Abstract: Filter circuits having acoustic wave resonators in a transversal configuration are disclosed. In the transversal configuration, the acoustic wave resonators are arranged transverse to an input and output port of the filter circuit. As such, all the acoustic wave resonators of the filter circuit are connected to the input port and connected to the output port. In the transversal configuration, the filter circuit can be designed for any transfer function without being restricted to a coupling coefficient of a piezoelectric material used in the acoustic wave resonators. In this regard, the filter circuit can achieve very wideband filter responses, multiband responses, and/or responses with arbitrary position of transmission zeros. The filter circuit having the transversal configuration can also be designed for complex transmission zeros for phase equalization.

Abstract: Filter circuits having acoustic wave resonators in a transversal configuration are disclosed. In the transversal configuration, the acoustic wave resonators are arranged transverse to an input and output port of the filter circuit. As such, all the acoustic wave resonators of the filter circuit are connected to the input port and connected to the output port. In the transversal configuration, the filter circuit can be designed for any transfer function without being restricted to a coupling coefficient of a piezoelectric material used in the acoustic wave resonators. In this regard, the filter circuit can achieve very wideband filter responses, multiband responses, and/or responses with arbitrary position of transmission zeros. The filter circuit having the transversal configuration can also be designed for complex transmission zeros for phase equalization.