| 摘要 |
PROBLEM TO BE SOLVED: To provide an earphone antenna which reduces costs and improves antenna characteristics. SOLUTION: The earphone antenna has an earphone 3 which has earphones 14R and 14L provided on one-end sides of earphone cords 13R and 13L and a pin jack 15 on the other end side; a coaxial cable 4 which has a core wire and a shielded wire 22 formed of mutually insulated conductors 24R and 24L, and which is provided on one end side with a pin connector 25 where the pin jack 15 is inserted and extracted and which connects the conductors 24R and 24L to the earphone cords 13R and 13L; and a pin plug connector 5 which is provided on the other end side of the coaxial cable 4 and connected to mobile radio electronic equipment. The one end side of the coaxial cable 4 is connected to a separating/superposing circuit 27 which is provided to the pin plug connector 5, separates a high-frequency signal and a low-frequency signal, and superposes the low-frequency signal. COPYRIGHT: (C)2007,JPO&INPIT
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