RADIO TELEPHONY EQUIPMENT AND ITS ANTENNA SYSTEM

摘要

PURPOSE: To obtain stable transmitting/receiving performance prevented from being influenced by the position of a device. CONSTITUTION: A list radio telephone system 2 has a case 4 including a transceiver and a strap 10 fitted to the case 4 to fit the system 2 to a user's wrist. The strap 10 includes an upper layer 12 and a bottom layer 14. The upper layer 12 is fitted to the bottom layer by a rotary mechanism 18. The mechanism 18 allows at least a part of the upper layer 12 to rotate around the bottom layer 14. A microphone 22 is arranged on the strap 10 and electrically connected to the transceiver. A speaker is arranged on the end part of the upper layer 12 on the strap 10 and electrically connected to the transceiver. First antennas 70, 71 are arranged on the bottom layer 14 of the strap 10. A second antenna 72 is arranged on the rotatable part of the upper layer 12 on the strap 10.