Surface coated RF circuit element and method

Details Surface coated RF circuit element and method Surface coated RF circuit element and method

1991-07-29

1992-07-14

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

419 9, 419 19, 419 36, 419 54, 419 57, 428433, 428553, G22F 300

Patent

active

051302063

ABSTRACT:
Extra loss is introduced in coupled cavity and klystron RF circuits by applying a surface coating to selected parts of circuit elements used in the circuits. The coating is applied in the form of a slurry, which is then sintered. The slurry comprises a mixture of an iron-base powder (such as a stainless steel) and a dielectric glass ceramic, suspended in a binder dissolved in a solvent. Circuits with the loss coating are easier to match than by other prior art techniques. The loss coating of the invention reduces the fabrication cost of coupled-cavity traveling wave tubes, while improving the performance by minimizing the gain ripple. Higher average power operation is possible, due to elimination of loss buttons previously employed in the prior art.

REFERENCES:
patent: 4052530 (1977-10-01), Fonzi
patent: 4594294 (1986-06-01), Eichen et al.

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