Metal working – Method of mechanical manufacture – Electrical device making
Patent
1975-01-15
1976-07-20
Lanham, C.W.
Metal working
Method of mechanical manufacture
Electrical device making
427105, H01P 1100
Patent
active
039698149
ABSTRACT:
A waveguide structure is fabricated by plating a mandrel with a high electrical conductivity metal, such as copper; plasma spray coating the plated mandrel with a selected waveguide body material; forming coupling flanges about the plated mandrel at the ends of the plasma spray formed layer; and removing the mandrel in such a way that the plated metal and plasma spray formed layers remain intact to form a tubular waveguide body with an inner high conductivity liner. The waveguide structure described is a plural cavity bandpass waveguide filter which is fabricated on a mandrel comprising separable sections arranged end to end. Plated iris discs are clamped between the confronting ends of the mandrel sections prior to metal plating plasma spray coating of the mandrel, such that when the mandrel is removed, the iris discs remain intact with and peripherally joined to the filter body liner to define the resonant filter cavities. The invention permits fabrication of lightweight and dimensionally stable high precision waveguide structures from low thermal expansion material which are difficult or impossible to fabricate into such structures by known fabrication techniques.
REFERENCES:
patent: 2724660 (1955-11-01), Ingalls et al.
patent: 2826524 (1958-03-01), Molloy
patent: 3247579 (1966-04-01), Cattermole et al.
patent: 3372471 (1968-03-01), Kuhn
patent: 3697898 (1972-10-01), Blachier et al.
patent: 3713051 (1973-01-01), Kell
Nelson Paul T.
Schafer Clarence E.
Toy Albert
Anderson Daniel T.
Duzan James R.
Lanham C.W.
Nyhagen Donald R.
Oser Edwin A.
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