Broadband, inverted slot mode, coupled cavity circuit
AssigneeNorthrop Grumman Corporation
InventorALAN J. THEISS
Life of this patent
Estimating the term…
Abstract
A coupled cavity circuit for a microwave electron tube comprises at least two resonant cavities adjacent to each other. An electron beam tunnel passes through the coupled cavity circuit to allow a beam of electrons to pass through and interact with the electromagnetic energy in the cavities. An iris connecting the adjacent cavities allows electromagnetic energy to flow from one cavity to the next. The iris is generally symmetrical about a perpendicular axis of the electron beam tunnel with the iris having flared ends and a central portion connecting the flared ends. The iris shape causes the iris mode passband to be lower in frequency than the cavity mode passband while still providing broadband frequency response.
Claims32
A microwave electron tube, comprising:
- an electron gun for emitting an electron beam;
- a collector spaced from said electron gun, said collector collecting electrons of said electron beam from said electron gun;
- an electron beam tunnel disposed between said electron gun and said collector, said electron beam tunnel defining an electron beam path for said electron beam;
- a slow wave structure disposed along said electron beam path and defining an electromagnetic path along which an electromagnetic signal interacts with said electron beam, said slow wave structure having at least one coupled cavity circuit, said coupled cavity circuit having at least one iris disposed between a first cavity and a second cavity for coupling said electromagnetic signal between said first cavity and said second cavity;
- and
- wherein, said iris is disposed between said electron beam tunnel and a sidewall of said tube, said iris being symmetrical about a perpendicular axis of said electron beam tunnel and having a center portion with a first width and flared ends with a second width that is greater than said first width, said flared ends wrapping partially around said electron beam tunnel.
An extended interaction output circuit for a klystron having at least one coupled cavity circuit and an electron drift tunnel through said cavities, comprising:
- at least one iris disposed between a first cavity and a second cavity of said coupled cavity circuit, said at least one iris coupling an electromagnetic signal between said first cavity and said second cavity;
- and
- wherein, said iris is disposed between said electron beam tunnel and a sidewall of said klystron, said iris being symmetrical about a perpendicular axis of said electron beam tunnel and having a center portion with a first width and flared ends with a second width that is greater than said first width, said flared ends wrapping partially around said electron beam tunnel.
An integral polepiece focusing structure for an RF amplification tube, comprising:
- a slow-wave circuit comprising a plurality of magnetic polepieces and a plurality of electrically conductive non-magnetic plates which are alternatingly and integrally coupled into a laminate structure;
- means for inducing a magnetic field in said slow-wave circuit having lines of flux which flow through said magnetic polepieces;
- an electron beam tunnel provided through said structure, said magnetic polepieces extending substantially entirely to said electron beam tunnel;
- and
- wherein said non-magnetic plates each have a respective cavity, said respective cavity each providing a respective resonant cavity, said magnetic polepieces having an iris, wherein said iris couples an electromagnetic signal between said respective resonant cavities, said iris being symmetrical about a perpendicular axis of said electron beam tunnel and having a center portion with a first width and flared ends with a second width that is greater than said first width, said flared ends wrapping partially around said electron beam tunnel.
A microwave amplification tube having a standard polepiece stack, comprising:
- at least one coupled cavity which includes a plurality of solid members and hollow spacer members which are alternately arrayed to define a plurality of cavities, said solid members and said hollow spacer members each having an aligned aperture through which an electron beam travels;
- means for inducing a magnetic field in said microwave amplification tube to focus said electron beam, said solid members each having a coupling iris through which microwave energy is coupled between said adjacent cavities;
- and
- wherein said coupling iris has triangularly shaped ends that are symmetrical about a perpendicular axis of said aligned aperture, said triangularly shaped ends joined by a central portion, said central portion disposed between said aligned aperture and a sidewall of said tube, said central portion having a first width that is less than a second width of said triangularly shaped ends.
Dependencies are inferred from the claim text.