An electronic transmitter or receiver employing electromagnetic radiation
as a coded signal carrier is described. In the transmitter, the
electromagnetic radiation is emitted from ultra-small resonant structures
when an electron beam passes proximate the structures. In the receiver,
the electron beam passes near ultra-small resonant structures and is
altered in path or velocity by the effect of the electromagnetic
radiation on structures. The electron beam is accelerated to an
appropriate current density without the use of a high power supply.
Instead, a sequence of low power levels is supplied to a sequence of
anodes in the electron beam path. The electron beam is thereby
accelerated to a desired current density appropriate for the transmitter
or receiver application without the need for a high-level power source.