Performance Enhancement for Bending Mode Magnetoelectric Resonators With Variable Section via Equivalent Circuit Model

High-sensitivity detection technology for low-frequency characteristic magnetic signals is urgently needed in fields such as power grid inspection, industrial fault detection, and geological exploration. Magnetoelectric (ME) sensors, owing to their resonance enhancement characteristics, are suitable for detecting weak magnetic signals at specific frequencies. This work enhances the performance of bending mode ME resonators through variable section (V-S) structure design and develops an equivalent circuit model based on a segmentation method to rapidly calculate their theoretical performance. Experimental results verify the model’s validity, further refining the theoretical model of ME resonators and facilitating their practical applications. The study provides a rapid calculation method suitable for V-S structures and a novel design approach for developing ME sensors operating in low-frequency bending vibration mode.