The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 1997
Filed:
Nov. 01, 1995
Takamasa Ebihara, Tokyo, JP;
Meisei Electric Co., Ltd., Tokyo, JP;
Abstract
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.