Low temperature coefficient dielectric material comprising binar

Details Low temperature coefficient dielectric material comprising binar Low temperature coefficient dielectric material comprising binar

1997-11-17

1999-11-30

Jones, Deborah

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

174258, 174138C, 501135, B23B 1500

Patent

active

059939478

ABSTRACT:
Dielectric materials comprising Ca.sub.2 Ta.sub.2-x Nb.sub.x O.sub.7 have high dielectric constants (Ks) and relatively low temperature coefficients of dielectric constants (TCKs). Preferably, in this composition 0.20.ltoreq.x.ltoreq.1.20 and more preferably 0.32.ltoreq.x.ltoreq.0.40, and particularly preferred is the composite where x is 0.36. With a preferred embodiment where x is about 0.36, the dielectric constant is near 30 and the TCK is about 2 ppm/.degree.C., and the Q of the polycrystalline ceramic at 1 MHz is approximately 5000. The dielectric materials are particularly useful in microwave communications applications

REFERENCES:
patent: 4131479 (1978-12-01), Ichinose et al.
patent: 4542083 (1985-09-01), Cava et al.
patent: 4675302 (1987-06-01), Roy et al.
patent: 5183799 (1993-02-01), Ogushi et al.
patent: 5663528 (1997-09-01), Tanaka et al.
patent: 5827801 (1998-10-01), Tanaka et al.
Cava et al., "Low Temperature Coefficient Bulk Dielectrics in the Ca.sub.2 Nb.sub.2 O.sub.7 --Ca.sub.2 Ta.sub.2 O.sub.7 System", Materials Research Bulletin, vol. 33, No. 4, pp. 527-532, 1998.

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