Patent ID: 6838829

Claim:
A depressed voltage collector for connection to a sub-millimeter electromagnetic wave device containing a cathode and a body generating a rectangular sheet electron beam of electrons traversing into the collector where energy is recovered from the electron beam, said collector comprising: an electrically conductive dissipation cavity; a front wall located on one side of said dissipation cavity having a rectangular aperture to allow passage of said rectangular sheet electron beam into said interior cavity; a conductive reflector electrically and mechanically attached to said interior cavity in said enclosure, opposite said rectangular aperture, positioned at an angle to said incident rectangular sheet electron beam to reflect the electrons into the interior cavity; and means for electrically energizing said collector such that the total voltage difference between said collector and said cathode is significantly less than the voltage difference between said cathode and said device body where said body includes a magnetic field oriented axially to said sheet electron beam, and the strength of said magnetic field is substantially the same in said body as in said collector.