Title:
DIELECTRIC CERAMIC AND RESONATOR
Document Type and Number:
WIPO Patent Application WO/2011/052720
Kind Code:
A1
Abstract:
Disclosed is a dielectric ceramic which is capable of stably having a desired relative dielectric constant (εr), while having high Q value and good temperature coefficient of the resonance frequency.
Specifically disclosed is a dielectric ceramic which contains lanthanum, magnesium, calcium and titanium, and when the compositional formula of the components is expressed as αLa2Ox·βMgO·γCaO·δTiO2 (wherein 3 ≤ x ≤ 4), the molar ratios α, β, γ and δ satisfy the formulae below. The dielectric ceramic also contains aluminum in an amount of 5% by mass or less (excluding 0% by mass) in terms of oxides relative to 100% by mass of the above-mentioned components.
0.160 ≤ α ≤ 0.270
0.050 ≤ β ≤ 0.100
0.260 ≤ γ ≤ 0.390
0.360 ≤ δ ≤ 0.430
α + β + γ + δ = 1
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Inventors:
TOYODA SATOSHI (JP)
HIRAHARA SEIICHIROU (JP)
MURAKAWA SHUNICHI (JP)
KOMATSU TSUYOSHI (JP)
HIRAHARA SEIICHIROU (JP)
MURAKAWA SHUNICHI (JP)
KOMATSU TSUYOSHI (JP)
Application Number:
PCT/JP2010/069278
Publication Date:
May 05, 2011
Filing Date:
October 29, 2010
Export Citation:
Assignee:
KYOCERA CORP (JP)
TOYODA SATOSHI (JP)
HIRAHARA SEIICHIROU (JP)
MURAKAWA SHUNICHI (JP)
KOMATSU TSUYOSHI (JP)
TOYODA SATOSHI (JP)
HIRAHARA SEIICHIROU (JP)
MURAKAWA SHUNICHI (JP)
KOMATSU TSUYOSHI (JP)
International Classes:
H01B3/12; C04B35/46; H01P7/10
Foreign References:
| JP2002167274A | 2002-06-11 | |||
| JPH0676633A | 1994-03-18 | |||
| JPH0877829A | 1996-03-22 | |||
| JP2008266121A | 2008-11-06 | |||
| JPH07201644A | 1995-08-04 | |||
| JPH08295561A | 1996-11-12 | |||
| JP2000233970A | 2000-08-29 | |||
| JP2001163665A | 2001-06-19 | |||
| JPS62249306A | 1987-10-30 | |||
| JPS61128411A | 1986-06-16 |
Other References:
See also references of EP 2495225A4
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