"Here, we report that microwave toroidal pulses can be launched by a ... conical coaxial horn antennas to create a rotating electromagnetic wave structure," the team explained in a statement.

Most famous of these is probably the toroidal propeller that made waves a while ago, mostly in the field of flying drones, but commercial toroidal boat props exist too. Test results of the ...

The scalar toroidal vortex carries transverse orbital ... serve as an “invisible hand” for quantum control and novel wave-matter interactions.” The scientists forecast.

[PDF via NewAtlas] Inspired by some of the experiments with “ring wings” in the early 20th Century, researchers iterated on various toroidal propeller geometries until arriving at one that ...