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US 4,053,850 AGranted
Magnetron slot mode absorber
AssigneeVarian Associates, Inc.
InventorsGeorge Kenneth Farney, William Allen Gerard
Life of this patent
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Abstract
In a coaxial magnetron the resonant circuit interacting with the electrons is coupled to a stabilizing resonator operating in a mode with circular electric field. The coupling is thru a set of slots in the intervening wall. Undesirable resonances localized in the slots are damped by lossy material at the ends of the slots. Undesirable damping of the cavity mode is prevented by a conducting shield covering exposed area of the lossy material and spaced into the cavity away from the slots.
Claims14
In an electronic oscillator:
- circuit means adapted to interact with electrons at a selected frequency to generate electromagnetic energy,
- cavity means adapted to resonate at said frequency,
- a conductive wall forming a common part of the electrical boundaries of said circuit means and said cavity means,
- at least one slot in said wall for coupling electromagnetic fields of said circuit means and said cavity means,
- lossy material near said slot,
- a conductive shield between said lossy material and the interior of said cavity means for shielding said lossy material from fields of said cavity means,
- the portion of said shield near said slot being spaced from said wall by a distance larger than the width of said slot.
4 more elements
Dependencies are inferred from the claim text.