Metal working – Method of mechanical manufacture – Electrical device making
Patent
1996-08-29
1998-06-30
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29 2535, H01P 1100
Patent
active
057715670
ABSTRACT:
Methods of fabricating a porous ceramic composite having voltage-variable dielectric properties. The composite is made as follows. A polycrystalline ferroelectric powder, which is a ferroelectric perovskite such as barium strontium titanate, for example, is provided. The powder, a binder and a filler are then mixed in water to form a slurry. The powder-binder-filler slurry is then dried. The dried powder-binder-filler slurry is granulated. The granulated powder-binder-filler is pressed into a die. The binder and filler are then burned out to form a fragile porous ash-like structure. The porous structure is then sintered to form porous ceramic parts. The porous ceramic parts are then machined tiles. The machined porous tiles may then be tested for microwave properties. Fabrication methods for producing porous ferroelectric ceramic-polymer composite tiles or subaperture blanks and continuous transverse stub electronically scanned antenna plates or subapertures are also disclosed.
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Chen William W.
Dougherty Thomas Kirk
Harris Norman H.
Lee Florentino V.
Pierce Brian M.
Alkov Leonard A.
Arbes Carl J.
Lenzen, Jr. Glenn H.
Raytheon Company
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