Patent ID: 7936110

Claim:
A mechanical planar structure comprising: a substrate comprising an effective thickness inactive piezoelectric (ETIP) material, said ETIP being a material, composite material, structure, or composite structure such that, if the thickness direction is defined to be X 3 (Cartesian Z), then the aggregate piezoelectric properties provide a trivial value for the sum of the squares of the six piezoelectric constants, e3J, compared to the sum of the squares of the remaining shear coupling constants, e 14 , e 15 , e 16 , e 24 , e 25 , and e 24 ; a plurality of coplanar electrodes coupled to said ETIP, said electrodes being separated by at least one gap, said electrodes being excitable by an alternating electric potential; wherein when said electrodes being coupled to said potential, said ETIP supports lateral field excitation (LFE) of a thickness shear mode.