To provide a radio communication terminal device which can suppress the entry of noise of a high-frequency component, which is generated at a control circuit part of an information processor and a communication control circuit part of a body device and falls down to the reception frequency of the body device, into a high-frequency circuit part of the body device.
A 1/2λ whip antenna 102 when extended operates as an antenna to its overall length and a high-frequency current hardly flows to the ground of a 1st circuit board 106. When the antenna is stored, a 1/4 helical antenna 101 and a metal vapor-deposited 1/4λ radial of a 1st housing 103 operate as an antenna to the overall length and a high-frequency current hardly flows to the ground of the 1st circuit board 106. The overall length of the antenna is 1/2λ when the antenna is extended and stored, so a high-frequency current hardly flows to the ground of the 1st circuit board 106, so the input of noise generated by the circuit control part of information processor such as a personal computer and a PDA and noise generated by the communication control circuit part of a radio communication terminal device to a high-frequency circuit through the ground of the circuit board 106 can be reduced.
YAKIDA HIDEKI
KAMIYA TADANAKA
