Development of devices and systems toward realization of high-capacity wireless communications by terahertz waves

为了在尚未开发的太赫兹频段实现大容量的无线通信，我们研究了太赫兹波的振荡和调制以及无线数据传输。对于振荡器件，我们实现了室温振荡在1.55太赫兹使用共振隧穿二极管与减少电子延迟，这是半导体电子器件的最高频率。通过对集成微天线的结构优化，实现了这些振荡器的大功率振荡和高速直接调制。还获得了用于具有光信号的太赫兹波的调制器和用于调制的具有高电流驱动能力的晶体管。利用谐振隧穿二极管发射器和肖特基势垒二极管接收器实现了无线数据传输，获得了大容量通信的可行性。

Toward realization of high-capacity wireless communications in the undeveloped terahertz frequency region, we investigated oscillation and modulation of terahertz waves, and wireless data transmission. For the oscillation device, we achieved room-temperature oscillation at 1.55 THz using resonant tunneling diodes with reduced electron delay, which is the highest frequency of semiconductor electron devices. High-power oscillation and high-speed direct modulation of these oscillators were achieved with the structure optimization of the integrated micro-antennas. Modulators for terahertz waves with optical signal and transistors with high current drivability for modulation were also obtained. Wireless data transmission was demonstrated with the resonant- tunneling-diode transmitter and Schottky-barrier-diode receiver, and feasibility of high-capacity communication was obtained.