Extracting equivalent circuit model of magnetoelectric gyrator using vector network analyzer

The magnetoelectric (ME) effect is a polarization change induced by an applied magnetic field, or conversely a magnetization change induced by an applied electric field. The giant ME effect found in coil-wrapped magnetostrictive/piezoelectric laminated composites can be utilized to realize gyrators. Until now, there is little reported work regarding how to extract the equivalent circuit model of such ME gyrator from measurement. In this work, we report an effective method to accurately extract the equivalent circuit model from the measured impedance parameters using a vector network analyzer (VNA). The two-port ME gyrator under investigation consists of a plate type piezoelectric/magnetostrictive laminate, in which the piezoelectric layer (PZT) is sandwiched between two magnetostrictive layers (metglass). A 30-turn coil is wrapped around the laminate serving as port 1. The metal electrodes on the surfaces of PZT layer are used as port 2. All the model parameters of the gyrator were extracted from the measured impedance parameters using a VNA. Good agreement between the model and measured results proves that the proposed extraction method is valid and accurate.