Recent Antenna System Technologies for Next-generation Wireless Communications
نویسنده
چکیده
This paper describes the requirements of the antennas or antenna systems in recent high-speed and high-capacity wireless communication systems and the key technologies for satisfying them. It also explains the antennas and antenna systems being researched and developed for next-generation wireless communication systems. The antenna in such a system requires high gain, high-efficiency antenna elements and a multi-antenna design. This paper introduces a high-efficiency antenna created by integrating it with a monolithic microwave integrated circuit (MMIC) in a millimeter-wave frequency-band system, a multi-antenna system for the multiple-input multiple-output (MIMO) technique that enables multiple data transmission for land mobile communication systems, and a beam-scanning antenna for satellite communication systems. It also explains the general research and development trend of antenna systems and technical problems in each wireless system as an introduction to the other selected papers in this issue. Recent Antenna System Technologies for Next-generation Wireless Communications Antenna element Propagation Circuit Signal processing unit Total wireless system Antenna system Ant. Ant. Air BB IF/RF BB IF/RF Fig. 1. Wireless and antenna system. Selected Papers: Advanced Antenna System Technology † NTT Network Innovation Laboratories Yokosuka-shi, 239-0847 Japan E-mail: [email protected]
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