US Patent 11323796 Wireless earphone

A wireless earphone includes: a sensor which serves as both of an antenna configured to transmit and receive a radio signal wirelessly to and from an external device and a pad configured to receive an input manipulation of a wearer; a radio circuit configured to perform various kinds processing relating to the radio signal; and a control circuit configured to perform various kinds processing on the basis of the input manipulation. The wireless earphone further includes a capacitance element connected between the radio circuit and the sensor and between the control circuit and the sensor, the capacitance element being connected to a ground conductor in series to pass only the radio signal.