| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna capable of obtaining an stable inductance, and to particularly provide an antenna that uses a ferrite core made of a ferrite material whose magnetic permeability change to change of stress is small. <P>SOLUTION: The antenna comprises a coil and the ferrite core around which the coil is wound. The ferrite core is made of a ferrite material obtained by adding Bi<SB>2</SB>O<SB>3</SB>by mass of ≥0.2% and ≤6% to a material, wherein when a composition formula is x(Li<SB>0.5</SB>Fe<SB>0.5</SB>)O-yZnO-z(Mn, Fe)<SB>2</SB>O<SB>3</SB>and a=Mn/(Mn+Fe), x, y, z and a in the composition formula and a condition satisfy 0.18≤x≤0.30, 0.20≤y≤0.30, 0.48≤z≤0.53, 0.01≤a≤0.25, and x+y+z=1. <P>COPYRIGHT: (C)2008,JPO&INPIT |
