Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1998-03-20
2000-03-14
Reichard, Dean A.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
H01J 500
Patent
active
060375396
ABSTRACT:
The present invention provides a light-weight, hermetic coaxial radio-frequency (RF) interconnection having an electrically conductive outer housing made of aluminum or an aluminum alloy, a central electrical conductor made of ferrous or non-ferrous material, and a cylinder of dielectric material comprising a low-melting-temperature, high-thermal-expansion aluminophosphate glass composition for hermetically sealing between the aluminum-alloy outer housing and the ferrous or non-ferrous center conductor. The entire RF interconnection assembly is made permanently hermetic by thermally fusing the center conductor, glass, and housing concurrently by bringing the glass to the melt point by way of exposure to an atmospheric temperature sufficient to melt the glass, less than 540.degree. C., but that does not melt the center conductor or the outer aluminum or aluminum alloy housing. The composition of the glass used is controlled to provide a suitable low dielectric constant so that an appropriate electrical characteristic impedance, for example 50 ohms, can be achieved for an electrical interconnection that performs well at high radio frequencies and also provides an interconnection maintaining a relatively small physical size.
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Brow Richard K.
Kilgo Riley D.
Kovacic Larry
Klavetter E. A.
Reichard Dean A.
Sandia Corporation
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