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Author: Hirokazu Tohya
I joined NEC in 1968 and was assigned to the circuit development department of the computer division. My first work was the circuit design of the switching mode power supply (SMPS) for the mainframe of the computer system. My job area was expanded to development of the design rule and to standardization of all over the electric and electronics parts for the non-logic circuit. Non-logic circuit was categorized to except the gate-array which forms the logic circuit of the mainframe. The experiment of SMPS was considered to be dangerousness and no one wanted to design. Therefore, my development of the power supply system (PSS) including the circuit design of SMPS was continued. The electric current of the mainframe and the supercomputer was reached to several thousand amperes. The critical problem of PSS was the heat dissipation and the electromagnetic interference (EMI) against the logic circuit. In 1992, the full-scale R&D of EMC became necessary hastily. I was nominated and transferred to the chief managing researcher of the established EMC engineering center in NEC Laboratories. I had believed that the switching mode circuit (SMC) including the digital circuit and SMPS circuit will be improved greatly if the EMC problem is solved. However the deep R&D was difficult because the actual fruits in every year were required strongly. Therefore, his knowledge of the science concerning EMC was not deepened enough. However I could understand the actual status of technologies of the electronics and electrics widely and the basic knowledge about how to approach the science as well as R&D could be learned. During this time, I completed PhD course and received the PhD. degree from Kyushu University, lectured in Kyushu University and Tohoku University for one year each, and executed several national projects by the cooperation of his colleague in NEC and of the supporters in the industrial society and academia. These are considered to be my best harvest in NEC Laboratories. I had decided to continue R&D for solving EMC problem of SMC after his retirement and to try the commercialization of the fruit of R&D. I established ICAST which is the abbreviation of the innovative circuit and system technologies in 2005. The solitary electromagnetic (SEMW) theory was advocated and the novel technologies including the low impedance lossy line (LILL) and the matched impedance lossy line (MILL) were invented based on the SEMW theory.
Two purposes exist in this eBook. The first is to be validated the SEMW theory by the academia and the industrial society. The second is the contribution to the growth of the industry in the world by the technologies of LILL and MILL.