Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1996-08-20
1998-11-10
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333222, 333227, 174 5051, H01P 120, H01P 704
Patent
active
058349936
ABSTRACT:
A simple joining process for members of passive microwave structures is described which reduces passive intermodulation. The process forms an aperture in a first member and forms a second member to have dimension which exceeds the aperture dimension by a dimension differential. The members are joined by initially causing them to have a temperature differential that is sufficient to permit the second member to be positioned across the aperture. The dimension differential is selected to generate mutually-induced radial stresses in the members, after the temperature differential is removed, which enhance the metal-to-metal contact between the members and, thereby, improve passive intermodulation (PIM) performance. Preferably, the dimension differential is selected to cause the second member to elastically buckle and exert a buckling stress against the first member. Additional interface structures are provided to resist operational axial forces, e.g., vibration, that tend to dislodge the members.
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Campbell Ronald M.
Coleman Lee E.
Grall Michael J.
Grunebach Georgann S.
Gudmestad Terje
Ham Seungsook
Hughes Electronics Corporation
Sales Michael W.
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