| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an on-vehicle antenna coil or the like capable of coping with miniaturization. <P>SOLUTION: In an antenna coil 10 including a magnetic core member 1 and a conductor 2 wound around the magnetic core member 1, the magnetic core member 1 consists essentially of 54-56 mol% Fe<SB>2</SB>O<SB>3</SB>, 7-14 mol% ZnO and the remainder being MnO substantially, and contains 60-800 ppm Si expressed in terms of SiO<SB>2</SB>, 600-4,000 ppm Ca expressed in terms of CaCO<SB>3</SB>and also 5,000-15,000 ppm SnO<SB>2</SB>and/or ≤8,000 ppm TiO<SB>2</SB>(not including zero), and the magnetic core member has excellent characteristics and high reliability. The SnO<SB>2</SB>and the TiO<SB>2</SB>are combinedly added as subsidiary components, and addition of SnO<SB>2</SB>to the total molar amount of the SnO<SB>2</SB>and the TiO<SB>2</SB>is ≥70% preferably. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
