Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1994-01-05
1995-03-28
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
C04B 3546
Patent
active
054017025
ABSTRACT:
A microwave dielectric ceramic composition exhibiting superior high frequency characteristics, particular temperature coefficients suitable for materials for cellular phones, which composition comprises approximately 0.1 to approximately 0.3 mole fraction of CaTiO.sub.3 having a negative temperature coefficient and approximately 0.9 to approximately 0.7 mole fraction of (Li.sub.1/2 Nd.sub.1/2)TiO.sub.3 having a positive temperature coefficient, and optionally a predetermined amount of an additive, preferably Nd.sub.2 O.sub.3, Li.sub.2 CO.sub.3, Na.sub.2 CO.sub.3 and CeO.sub.2.
REFERENCES:
patent: 3660124 (1972-05-01), Yoshioka et al.
patent: 4489168 (1984-12-01), Wank et al.
Ba(M.sub.r1/3 Ta.sub.2/3)O.sub.3 Ceramics with Ultra-Low Loss at Microwave Frequencies, K. Matsumoto et al., pp. 118-121, IEEE, 1986 no month.
Microwave Characteristics of (Zr, Sn)TiO.sub.4 and BaO-PbO-Nd.sub.2 O.sub.3 -TiO.sub.2 Dielectric Resonators, K. Wakino et al., Journal of the American Ceramic Society, vol. 67, No. 4, pp. 278-281, 1984 no month.
Material Produces Small Resonators with High Dielectric Constant, Junichi Kato, JEE, Sep. 1991, pp. 114-118.
Resonant Modes of a Dielectric Rod Resonator Short-Circuited at Both Ends by Parallel Conducting Plates, Yoshio Kobayashi et al., IEEE Transactions on Microwave Theory and Techniques, vol. MTT-28, No. 10, Oct. 1980, pp. 1077-1085.
Chang Kwang H.
Hong Suk K.
Kim Kyung Y.
Yun Jung R.
Bell Mark L.
Jones Deborah
Korea Institute of Science and Technology
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