Patent ID: 8222970
Filing Date: 2012-07-17
Classification: H03H

Abstract:
1. A resonant device comprising: a first piezoelectric thin film resonator including, a second piezoelectric thin film resonator including, wherein a first membrane region in which the first lower electrode opposes to the first upper electrode through the first piezoelectric film and a second membrane region in which the second lower electrode opposes to the second upper electrode through the second piezoelectric film are laminated through a second cavity, and wherein the second piezoelectric thin film resonator is mounted directly on the first piezoelectric thin film resonator with the second cavity interposed therebetween such that a portion of at least the second lower electrode of the second piezoelectric thin film resonator that is outside of the second membrane region is anchored directly on a portion of the first piezoelectric thin film resonator outside of the first membrane region.