High frequency ceramic compact, use thereof, and method of producing the same
AssigneeMurata Manufacturing Co., Ltd.
InventorsHitoshi Takagi, Mizuki Kono, Tsutomu Tatekawa
Life of this patent
Estimating the term…
Abstract
A high frequency ceramic compact includes Al, Ti and Mn as metallic elements and contains substantially no Al2TiO5 phase as determined by X-ray diffraction analysis and is obtained by firing at about 1310° C. or lower. A preferred high frequency ceramic compact is represented by the following formula and has a Q-value at 10 GHz of 10,000 or more: (100−x−y)AlO3/2−xTiO2−yMnO, wherein x and y are % by mole and x and y satisfy the following conditions: 3.0≦x≦9.0; and 0.1≦y≦1.0. These high frequency ceramic compacts have a relative dielectric constant of 20 or less, a Q-value at 10 GHz of 10,000 or more, and can optionally control the temperature coefficient of resonant frequency around 0 ppm/° C.
Claims18
A high frequency ceramic compact having a Q-value at 10 GHz of at least about 10,000 and comprising Al, Ti and Mn as metallic elements, said compact being represented by the formula
- (100−x−y)AlO3/2−xTiO2−yMnO
- wherein x and y are % by mole,
- 3.0≦x≦9.0, and
- 0.1≦y≦1.0.
A method of producing a high frequency ceramic compact represented by the formula:
- (100−x−y)AlO3/2−xTiO2−yMnO
- wherein x and y are % by mole,
- 3.0≦x≦9.0, and
- 0.1≦y≦1.0,
- said method comprising the steps of:
- providing a mixture of a raw material containing Al, a raw material containing Ti and a raw material containing Mn;
- molding the resulting mixture to form a green compact;
- and
- firing the green compact at a temperature not exceeding about 1310° C.
In an electronic device having a portion comprising a dielectric ceramic body, the improvement which comprises the dielectric ceramic body comprising a high frequency dielectric ceramic compact having a Q-value at 10 GHz of at least about 10,000 and comprising Al, Ti, and Mn as metallic elements, said compact being represented by the formula
- (100−x−y)AlO3/2—xTiO2—yMnO
- wherein x and y are % by mole,
- 3.0≦x≦9.0, and
- 0.1≦y≦1.0.
In an electronic device having a portion which comprises a dielectric ceramic body, the improvement which comprises the dielectric ceramic body comprising a high frequency dielectric ceramic compact having a Q-value at 10 GHz of at least about 10,000 and comprising Al, Ti and Mn as metallic elements, said compact being represented by the formula
- (100−x−y)AlO3/2−xTiO2−yMnO
- wherein x and y are % by mole,
- 3.0≦x≦7.0, and
- 0.1≦y≦0.25.
Dependencies are inferred from the claim text.