The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 19, 1995
Filed:
Nov. 28, 1994
Yasushi Kose, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention provides a bonding structure between a dielectric substrate made of a dielectric material and a packaging substrate made of a heat conductive material involved in microwave integrated circuits. Both the dielectric and heat conductive materials have different coefficients of thermal expansions. The dielectric substrate has a top surface formed thereon with a top metallization pattern constituting impedance matching circuits and a bottom surface being bonded through a soldering agent to the packaging substrate. The bottom surface of the dielectric substrate has a bottom metallization pattern being selectively formed in a predetermined area thereon so that the soldering agent is applied only on the bottom metallization pattern to bond the dielectric and packaging substrates with each other. The bottom metallization pattern may be the same as the top metallization pattern. Alternatively, the bottom metallization pattern may comprise a plurality of almost rectangles aligned in matrix on the bottom surface of the dielectric substrate.