Linear-beam cavity circuits with non-resonant RF loss slabs
AssigneeHughes Aircraft Company
InventorsIvo Tammaru, Christine G. Thoma, Roger S. Hollister, Robert G. Ripley
Life of this patent
Estimating the term…
Abstract
Lossy slabs are provided in linear-beam tubes such as coupled-cavity TWTs and klystrons to produce a more level tube response over its full operating band, and to eliminate oscillations at the upper cut-off frequency in the TWTs. The slab thicknesses are selected to produce a substantially non-resonant field of about one-quarter wavelength within the slab when the tube is operated within its passband. The slabs are formed from a dielectric material with a conductive mixture of at least about 15%.
Claims17
A linear-beam tube with a smoothed radio frequency (RF) amplification as a function of frequency, comprising:
- an RF source,
- a tube having an interior portion, an exterior portion, and having cylindrical tube walls that surround an electron beam-field wave interaction area, said tube supporting an RF field generated by the RF source within a predetermined operating frequency range,
- a plurality of openings in said tube walls,
- respective slabs of an RF lossy dielectric material lodged in said openings and exposed to the interior portion of said tube, said slabs having a thickness of less than approximately half a wavelength of said predetermined operating frequency range and configured to provide substantially non-resonant RF loss sites to the RF field in the tube within said frequency range.
A linear-beam tube with a smoothed radio frequency (RF) amplification as a function of frequency, comprising:
- an RF source,
- a tube having an interior portion, an exterior portion, and having cylindrical tube walls that surround an electron beam field interaction area, said tube supporting an RF field generated by the RF source within a predetermined operating frequency range,
- a plurality of openings in said tube walls,
- respective slabs of an RF lossy material lodged in said openings, said slabs having respective inner sides that face into and are exposed to the interior portion of said tube and respective outer sides opposite said inner sides, said inner sides of said slabs being substantially tangent to the cylindrical tube walls, said slabs having respective thicknesses within a range of between one eighth wavelength and three eighths wavelength of the predetermined operating frequency range of the RF field in the tube, and
- an electrically conducting surface in close proximity to the outer sides of said slabs.
Dependencies are inferred from the claim text.