| Co-Investigator(Kenkyū-buntansha) |
SATO Hiroya Advanced Research Lab., Sharp Co.General Manager, 基盤研究所, 主任研究員
NOHARA Minoru Dept.of Elec. Eng., Kure Nat'l.Coll. of Tech., Associate Professor, 機械工学科, 助教授 (30043821)
YONEYAMA Tsukasa Dept. of Comm. Eng., Tohoku Inst. of Tech., Professor, 通信工学科, 教授 (40006226)
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| Research Abstract |
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 a high resolution video signal distribution system for wall-hanging displays based on the millimeter-wave wireless technology. Since millimeter-wave front ends play key role in such systems, the transmitter and receiver have been fabricated by using our NRD guide technology that promises to provide a high-performance millimeter-wave integrated circuits. NRD guide transceiver, fabricated for wireless LAN at 60GHz, has great advantages such as high speed operation beyond 400Mbps as well as small size less than that of the name card. With this in mind, Giga-bit based transmitter and receiver have been developed for applications to the
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IEEE 1394 and SDI systems. The transmitter consists of Gunn diode oscillator with the output power of 12dBm, ASK modulator made by Schottky barrier diode, and circulator, while the receiver consists of local Gunn diode oscillator with the LO power of 10dBm and balanced mixer with the conversion loss of 12dB. Millimeter-wave with the frequency of 59.75GHz is modulated by the 1Gbps clock in the NRD guide ASK transmitter, and the demodulated wave which is received by the NRD guide receiver separated by a distance of about 5mm in a narrow hall is down-converted to the intermediate frequency (IF) of 2.25GHz. And then the IF wave is amplified and detected. The modulating and demodulated wave forms, observed by oscilloscope are identical in shape, thus, it is confirmed that the transmitted signal can be clearly recovered in the receiver. The transmitter and receiver can be applied to wireless portion in IEEE1394 systems and SDI-based HDTV signal distribution systems. 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. Less
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