کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Near-Field Magnetic Field Shaping Using a Resonant Metasurface for Cryptochrome-Oriented Bioelectromagnetic Studies

نویسندگان :

Mohammad Salmani shahroodi¹ Ali Abdolali²

1- دانشگاه علم و صنعت ایران 2- دانشگاه علم و صنعت ایران

کلمات کلیدی :

Bioelectromagnetic،Resonant Magnetic Metasurface

چکیده :

This paper presents a resonant magnetic metasurface for near-field magnetic-field engineering with a focus on bioelectromagnetic applications related to cryptochromes. Motivated by biophysical evidence indicating cryptochrome sensitivity to weak magnetic fields in the millitesla range and at low radio frequencies, a synthesis-based design framework is proposed that enables direct mapping of biological requirements to physically realizable electromagnetic parameters. The design objective is to generate a magnetic field with a dominant vertical component and a relatively uniform spatial distribution over a 150 × 150 mm² target region, located at a distance of 90 mm from the metasurface plane, operating at 150 kHz. In the proposed approach, each metasurface unit cell is modeled as an equivalent magnetic dipole, and the required dipole-moment distribution is obtained by solving a least-squares field synthesis problem. The synthesized distribution is physically implemented using a 5 × 5 array of circular spiral resonators on a PCB substrate, where the magnitude of the magnetic dipole moment is controlled through resonant tuning via capacitive loading, and its polarity is set by the direction of current circulation. Full-wave near-field simulations demonstrate that the resulting magnetic field on the observation plane exhibits an average magnitude of approximately 5 mT. Moreover, good agreement between full-wave simulations and an independent dipole-based numerical model implemented in MATLAB validates the proposed synthesis and design framework. The presented metasurface provides a compact, robust, and scalable platform for controlled magnetic-field exposure in cryptochrome-oriented bioelectromagnetic studies.