Title:
MICROWAVE DIELECTRIC CERAMIC COMPOSITION
Document Type and Number:
WIPO Patent Application WO/1999/062839
Kind Code:
A1
Abstract:
A microwave dielectric ceramic composition exhibiting excellent relative permittivity ($g(e)) and high Qf-value, enabling the temperature coefficient of resonance frequency to be easily adjusted, and being best suited for a filter having cavities made of, e.g., iron or copper exhibiting a large temperature coefficient of resonance frequency. The ceramic is of a BaO-TiO¿2?-Nd¿2?O¿3?-Sm¿2?O¿3? type wherein Nd¿2?O¿3? is partly substituted by Bi¿2?O¿3? and Nd¿2?O¿3? is partly substituted by Ln¿2?O¿3? (where Ln is La or Pr) to accomplish the properties of $g(e) of 90 to 93.5, Qf of 6800 to 7000 GHz and $g(t)f of 2.3 to 4.0 ppm/°C. This makes it possible to impart favorable electric characteristics to resonance cavities of various materials and sizes.
More Like This:
Inventors:
ANDO RYOUICHI DI
SHIMADA TAKESHI (JP)
KAGEYAMA KEISUKE (JP)
SHIMADA TAKESHI (JP)
KAGEYAMA KEISUKE (JP)
Application Number:
PCT/JP1998/002466
Publication Date:
December 09, 1999
Filing Date:
June 04, 1998
Export Citation:
Assignee:
SUMITOMO SPEC METALS (JP)
ANDO SOYOKO HF (JP)
SHIMADA TAKESHI (JP)
KAGEYAMA KEISUKE (JP)
ANDO SOYOKO HF (JP)
SHIMADA TAKESHI (JP)
KAGEYAMA KEISUKE (JP)
International Classes:
C04B35/46; C04B35/462; C04B35/468; H01B3/12; H01P7/06; (IPC1-7): C04B35/46; C04B35/50; H01B3/12
Foreign References:
| JPH0369560A | 1991-03-25 | |||
| JPS55131901A | 1980-10-14 | |||
| JPH03192606A | 1991-08-22 | |||
| JPH04265269A | 1992-09-21 | |||
| JPH0817243A | 1996-01-19 | |||
| JPH08335810A | 1996-12-17 | |||
| JPH0597508A | 1993-04-20 |
Other References:
See also references of EP 1092694A4
Attorney, Agent or Firm:
Oshida, Yoshihisa (3-12 Ginza 3-chom, Chuou-ku Tokyo, JP)
Download PDF:
Previous Patent: CEMENT ADMIXTURE, CEMENT COMPOSITIONS AND CEMENT STRUCTURES
Next Patent: MICROWAVE DIELECTRIC CERAMIC COMPOSITION
Next Patent: MICROWAVE DIELECTRIC CERAMIC COMPOSITION