| 摘要 |
PURPOSE:To miniaturize the device with simple constitution by winding the 1st and 2nd coils to the 1st and 2nd conductors of the same magnetic substance in the same direction so as to incorporate the 1st and 2nd coils. CONSTITUTION:A coil 19 is placed near a headphone jack 15 of a headphone antenna device and the coil 19 consists of three coil parts 20-22 incorporatedly. The coil sections 20-22 are connected between signal electrodes 15a, 15b of a jack 15 and capacitors C1, C2 and a reference electrode 15c of the jack 15 and a ground line. An antenna input terminal 16 is connected to the electrode 15c and input terminals 11, 12 are connected to each of the capacitors C1, C2 via amplifiers 13, 14. Further, the coil 19 has a structure by winding three conductors 24-26 on the coil 19 in the same direction. Then the coil 19 is miniaturized with simple constitution to improve the performance of the headphone antenna.
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