Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-12-19
1991-06-18
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29851, 29825, 29840, H05K 300
Patent
active
050239937
ABSTRACT:
The present invention incorporates a specially-designed low-pass filter into the feedthrough of a monolithic microwave integrated circuit (MMIC) to provide compensation for discrepancies from the impedance required for an MMIC package to be matched to a transmission line. The compensation allows all parameters to be adjusted and the complete filter to be printed.
The main features of the invention include minimum width for the under-wall conductor and brazing metallization, two open-circuited stubs at the package-die interface for wire bonding ease, and metal-filled vias connecting the ground plane base and the lid sealing ring to bring the lid sealing ring to RF ground.
The present invention also includes a method for designing the desired feedthrough the obviates the need for scale-model feedthrough design before printing, a prior art method that requires precision in the scale model. An electrical model of a feedthrough is first derived. The electrical model is then adjusted according to the parameters desired for a new, compensated feedthrough using any known method, including software such as touchstone. Finally, the new feedthrough is fabricated based upon the adjusted electrical model.
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patent: 4626805 (1986-12-01), Jones
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patent: 4906802 (1990-03-01), Castleman
patent: 4925723 (1990-05-01), Bujatti et al.
Bettner, Hundley and Salisbury, A Low Cost "Monolithic-Monolithic" Gain Module, Microwave Journal, (Dec. 1987), p. 109.
Bryant David P.
Echols P. W.
Grumman Aerospace Corporation
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