| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna element with stable characteristics without dispersion in the resonance frequency. <P>SOLUTION: Looping back a conductor wire forming a helical coil at a tip of the helical coil forms a straight line part 14 whose free end is directed to a base end on an axial center of the helical coil. The helical coil is fixed by a bobbin 16 being insert-formed by an insulating resin and a hollow cylinder part 16a is formed to the bobbin 16 for facing the straight line part 14. The straight line part 14 is at least partially supported with two ribs 16b, 16b placed at the inner face of the cylinder part 16a of the bobbin 16 in the axial direction and whose thickness in a direction around the axial center is thinner at least at their inner tip. <P>COPYRIGHT: (C)2004,JPO |
