Patent ID: 8410865
Filing Date: 2013-04-02
Classification: H03H

Abstract:
1. A surface acoustic wave filter comprising: a piezoelectric body; an IDT electrode on the piezoelectric body; and signal wiring electrically connected to the IDT electrode, wherein the IDT electrode and the signal wiring overlap each other at respective outer edges, and in the outer edges where the IDT electrode and the signal wiring overlap each other, the IDT electrode and the signal wiring have a total thickness not less than a skin depth “d” (μm), the skin depth “d” being calculated by Formula 1: where “f” represents a frequency (GHz) of a signal passing through the signal wiring, and “σ” represents an electrical conductivity (S/m) of the signal wiring, and wherein the total thickness is in a range of 1.0 to 1.2 times the skin depth “d”.