Microwave dielectric ceramic composition and preparing method th

Details Microwave dielectric ceramic composition and preparing method th Microwave dielectric ceramic composition and preparing method th

1994-08-18

1995-10-10

Brunsman, David

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C04B 3526, C04B 3546

Patent

active

054570760

ABSTRACT:
A ceramic composition having a high value .epsilon.r while maintaining Qu and .tau.f each in a range of practical characteristic. The present invention is applicable to dielectric resonators and impedance matching of various kinds of microwave circuits. The ceramic composition comprises Ba.sub.1-x Sr.sub.x (Zn.sub.1/3 Nb.sub.2/3)O.sub.3 (in which 0.6.ltoreq..times..ltoreq.1.0) as the main ingredient, to which TiO.sub.2 is incorporated by 0.01 to 1 parts by weight based on 100 parts by weight of the main ingredient. The ceramic composition may have a Qu value of 2000 to 2900 (at 4.5 GHz), relative dielectric constant of 39 to 42, and a temperature constant of resonance frequency (.tau.f) in the range of -8 to +10 ppm/.degree.C. The ceramic composition may not contain Sr.sub.5 Nb.sub.4 O.sub.15 or Ba.sub.4 Nb.sub.2 O.sub.9. It may index for the regularity of the B site ingredient of 7-9.times.10.sup.-2. The ceramic composition may be prepared by calcination, sintering, and an annealing treatment after sintering. A calcination atmosphere and a sintering atmosphere may be ZnO atmosphere.

REFERENCES:
patent: 4621067 (1986-11-01), Kitoh et al.
Derwent Abstract--Jap. 52-118599 (Oct./1977).
Derwent Abstract--Jap. 2-129065 (May/1990).
Chem. Abstracts 88:114249--Jap. 52-118599 (Oct. 1977).
Chem. Abstracts 113:203301--Jap. 2-129065 (May 1990).

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