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US 12,707,561 B2Granted
Magnetic ceramic substrate, substrate manufacturing method, and circulator
AssigneeMitsubishi Electric Corporation
InventorsMotoki Masaki, Takumi Nagamine, Toshiyuki Moribayashi, Tetsuya Ueda, Hironobu Shibata
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Abstract
A magnetic ceramic substrate includes a base material made of magnetic ceramic and a conductor pattern formed to be in contact with a surface of the base material. The surface of the base material is smooth, and the conductor pattern contains a metal conductor and amorphous glass. A circulator includes the magnetic ceramic substrate.
Claims10
A magnetic ceramic substrate comprising:
- a base material made of magnetic ceramic that is garnet-type ferrite;
- and
- a conductor pattern formed to be in contact with a surface of the base material,
- wherein a value of Ra is 0.01 or more and 0.5 or less where Ra is a smoothness of the surface of the base material, and
- wherein the conductor pattern is made of a metal conductor formed of Ag and amorphous glass that does not crystallize.
2 more elements
A magnetic ceramic substrate manufacturing method of manufacturing a magnetic ceramic substrate, the magnetic ceramic substrate manufacturing method comprising:
- mirror-polishing a surface of a base material made of magnetic ceramic that is garnet-type ferrite such that a value of Ra is 0.01 or more and 0.5 or less where Ra is a smoothness of the surface of the base material;
- applying a conductor paste made of a metal conductor formed of Ag and amorphous glass that does not crystallize by thick-film printing to the mirror-polished surface;
- drying the conductor paste applied by thick-film printing;
- and
- baking the dried conductor paste to the surface of the base material.
2 more elements
Dependencies are inferred from the claim text.