Patent ID: 7868517

Claim:
A lamb wave resonator comprising: at least one piezoelectric layer; and a first electrode against a first face of said at least one piezoelectric layer and comprising a pattern parallel to a plane of the first face, the pattern comprising a plurality of fingers and a contact arm, each finger comprising a first side in contact with said contact arm and two other sides parallel to one another, and said plurality of fingers being spaced apart from one another by a distance W calculated according to the following equation: W = n · va lateral f , with ⁢ ⁢ n ∈ N where, va lateral is an acoustic propagation speed of Lamb waves, n is an order of a resonance mode of the Lamb waves, f is a resonance frequency of the Lamb wave resonator, and said at least one piezoelectric layer having at least one recess between said plurality of fingers of said first electrode.