Patent ID: 6903629

Claim:
A double-sided electrode-free resonator device, comprising: a double-sided mesa resonator plate with a top surface, a top well, a mesa, a bottom well and bottom surface; a top electrode, being deposited on said top surface and having a top narrow portion and a top wide portion, extends into said top well surrounding said mesa, allowing said mesa to protrude upwards; a bottom electrode, being deposited on said bottom surface and having a bottom narrow portion and a bottom wide portion, extends into said bottom well surrounding said mesa, allowing said mesa to protrude downwards; said mesa providing an electrode-free resonator area; a resonator is provided in said resonator area, said resonator having a top resonator portion, a bottom resonator portion and a resonator thickness dimension, t 3 , measured from said top resonator portion to said bottom resonator portion; an exposed top portion of the mesa situated between said resonator and said resonator area defines a first acoustic gap, l 4 , and an exposed bottom portion of the mesa situated between said resonator and said resonator area defines a second acoustic gap, l 4 ; said top electrode and said bottom electrode, being acoustically coupled and controlled by said first and second acoustic gaps, generate an electro-magnetic field between said electrodes causing an excitation voltage within a vibrating area of said resonator plate, that generates an acoustic energy within said resonator plate; and said resonator having a resonator frequency determined by said resonator thickness dimension, t 3 , said resonator area provides an active element trapping said acoustic energy, causing said acoustic energy to be confined to said resonator area to minimize a leakage of said acoustic energy and provide a high Q factor at 3 GHz.