Microwave dielectric composition and method for producing...

Details Microwave dielectric composition and method for producing... Microwave dielectric composition and method for producing...

2005-06-14

2005-06-14

Brunsman, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

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

C501S139000

Reexamination Certificate

active

06905994

ABSTRACT:
A first inventive microwave dielectric composition comprises a ceramic composition represented by AnR4Ti3+nO12+3n, where a is an alkaline earth metal element, R is a rare earth element and characterized in that a case satisfying A=Ba and a case of R=La is excluded and the compositional ratio n=1,2 or 4. A second inventive microwave dielectric composition comprises a ceramic composition represented by AXR4Ti3+XO12+3X, where A is an alkaline earth metal element, R is a rare earth element and characterized in that the compositional ratio X is within a range of 0.5<X<5 (excluding X=1,2, 4). A variety of small microwave dielectric resonators having excellent transmitting/receiving characters can be mass produced inexpensively from that composition.

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Vineis et al, “Microwave Dielectric Properties of Hexagonal Perovskites”, Materials Research Bulletin, vol. 31, Issue 5, May 1996, pp. 431-437.
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Hitoshi Ohsato et al., “Non-linear microwave quality factor change based on the site occupancy of cations on the tungstenbronze-type Ba6−3×R8+2×Ti18O54(R-Rare Earth) solid solutions”,Ceramic Transactions(1999), vol. 100 (Dielectic Ceramic Materials), pp 42-50.
Takashi Okawa et al., “Microwave dielectric properties of BanLa4Ti3+nO12+3nhomologous series”,Japanese Journal of Applied Physics, Part 1, Regular Papers, Short Notes & Review Papers (2001 nen, Sep.), vol. 40, No. 9B, pp 5779-5782.

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