| 摘要 |
PURPOSE: A portable accessory device is provided to solve a death-grip problem of the hand-held device by using a portable accessory without changing a hand-held device like a smartphone. CONSTITUTION: An induction type signal amplification circuit(400) includes an antenna unit(430), a capacitive matching unit(410), and an impedance matching unit(420). The antenna unit transmits or receives a radio wave. The capacitive matching unit matches with an antenna embedded in a hand-held device. The impedance matching unit connects the antenna unit and the capacitive matching unit. The impedance matching unit transmits the radio wave. [Reference numerals] (310,430) Antenna unit; (410) Capacitive combining unit; (420) Impedance matching unit; (421) Impedance line;
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