| 摘要 |
Earphone antenna is provided in which audio signal transmission path is formed by connecting first shield wire of coaxial cable to ground, connecting central conductor of coaxial cable to one of first signal lines, as well as to other one of first signal lines via capacitor which becomes high impedance in frequency band of audio signal and low impedance in frequency range of high frequency signal, and by connecting second signal line and grounding wire respectively to first signal lines via high frequency choke which becomes low impedance in frequency range of audio signal and high impedance in frequency range of high frequency signal; and wherein by connecting ground to second shield wire which covers external of coaxial cable, second signal line and grounding wire, sleeve antenna is provided which includes earphone cable and second shield wire. |
