Patent ID: 7348867
Filing Date: 2008-03-25
Classification: H03H,H04B

Abstract:
1. A filter having an input electrode, an output electrode, and a single acoustic wave resonator disposed between said input electrode and said output electrode, formed on a substrate, said acoustic wave resonator having one resonance mode for use as a filter, wherein: said filter has a number of structures capable of simultaneously and independendy changing all parameters for determining frequency characteristics of said filter, said parameters including a center frequency of said acoustic wave resonator, an external Q-value between said acoustic wave resonator and said input electrode, and an external Q-value between said acoustic wave resonator and said output electrode, said structures being capable of being simultaneously applied with electric signals independently of one another, said number of structures being at least equal to the number of the parameters, and said filter includes an electromechanical transducer having a function capable of mechanically deforming one portion of each of said structures of said filter simultaneously and with finite dependency by individually applying the electric signals to electrodes disposed in said structures, respectively.