Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
2000-08-14
2002-06-18
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S621000, C501S135000
Reexamination Certificate
active
06406791
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to dielectric compositions for electronic applications, and more particularly to a low loss, substantially lead free dielectric composition that is co-fireable with a ceramic material for forming multilayer ceramic devices.
BACKGROUND OF THE INVENTION
The use of green ceramic tapes has become popular in the manufacture of multilayer ceramic devices for routing electronic circuitry. U.S. Pat. No. 5,801,108 (hereby expressly incorporated by reference herein) addresses various engineering constraints encountered in the manufacture of such devices. Desirably, such devices will exhibit attractive values of “Q”, a dimensionless property in the radio frequency field that is inversely related to the loss factor of a given material (i.e., higher Q values correspond to lower loss).
It is becoming more popular to build such devices by using a ceramic green tape, and building layers on the tape. One way to do this is to employ a paste of a desired material, such as a desired particulated material in a suitable binder. Upon processing, the binder is eliminated and the particulates of the desired material sinter to form a more densified structure. There is a need for improved materials for making such devices, and preferably materials that are substantially free of lead, have relatively flexible processing characteristics, and exhibit an attractive dielectric constant and Q value.
REFERENCES:
patent: 4438214 (1984-03-01), Masuyama et al.
patent: 4992398 (1991-02-01), Huang et al.
patent: 5019306 (1991-05-01), Huang et al.
patent: 5801108 (1998-09-01), Huang et al.
patent: 5821181 (1998-10-01), Bethke et al.
patent: 6207905 (2001-03-01), Taga et al.
Dai Xunhu
Huang Rong-Fong
Blackwell-Rudasill Gwendolyn
Jones Deborah
Koch William E.
Motorola Inc.
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