Meisei Electric Co., Ltd.

Takamasa Ebihara

A radio telephone system and an antenna device and a base station for the same which permit the expansion of a radio communication range and also further extension of the distance between the base station and an antenna. A single base station accommodates a plurality of antenna devices and the base station and the antenna devices are connected by optical fiber cables. Each of the antenna devices is equipped primarily with an optical-to-electrical converter, an electrical-to-optical converter, a distributor, frequency converters/amplifiers, local frequency oscillators, a control channel signal detector, a transmit/receive switcher, a controller, and antenna. The transmit/receive switching control is synchronized with the transmitting and receiving timings for send and receive signals transferred to and from the base station by using a slot number transmitted through a transmission control channel. The plurality of antenna devices connected to the single base station make it possible to expand the radio communication range to an arbitrary range in practical use; they also permit free selection of an area of radio communication range by connecting the base station with the antenna devices by optical fiber cables. In addition, the transmit/receive switching control of the antenna devices is carried out in accordance with the receiving timing of a slot number of a transmission control channel from the base station. This ensures accurate transmit/receive switching control.

Growing community of inventors

Tokyo, Japan

Takamasa Ebihara