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。针对这种高速传输的测试系统已经尝试构建。其中，在不久的将来，即使比特率增长数倍，金属导向装置也将发挥重要作用。这是因为金属加工既经济又精确，而且在集成电路中不需要光电变压器。基于这种情况，本研究的目标是开发克服此类传输相关困难的元件技术，开发结合电磁理论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导轨。处理过的仿真技术有积分方程法、模态匹配法、等效源法等。这些是用来解决以下问题的。(1)高质量导向装置和天线的分析、设计、制造和评估：平行平板金属透镜、同轴电缆、隔离器、圆偏振发生器、金属光栅和介电光栅。(2)金字塔形电磁波吸波器的特性研究，它是消除数字信号中不良噪声的有用材料。(3)计算由于金属表面粗糙度引起的导体损耗，这是高频传输的难点之一。(4)将所开发的数值方法与探测埋地目标的信号处理算法相结合。这两年来，构建设计系统的基本流程已经基本建立。该工艺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。该系统便于以后的扩展和改进。

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.