# Twisting magnetic-dipole antenna at 15.4 Hz is 49,000 times more efficient than a size-matched loop

- Published: 2026-11-13 06:06 UTC
- Section: Digital & Computing › Connectivity & internet
- Tags: miniaturized low-frequency antenna, twisting resonator, magnetic dipole oscillation, piezoelectric actuation, loop antenna efficiency, underwater cross-medium communication, implantable wireless devices, mechanical quality factor
- URL: https://realtech.media/news/rt-c630ddf95fdfb9975eeee331_twisting_magnetic_dipole/

**Authors demonstrated centimeter- and millimeter-scale antennas for 15.4 and 668 hertz that radiate by mechanical twisting of a magnetic dipole, with a 115-meter underwater link.**

![Twisting magnetic-dipole antenna at 15.4 Hz is 49,000 times more efficient than a size-matched loop](https://realtech.media/media/2026/11/8cbfd32a6013a3b9.jpg)
*ESA – G. Porter, Wikimedia Commons, CC BY-SA 3.0*

A study in Science Advances describes a radiation mechanism for miniaturized low-frequency antennas that replaces the time-varying currents of conventional antennas with the mechanical twisting oscillation of a magnetic dipole [1]. The antennas are built as piezoelectrically actuated, biomimetic twisting resonators with ultrahigh mechanical quality factors. The approach is aimed at the size-efficiency trade-off that limits compact antennas.

The authors demonstrated low-frequency antennas operating at 15.4 and 668 hertz, miniaturized to centimeter and millimeter scale, respectively. Their radiation efficiencies exceed those of size-matched loop antennas by factors of 49,000 and 5000, respectively [1].

In an underwater cross-medium communication demonstration, the link covered 115 meters with only milliwatt-level power consumption, according to the authors. This is 99.9% less power than loop antennas use [1]. Such antennas are needed for underwater, underground and biomedical communications, where performance is constrained by the size-efficiency trade-off. The mechanism also supports implantable wireless devices, which reached a fourfold increase in communication range at identical power consumption [1].

## Sources

1. [Science Advances](https://doi.org/10.1126/sciadv.aek2097)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-c630ddf95fdfb9975eeee331_twisting_magnetic_dipole/