Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1997-07-11
1999-07-13
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333246, 361751, 361748, H01P 1203, H05K 100
Patent
active
059232323
ABSTRACT:
An improved electrical circuit particularly adapted to operate in an extremely thin atmosphere such as above fifty thousand feet. The circuitry of the invention is preferably formed on a circuit board and has an exposed conductive element such as a harmonic filter. This exposed conductive element is encased by a thin dielectric which is preferably formed using a solder mask having dielectric properties which prevent the conductive element from creating a corona during electrical operation in the contemplated thin atmosphere. In the preferred embodiment, the solder mask has a thickness of less than 0.002 inches and exhibits a dielectric strength of at least 1000 V/0.001 inch. The solder mask, for the preferred embodiment, is positioned to cover the conductive element and extends onto the circuit board only minimally.
REFERENCES:
patent: 3725941 (1973-04-01), Stang
patent: 3754198 (1973-08-01), Anghel
patent: 4706050 (1987-11-01), Andrews
patent: 5450286 (1995-09-01), Jacques et al.
patent: 5682674 (1997-11-01), Yamazaki et al.
Europa Thomas M.
Smith Mark D.
Ham Seungsook
Honeywell Inc.
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