The four-layer diode was the key to William Shockley's plan to revolutionize AT&T's phone system. It was a great device in theory, but not in practice -- at least not at the time when Shockley ...

The 3.7–4.2 GHz band (C-band) is a prime band for many enhanced spectrum-based services due to its desirable coverage, capacity, and propagation characteristics. In 2020, the Commission ...