Hitachi Metals, Ltd.

Tomotsugu Kato

Hiroyuki Aoyama

Masayuki Gonda

Hideto Mikami

A chip antenna comprising a magnetic substrate comprising Z-type ferrite or Y-type ferrite as a main phase and having a through-hole extending linearly along a center axis, and a conductor penetrating the through-hole, the magnetic phase having a c-axis substantially parallel or perpendicular to the through-hole.

Chip antenna and its production method, and antenna apparatus and communications apparatus comprising such chip antenna

The ferrite sintered body of hexagonal Z-type ferrite contains 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, the remainder being FeOas its main components and also contains 0.05% to 1.0% by mass of Li, based on the main components, in terms of LiCOand 0.05% to 0.5% by mass of Si, based on the main components, in terms of SiO. Further, the rate of a spinel-type ferrite phase to entire phases including a Z-type ferrite phase and the spinel-type ferrite phase is 5% or less in terms of an area ratio in the cross section of the sintered body.

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Saitama-ken, Japan

Tomotsugu Kato