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
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[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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