Development of Design System for Metallic Guiding Devices Coping with High-Speed Transmission of Digital Signals

随着半导体技术的发展，目前用于通信设备的数字信号已达到5-10Gbps级。这种高速传输的测试系统已经尝试建立起来。其中，即使在不久的将来比特率增长数倍的情况下，金属导引装置也被认为将发挥重要作用。这是因为金属可以经济而准确地加工，而且它们不需要在集成电路中使用光电转换器。基于这种情况，本研究旨在开发单元技术，以克服与这类传输有关的困难，开发结合电磁和电路理论的精确仿真方法，并将上述方法应用于各种具体的导轨。处理过的仿真技术包括积分方程法、模式匹配法和等效源方法等。它们被用来解决以下问题。(1)分析、设计、制造和评估高质量的导引装置和天线：平行板金属透镜、同轴电缆、隔离器、圆极化发生器、金属栅格和介质栅格。(2)金字塔形吸波材料的性能研究，它是消除数字信号中有害噪声的有用材料。(3)金属表面粗糙度引起的导体损耗计算是高频传输的难点之一。(4)将发展的数值方法融入探测埋藏目标的信号处理算法中。两年来，构建设计体系的基本程序已基本确立。这一过程统一了从设计到包装的过程，使我们能够减少时间和经济成本。该系统在未来很容易扩展和完善。

According to the development of semiconductor technology, digital signals used for communication equipments nowadays reach the 5-10 Gbps class. Testing systems for this kind of high-speed transmission have been tried to construct. Among them, metallic guiding devices are believed to play important roles even when the bit rate grows several times in the near future. This is because metals can be processed economically and with accuracy, and further, they do not need optical-electrical transformers in the integrated circuits. Based on this situation, the present research aims at the development of element techniques for overcoming difficulties related to this class of transmission, the development of accurate simulation methods that combine the electromagnetic and circuit theories, and the application of the above to various concrete guides. Treated simulation techniques include the integral equation method, the mode matching method, and the equivalent source method, and so on. These are used to attack the following problems. (1)The analysis, design, fabrication, and evaluation of guiding devices and antennas of high quality : parallel plate metallic lenses, coaxial cables, isolators, generators of circular polarization, metallic gratings, and dielectric gratings. (2)The investigation of properties of electromagnetic wave absorbers of pyramidal shape, which is a useful material for elimination undesired noises of digital signals. (3)The computation of conductor losses due to the roughness of metallic surfaces, which is one of the difficulties in high frequency transmission. (4)The incorporation of the developed numerical method to the signal processing algorithm for exploring buried targets. For these two years, the fundamental routine to construct the designing system has been almost established. This process unifies the process from design to packaging, and enables us to reduce the time and economical cost. It is easy to extend and improve the system in the future.