GaN is a potential superconductor which can replace silicon. DARPA is funding a project to develop GaN communications. (via DefenseTech)

BAE Systems will build a 160-watt solid-state, gallium nitride (GaN) power amplifier for communications, electronic warfare, and radar applications. The solid-state technology will replace older vacuum tubes, called traveling wave tubes, currently used to produce high-power radio frequency signals.

DARPA’s support will help fund new ways of manufacturing GaN to lower the costs.