Abstract:
Piezoelectric acoustic metamaterial resonators include a piezoelectric substrate having a top surface and a bottom surface and a plurality of magnetostrictive members disposed on the top surface of the piezoelectric substrate and extending along a length of the piezoelectric substrate and spaced across a width of the piezoelectric substrate.
Abstract:
A magnetostrictive mechanical filter comprising at least one rod of a magnetostrictive material forming a resonance element, a spool surrounding the rod, a field coil the windings of which are wound around the spool, and magnets creating a continuous magnetic field, arranged respectively at the ends of the rod, the rod being held radially in at least three points disposed regularly about the rod in the vicinity of the middle portion thereof, a rib being provided at each fixation point, said rib extending parallel to the generatrices of the rod and being formed on the inner peripheral surface of the spool and integrally molded with said spool.
Abstract:
One or more layers of magnetostrictive material are arranged to have a meandering current running therethrough or through a closely spaced sheet of conductive material, to provide longitudinal, torsional or flexural modes of mechanical vibration. For torsional vibration a cylindrical structure having a spiral strip either conductive or magnetostrictive, is described. Copper or gold is deposited on the magnetostrictive material. Ladder filters using magnetostrictive structures consist of a thin sheet with a layer of magnetostrictive material thereon suitably cut to provide a number of reeds.