A Wideband ME Dipole-Enabled DAM Antenna for IntegratedFrequency-Agile Sub-6 GHz Communication and Vital Sign Sensing

This paper presents a wideband magnetoelectric (ME) dipole antenna integrated with a switch-controlled direct antenna modulation (DAM) network for frequency-agile sub-6-GHz integrated sensing and communication (ISAC). The antenna employs a microstrip-line aperture-coupled excitation to achieve broadband operation from 2.5 to 4.5 GHz, while feed-direction switching provides two stable far-field phase states enabling mixer-free Binary Phase Shift Keying (BPSK) modulation. A prototype is designed and fabricated to validate the proposed architecture. Measurements demonstrate reliable wideband BPSK communication, accurate Doppler extraction, and simultaneous recovery of communication data and human vital-sign signatures across multiple carrier frequencies. These results confirm that combining ME-dipole radiation with DAM offers a compact, low-complexity platform for wideband ISAC applications.