A device couples energy from an electromagnetic wave to charged particles in a beam. The device includes a micro-resonant structure and a cathode for providing electrons along a path. The micro-resonant structure, on receiving the electromagnetic wave, generates a varying field in a space including a...http://www.google.es/patents/US7557365?utm_source=gb-gplus-sharePatente US7557365 - Structures and methods for coupling energy from an electromagnetic wave
Structures and methods for coupling energy from an electromagnetic wave
