Development of Millimeter-Wave High-Speed Wireless LAN Systems Based on Multiple Access Technology in 60GHz Band

随着多媒体通信时代的开启，光纤网络中正在建设比特率超过几百Mb/S的高速通信系统。毫米波在构建如此高比特率的无线通信系统方面也引起了人们的极大关注。考虑到这一事实，我们开发了具有点对多点多址方案的无线局域网系统。由于毫米波前端在毫米波系统中起着关键作用，利用我们的NRD导波技术制作了由稳频振荡器、环行器、定向耦合器、匹配负载和上/下变频器组成的发射机和接收机，有望提供高性能的毫米波集成电路。还提出了一种外形简单、性能多功能的新型毫米波天线。该天线具有从宽波束到窄波束方向图变化简单的显著优点。基于NRD导引技术，在60 GHz频段成功实现了400MB/S以上的超高速无线通信系统和2 GHz以上的多媒体信源分配系统。

With the opening of the multi-media communication era, high-speed communication systems with a bit rate of more than several hundreds Mb/s are being built in optical fiber networks. Millimeter-waves have also attracted much attention for the constructions of wireless communication systems having such high bit rate.Having this fact in mind, we have developed wireless local area network systems with a multiple access scheme for a point to multi points. Since millimeter-wave front ends play key role in such systems, the transmitter and receiver, consisting of frequency stabilized oscillator, circulator, directional coupler, matched load, and up/down converters, have been fabricated by using our NRD guide technology that promises to provide a high-performance millimeter-wave integrated circuits.New type of millimeter-wave antenna which are simple in shape but multifunctional in performance have been also proposed. The antenna has notable advantage of changeable radiation pattern from wide beam to narrow beam by using simple manner. Thus, the wide beam and narrow beam antennas can be built in the transmitter and receiver for base station use and information terminal use, respectively.The ultrahigh-speed wireless communication systems with an asynchronous transfer mode (ATM) based bit rate of more that 400Mb/s and multimedia information source distribution systems with a bandwidth of more than 2GHz have been successfully performed based on the NRD guide technology in 60GHz band.