Ceramic composition and method

Details Ceramic composition and method Ceramic composition and method

2005-05-31

2005-05-31

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C333S219100

Reexamination Certificate

active

06900150

ABSTRACT:
A ceramic material suitable for use as a microwave band filter for telecommunications equipment comprises oxides of titanium, barium, neodymium, samarium, and optionally, bismuth, and containing, on an elemental weight basis: about 28 to about 31 weight % titanium, about 19 to about 21 weight % barium, about 11 to about 18 weight % samarium, about 7 to about 13 weight % neodymium, up to about 3 weight % of bismuth, and the remainder substantially being oxygen. The ceramic compositions have a resonant frequency, f, in the range of about 2000 MHz to about 2300 MHz, a quality factor, Q, of at least about 4000, a dielectric constant, K, in the range of about 50 to about 70, and a temperature coefficient of resonant frequency, Tf, in the range of about 0 ppm to about +20 ppm. Calcined metal oxide powders useful for preparing the microwave ceramic materials, a method of making the ceramic materials, and devices containing the ceramic materials are also described.

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