Equivalent Circuit Modeling of Stacked Crystal Filters

Abstract

The traditional stacked crystal filter (SCF) is composed of two bonded piezoelectric plates with a common ground plane at the bond line. Thus, the filter input and output terminals are largely isolated by the ground plane electrode to provide a high degree of off resonance rejection. In operation, the system is driven to resonance by the input resonator (transducer) and the resulting energy is radiated to the output plate which acts as a receive transducer to couple the energy to the external electrical circuit.