Scalable Galvanic Isolators with High Isolation Realized by Magnetoelectric Gyrators

A scalable, passive galvanic isolator, consisting of a ferrite/piezoelectric magnetoelectric (ME) composite with a coil wound round it, was fabricated and developed. In this scheme, the two ports of the isolator exhibit corresponding inductive/capacitive behaviors, and an induced impedance difference facilitates a high isolation realization for signal transferring/blocking. Non-reciprocity of the device was characterized and verified by its mutual transfer impedance. In addition, a key parameter defined by the self-impedance transfer ratio of |Z(22)|/|Z(11)| was introduced to quantitatively describe the isolating performance, and the measured |Z(22)|/|Z(11)| reached as high as 1220 at the optimum bias of H = 190 Oe. The proposed ferrite/piezoelectric ME isolator exhibiting significant desired properties is of importance for signal propagation/blocking due to its impedance difference and non-reciprocity.

Automated summary

A scalable, passive galvanic isolator composed of a ferrite/piezoelectric magnetoelectric (ME) composite with a coil wound around it was developed. The isolator exhibits inductive/capacitive behaviors at its two ports, and an induced impedance difference enables high isolation for signal transferring/blocking. The non-reciprocity of the device was characterized and verified through mutual transfer impedance measurement. Additionally, the self-impedance transfer ratio of |Z(22)|/|Z(11)| was introduced as a key parameter to quantify the isolating performance, reaching up to 1220 at the optimum bias of H = 190 Oe. The proposed ferrite/piezoelectric ME isolator with significant desired properties is important for signal propagation/blocking due to its impedance difference and non-reciprocity.