| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna for portable telephone set, which can surely emit light when a system becomes an incoming state and informs a user of the incoming state, even if the antenna is fitted to the portable telephone set of a TDMA system or a CDMA system and is used. SOLUTION: The detection circuit of an incoming radio wave constitutes an antenna for portable telephone set with the detection circuit 14 of a first incoming radio wave, which is formed of a first coil 12 that is connected to an antenna main body 8 and generates a potential difference and of a first rectifying diode 13, that is connected to the first coil 12 in series and converts high frequency AC into DC, and with the detection circuit 18 of a second incoming radio wave, in which a light emitting diode 15, where both end parts are connected to the other end part of the first rectifying diode 13 of the detection circuit 14 of the first incoming radio wave, a second coil 16 for generating a potential difference different from or equal to the first coil 12 and a second rectifying diode for converting high frequency AC into DC equal to or different from the first rectifying diode 13 are connected in series. |
