the problem that the band gap cannot be adjusted again, and achieve the effect of reducing the cost of experiments

Pending Publication Date: 2019-09-27
宁海县浙工大科学技术研究院
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiency that the existing surface acoustic wave device cannot adjust the bandgap again, the present

Method used

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  • Surface acoustic wave device with adjustable band gap
  • Surface acoustic wave device with adjustable band gap
  • Surface acoustic wave device with adjustable band gap

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] refer to Figure 1 to Figure 4 , an adjustable bandgap surface acoustic wave device, comprising a piezoelectric film 2, interdigital electrodes 1 on the film and a flexible phononic crystal patch 3, the interdigital electrodes 1 are located on both sides of the film 2, the The flexible phononic crystal patch 3 is located in the middle of the film 2,

[0023] The flexible phononic crystal patch 3 adopts a two-dimensional phononic crystal, and the wave equation in the XY mode of the phononic crystal is:

[0024]

[0025] Among them, ρ(r) is the density parameter of the material, λ(r), μ(r) are the first parameter of Lame and the second parameter of Lame, which are collectively referred to as material parameters; u xy (r, t) represents the displacement function under the position vector r, t represents the time component, and the subscripts x and y represent t...

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PUM

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Abstract

The invention discloses a surface acoustic wave device with an adjustable band gap. The device comprises a piezoelectric film, an interdigital electrode on the film and a flexible phononic crystal patch, the interdigital electrodes are located on the two sides of the thin film, the flexible photonic crystal patch is located in the middle of the thin film, and the flexible photonic crystal patch adopts a function relationship among a two-dimensional photonic crystal, the hardness of matrix PDMS and a photonic crystal band gap arranged under a two-dimensional periodic structure, so that the purpose of manually controlling the photonic crystal band gap is quantitatively achieved; and the band gap of the surface acoustic wave device is adjusted by changing the band gap of the photonic crystal. According to the invention, the band gap of the surface acoustic wave device can be adjusted without re-preparation, so that the experiment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of a surface acoustic wave device, in particular to a structure of a surface acoustic wave device with an adjustable band gap. Background technique [0002] Surface Acoustic Wave (SAW) is a kind of elastic wave propagating along the surface or interface of elastic solid, and surface acoustic wave device is a device that uses surface acoustic wave to complete various complex signal processing. Surface acoustic wave devices, including: surface acoustic wave filters, surface acoustic wave sensors and other devices, have been widely used in the field of modern radio frequency communication, sensing signal detection fields such as temperature and pressure, but conventional surface acoustic wave devices exist once. After the preparation is completed, the band gap cannot be adjusted again. If the obtained band gap deviates from the actual required band gap, it needs to be prepared again. SUMMARY OF THE INVENTION ...

Claims

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Application Information

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IPC IPC(8): H03H9/02H03H9/17
CPCH03H9/02976H03H9/171
Inventor 诸骏吴化平陈宇丹刘振东
Owner 宁海县浙工大科学技术研究院
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