ANTENNA COIL AND TRANSMISSION ANTENNA

摘要

In a transmission antenna comprising an antenna coil that has a core around which a coil wire are wound and a capacitor that is connected to the coil wire and forms a series resonant circuit along with the inductance of the antenna coil, the antenna coil has a coupling member comprising a screw that is a small-sized core smaller than the foregoing core and a screw hole that magnetically couples the screw with the foregoing core. The screw hole is a nonmagnetic distance adjusting unit capable of adjusting the distance between the screw and the foregoing core. The antenna coil establishes a resonant frequency by adjusting the amount by which the screw is screwed.