Piezoelectrically actuated magnetic dipole twisting resonators enable miniaturized low-frequency antennas.

Piezoelectrically actuated biomimetic twisting resonators enable low-frequency magnetic-dipole antennas at 15.4 and 668 hertz to reach centimeter- and millimeter-scale sizes with radiation efficiencies up to 49,000× and 5000× over size-matched loop antennas.

• Why it matters: Miniaturized low-frequency antennas are limited by the size–efficiency trade-off, which constrains underwater, underground, and biomedical communications.
• What they did: The work uses piezoelectrically driven mechanical twisting oscillations of a magnetic dipole with ultrahigh mechanical quality factors, demonstrating antenna operation at 15.4 and 668 hertz and comparing radiation efficiency to size-matched loop antennas.
• The result: Underwater cross-medium communication over 115 meters is shown with milliwatt-level power and 99.9% less power than loop antennas, and implantable devices achieve a fourfold range increase at identical power.

AI summary of the abstract · may contain errors · not medical advice · read the paper.