Earphone antenna, composite coil used therefor coaxial cable and radio device with the earphone antenna

摘要

An earphone antenna in which a balun is connected to one side and the other side having an audio/high-frequency dual-function signal connecting the earphone unit via a loading coil and wireless equipment connected to the balun, the loading coil selecting low impedance for fundamental frequency and selecting to obtain high impedance for higher frequencies, in order to integrate earphone and antenna.