Patent ID: 6611182
Filing Date: 2003-08-26
Classification: H03H,Y10T

Abstract:
A piezoelectric filter comprising:a first piezoelectric substrate including a first piezoelectric filter unit and a first transfer capacitor unit; a second piezoelectric substrate including a second piezoelectric filter unit and a second transfer capacitor unit; an adhesive layer having a thickness between about 60 &mgr;m and about 200 &mgr;m and disposed between the first and the second piezoelectric substrates so that a laminate including the first and the second piezoelectric substrates and said adhesive layer is defined; and a plurality of external electrodes disposed on the outwardly facing surfaces of said laminate; wherein the modulus of elasticity of said adhesive layer is in the range of about 0.5 MPa to about 3000 MPa, said adhesive layer having at least one notch at the edge, and a material from which the external electrodes are formed is disposed into said at least one notch.