Patent ID: 6388545
Filing Date: 2002-05-14
Classification: H01L,H03H

Abstract:
A SAW-filter device, comprising:a piezoelectric substrate; a double-mode SAW-filter circuit formed on said piezoelectric substrate; said double-mode SAW-filter circuit provided on said piezoelectric substrate; a package body including therein a space, said package body accommodating said piezoelectric substrate in said space together with said double-mode SAW-filter circuit, said package body carrying an input and an output pad, said package body further carrying a plurality of ground pads separated from each other, said plurality of ground pads including a first ground pad and a second ground pad, said piezoelectric substrate being mounted upon said package body in a face-down state; and a conductor cap member provided on said package body so as to close said space, said cap member being electrically connected to one of said first and second ground pads.