Ceramic composition for microwave dielectric

Details Ceramic composition for microwave dielectric Ceramic composition for microwave dielectric

1992-07-02

1993-08-24

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

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

C04B 3546

Patent

active

052388875

ABSTRACT:
Disclosed herein is a ceramic composition which gives a microwave dielectric having a permittivity and unloaded Q in a practical range and a small temperature coefficient (.tau.f) in the neighborhood of zero of resonance frequency owing to the controlled amount of ZnO and Ta.sub.2 O.sub.5 added. The .tau.f value may be positive or negative in the neighborhood of zero according to need. The ceramic composition comprises a principal component represented by (BaO-3.7TiO.sub.2).xZnO, where x is in the range of 15.ltoreq.x.ltoreq.17 wt % and a secondary component containing 2-6 wt % Ta.sub.2 O.sub.5 and not more than 1 wt % MnO.sub.2 based on the amount of the principal component. The ceramic composition may also contain BaO-3.8TiO.sub.2, 12-16 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5, or contain BaO-3.6TiO.sub.2, 17-19 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5.

REFERENCES:
patent: Re29484 (1977-11-01), Utsumi et al.
patent: 4487842 (1984-12-01), Nomura et al.
patent: 4803591 (1989-02-01), Miyashita et al.
patent: 4968649 (1990-11-01), Tsurumi et al.

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