Low-fire microwave dielectric compositions
AssigneeNational Science Council of Republic of China
InventorsJau-Ho Jean, Shih-Chun Lin
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Abstract
The present invention relates to a dielectric composition which can be densified at a temperature no higher than 1000° C. and can provide ceramic products with a dielectric constant of 20 to 45 and a quality constant of 1000 to 1300 at 7 GHz. The dielectric composition comprises 20-90 vol % borosilicate glass and 10-80 vol % TiO2 ceramic. Multilayered microwave dielectric ceramic elements can be prepared by mixing the composition of the present invention with an organic solvent, a polymer binder and a plasticizer, forming a green sheet from the mixture by tape casting, screen-printing and laminating the green sheet, and then cofiring the multilayer ceramic laminate with a high electrical conductivity metal, such as Ag and Cu.
Claims14
A dielectric composition comprising:
- (a) 40-90 vol % of a glass phase which is borosilicate glass;
- and
- (b) 10-60 vol % of a ceramic phase which is anatase form of TiO2 ceramic whereby said composition forms a densified high dielectric material having a relative sintered density of at least about 95% when densified at a temperature of 850° C.-900° C. for 15-16 minutes.
Dependencies are inferred from the claim text.