Title:
DIELECTRIC PORCELAIN COMPOSITION FOR HIGH-FREQUENCY, DIELECTRIC RESONATOR, DIELECTRIC FILTER, DIELECTRIC DUPLEXER AND APPARATUS FOR COMMUNICATION INSTRUMENT
Document Type and Number:
Japanese Patent JP3575336
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a porcelain composition having a relatively high relative permittivity and a high value of Q and capable of controlling the temperature coefficient of resonance frequency by including a rare earth element, Mg, Ta, Sb, Ti, Ca or Sr, having a specific composition and composing a main crystal of a perovskite type crystal phase.
SOLUTION: A rare earth element is at least one kind of Y, La, Pr, Nd and Sm. The composition has a composition represented by the formula xMTiaO1+2a-yLn(Mg2/3Ta1/3)bO(3+3b)/2-zLm(Mg2/3Sb1/3)cO(3+3C)/2 [Lm and Ln are each a rare earth element; M is Ca or Sr; x, y and z are each mol%]. In Fig 1, a, b and c are each within the range of 0.950≤a≤1.050; 0.900≤b≤1.050 and 0.900≤c≤1.050. x, y and z are each located on lines or the interior of a polygon connecting point A (x=75, y=0, z=25), point B (x=55, y=0, z=45), point C (x=55, y=45, z=0) and point D (x=75, y=25, z=0). Good characteristics are obtained in a dielectric resonator, etc.
Inventors:
Tsutomu Tachikawa
Hitoshi Takagi
Hitoshi Takagi
Application Number:
JP17571599A
Publication Date:
October 13, 2004
Filing Date:
June 22, 1999
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
C04B35/46; H01B3/12; H01P1/213; H01P7/10; (IPC1-7): C04B35/46; H01B3/12; H01P1/213; H01P7/10
Domestic Patent References:
| JP2001010860A | ||||
| JP2000233970A | ||||
| JP2000185970A | ||||
| JP8133834A |