Patent ID: 8692630

Claim:
A guided acoustic wave resonant device, comprising: at least two filters, each filter comprising at least two acoustic wave resonators, each filter having a useful frequency band centered on a central frequency, the at least two central frequencies being different, each resonator comprising at least one suite of inter-digitated upper electrodes exhibiting a periodic structure having a period and a thin layer of piezoelectric material, each resonator having a coupling coefficient and a resonant frequency; and at least one differentiation layer associated with at least one of the resonators of at least one of the at least two filters; wherein the at least one differentiation layer includes differentiation layer associated with at least one of the resonators of one filter, such that the at least two acoustic wave resonators of said filter are positioned at the differentiation layer; wherein the at least one differentiation layer makes it possible in combination with the period of the inter-digitated electrodes to modify the coupling coefficient of the associated resonator, the useful frequency band and the central frequency being determined by the resonant frequencies and the coupling coefficients of the resonators; and wherein the coupling coefficients of the resonators are adapted so as to provide a determined useful bandwidth, and to make uniform the bandwidths of the useful frequency bands.