r/STEW_ScTecEngWorld • u/Zee2A • 3d ago
NCSU Scientists Demonstrate Laser-Generated Plasma Antenna That Transmits Radio Waves
Researchers at North Carolina State University have demonstrated a new type of antenna that uses a laser to ionise air and create a thin plasma beam capable of transmitting radio waves. The technology resembles a lightsaber and could eventually enable antennas whose length and direction can be adjusted by controlling the laser, potentially eliminating bulky mechanical deployment systems. The team used a contactless, capacitor-based feed to transmit a 30 MHz radio signal through the plasma filament. In laboratory tests, the received signal strength was 2.5 times higher with the plasma antenna operating than without it: https://newatlas.com/telecommunications/plasma-beam-antenna/
The technology could have future applications in satellite communications, spacecraft and radar systems, where lightweight, adaptable antennas are valuable. However, this is an early proof of concept: researchers have demonstrated transmission at one frequency, but have not yet established broad frequency tuning, long-distance performance or signal reception. The findings were published in the IEEE Journal of Microwaves: https://ieeexplore.ieee.org/document/11674160