XBAR-Structured Magnetoelectric Antenna With Magnetostrictive Interdigital Transducers

This letter presents an ultra-compact magnetoelectric (ME) antenna based on a laterally excited bulk acoustic wave resonator (XBAR) structure integrated with magnetostrictive (MS) interdigital transducers (IDTs). The antenna design leverages three distinct resonant regions within a single device: pseudo thin-film bulk acoustic resonator (PFBAR) and contour mode resonator (CMR)-like single-IDT regions, XBAR-type paired-IDT regions, and a floating electrode higher-overtone bulk acoustic resonator (FHBAR) region. These resonant units collectively enable multimodal electromagnetic (EM) radiation with improved gain and broadened operational bandwidth. The device is fabricated using a FeGaB/AlScN/Mo multilayer stack on a silicon substrate via CMOS-compatible processes. Experimental results demonstrate peak gains of −17.8 dBi at 0.268 GHz and −20.5 dBi at 0.667 GHz. This work provides new insights into the design of high-integration, multimode ME antennas and offers a promising solution for future miniaturized wireless communication systems.