| 摘要 |
<p>A transmission antenna comprises an armature coil equipped with a winding-wound core and a capacitor connected to the winding for forming a series resonance circuit with the inductor of this antenna coil. This antenna coil comprises a screw serving as a core smaller than the winding-wound core and a coupling member which magnetically couples the screw with the core and has a screw hole that is a non-magnetic distance adjusting section which enables the adjustment of the distance between the core and the screw and sets a resonance frequency by screw-in amount of the screw.</p> |
