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EP0412440A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Dielectric ceramic for microwave applications

Assignee: Oki Electric Industry Co Ltd
•
Filing: 1990-08-02
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Granted: —
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Expires: 2010-08-02
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Abstract

Abstract A dielectric ceramic for microwave applications is comprised of: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 } where X, Y, Z lie in the ranges: 11.0 ≦ X ≦ 22.0; 60.0 ≦ Y ≦ 75.0; and 6.0 ≦ Z ≦ 28.0 (X + Y + Z = 100) expressed in mole %, and 0 < W₁ ≦ 0.35; 0 < W₂ < 1; and 0 < (1 - W₁ - W₂) < 1; where W₁, W₂ and (1-W₁-W₂) are mole ratios. MnO₂ or Al₂O₃ may also be added. Alternatively, a dielectric ceramic may comprise: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 }.V Bi₂O₃ where X, Y, Z and V lie in the ranges: 11.5 ≦ X ≦ 21.0; 60.0 ≦ Y ≦ 76.0; 6.5 ≦ Z ≦ 26.0; and 0.1 ≦ V ≦ 5.0 (X + Y + Z + V = 100), expressed in mole %, and 0 < W₁ < 1; 0 < W₂ < 1; 0 < (1 - W₁ - W₂) < 1, where W₁, W₂ and (1-W₁-W₂) are mole ratios. MnO₂, CeO₂, PbO, or Al₂O₃ may also be added. The dielectric ceramic of the invention has a high dielectric constant ε r and a high unloaded Q (Q u ), and moreover, the temperature coefficient τ f of the resonant frequency can be varied over a wide range by varying the composition.

Inventors

  • 👤 Hosaku C/O Oki Electric Industry Co. Ltd. Sato
  • 👤 Kazutoshi C/O Oki Electric Ind. Co. Ltd Ayusawa
  • 👤 Toru C/O Oki Electric Industry Co. Ltd. Arai

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 18:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; C04B35/4688

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 99 words
A dielectric ceramic for microwave applications comprised of barium oxide (BaO), titanium dioxide (TiO₂), samarium oxide (Sm₂O₃), lanthanum oxide (La₂O₃) and neodymium oxide (Nd₂O₃) represented by the formula: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 } where X, Y, Z lie in the ranges: 11.0 ≦ X ≦ 2.0 60.0 ≦ Y≦ 75.0 6.0 ≦ Z ≦ 28.0 X + Y + Z = 100 expressed in mole %, and 0 < W₁ ≦ 0.35 0 < W₂ < 1 0 < (1 - W₁ - W₂) < 1 where W₁, W₂ and (1-W₁-W₂) are mole ratios.
Claim 2
Dependent Claim 99 words
A dielectric ceramic for microwave applications comprised of barium oxide (BaO), titanium dioxide (TiO₂), samarium oxide (Sm₂O₃), lanthanum oxide (La₂O₃) and neodymium oxide (Nd₂O₃) represented by the formula: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 } where X, Y, Z lie in the ranges: 11.0 ≦ X ≦ 2.0 60.0 ≦ Y≦ 75.0 6.0 ≦ Z ≦ 28.0 X + Y + Z = 100 expressed in mole %, and 0 < W₁ ≦ 0.35 0 < W₂ < 1 0 < (1 - W₁ - W₂) < 1 where W₁, W₂ and (1-W₁-W₂) are mole ratios.
Claim 3
Dependent Claim 36 words
A dielectric ceramic according to Claim 1, in which, to the main constituents as recited in Claim 1, MnO₂ is also added, as a supplementary constituent, to the extent of no more than 3 wt %.
Claim 4
Dependent Claim 48 words
A dielectric ceramic according to Claim 1, in which, to the main constituents as recited in Claim 1, Al₂O₃ has also been added, as a supplementary constituent, to the extent of no more than 3 wt %, this corresponding to 0.0563 mole per mole of the main constituents.
Claim 5
Dependent Claim 113 words
A dielectric ceramic for microwave applications comprised of barium oxide (BaO), titanium dioxide (TiO₂), samarium oxide (Sm₂O₃), lanthanum oxide (La₂O₃), neodymium oxide (Nd₂O₃) and bismuth oxide (Bi₂O₃), represented by the formula: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 }.V Bi₂O₃ where X, Y, Z and V lie in the ranges: 11.5 ≦ X ≦ 21.0 60.0 ≦ Y ≦ 76.0 6.5 ≦ Z ≦ 26.0 0.1 ≦ V ≦ 5.0 X + Y + Z + V = 100 expressed in mole %, and 0 < W₁ < 1 0 < W₂ < 1 0 < (1 - W₁ - W₂) < 1, where W₁, W₂ and (1-W₁-W₂) are mole ratios.
Claim 6
Dependent Claim 113 words
A dielectric ceramic for microwave applications comprised of barium oxide (BaO), titanium dioxide (TiO₂), samarium oxide (Sm₂O₃), lanthanum oxide (La₂O₃), neodymium oxide (Nd₂O₃) and bismuth oxide (Bi₂O₃), represented by the formula: X BaO.Y TiO₂.Z {(Sm₂O₃) 1-W1-W2 (La₂O₃) W1 (Nd₂O₃) W2 }.V Bi₂O₃ where X, Y, Z and V lie in the ranges: 11.5 ≦ X ≦ 21.0 60.0 ≦ Y ≦ 76.0 6.5 ≦ Z ≦ 26.0 0.1 ≦ V ≦ 5.0 X + Y + Z + V = 100 expressed in mole %, and 0 < W₁ < 1 0 < W₂ < 1 0 < (1 - W₁ - W₂) < 1, where W₁, W₂ and (1-W₁-W₂) are mole ratios.
Claim 7
Dependent Claim 32 words
A dielectric ceramic according to Claim 4, in which, to the main constituents as recited in Claim 4, MnO₂ is also added to the extent of no more than 2 wt %.
Claim 8
Dependent Claim 50 words
A dielectric ceramic according to Claim 4, in which, to the main constituents as recited in Claim 4, cerium oxide (CeO₂) is also added, as a supplementary constituent, to the extent of no more than 5 wt %, this amount corresponding to 0.0606 mole per mole of the main constituents.
Claim 9
Dependent Claim 49 words
A dielectric ceramic according to Claim 4, in which, to the main constituents as recited in Claim 4, lead oxide (PbO) is also added, as a supplementary constituent, to the extent of no more than 5 wt %, this corresponding to 0.0463 mole per mole of the main constituents.
Claim 10
Dependent Claim 49 words
A dielectric ceramic according to Claim 4, in which, to the main constituents as recited in Claim 4, aluminum oxide (Al₂O₃) is also added, as a supplementary constituent, to the extent of no more than 3 wt %, this corresponding to 0.0609 mole per mole of the main constituents.

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