Patent ID: 7349718

Claim:
A portable telephone set comprising: a first housing provided with a first terminal and a second terminal to be connected with a first external antenna and a second external antenna; and a second housing electrically connected via a coaxial cable and mechanically connected with the first housing, wherein the first housing comprises: a switch connected via a capacitor with the coaxial cable, for selectively connecting one of the first terminal and the second terminal which provides higher receipt sensitivity on the basis of a switching signal; and a DC power supply connected via an inductance to the coaxial cable, wherein the second housing comprises: a radio circuit connected via a capacitance with the coaxial cable, for processing a radio signal to be transmitted, supplying the processed radio signals to at least one of a first internal antenna and a second internal antenna and processing the received radio signal; a control circuit connected via an inductance with the coaxial cable, for outputting the switching signal on the basis of the received signal level by the external antenna and an inductance connected between the coaxial cable and a circuit required to be supplied with the DC power supply, wherein the radio signal is transmitted/received and the DC power is supplied via the coaxial cable.