| 摘要 |
A radio portable remote terminal device which has two antennas, and in which an antenna not in use contributes to the performance of the antenna presently in use. An external antenna has an external antenna element which is capable of being extended from an enclosure or being retracted and contained in the enclosure reciprocally. An internal antenna has a ground section, a detector for detecting whether the external antenna element is extended from the enclosure or is retracted in the enclosure. A switching circuit switches a connection between a radio section circuit and the external antenna or the internal antenna reciprocally. A printed circuit board mounts the external antenna with the external antenna element contained in the enclosure and the internal antenna measures on opposite sides thereof. When the external antenna element is retracted into the enclosure, a radio section circuit on the printed circuit board is disconnected from the external antenna and connected to the internal antenna. When the external antenna element is extended from the enclosure, the radio section circuit on the printed circuit board is disconnected from the internal antenna and connected to the external antenna.
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