[Phil] decided he would rather ditch the fob altogether and instead implemented a passive Bluetooth keyless ... Bluetooth control over auxiliary electrical systems.

The key components are categorized into active and passive devices. Active components rely on an external power source to control or modify electrical signals. They inject power into a circuit and are ...

Electromagnetic absorbers are essential in energy, stealth, and communication technologies, yet current designs underperform.

Traditionally however, the use of such passive features, for instance for reactor scram, were of limited extent, and safety systems heavily relied on active driving devices, e.g. electrical or Diesel ...