Contribution to development and standardization of EMC technologies for telecommunication systems





In the background of the great changes from Public Switched Telephone Network (PSTN) to Broadband Network using Internet Protocol, the advancement of communication rate along with the popularization of broadband services and the diversification of services along with a mixture of fixed line and wireless such as ubiquitous services, various emerging issues about Electromagnetic Compatibility (EMC) for telecommunication system have risen up to the surface.
Telecommunication equipment with many communication lines and a power line has several unique modes of malfunction relative to normal electronic device, such as the radiation disturbance ( emission problems), the false operation by foreign disturbance (immunity problems) and the breakdown by overvoltage like lightning surge.
The results of this research have much contributed to the both fields of academia and industry, in which the future of EMC technologies for telecommunication systems has been discussed theoretically and practically, the generating mechanisms of these EMC problems have been solved and the optimum testing, assessment techniques and the countermeasure methods have been consolidated by developing filters for telecommunication line, electromagnetic shielding materials and disturbance measuring apparatuses to practical use.
Especially, the testing method and testing apparatus of disturbances radiated from telecommunication lines have been newly invented, and those achievements have been standardized into IEC/CISPR publications. As a result, the standards of disturbance for ITE (Information Technology Equipment) with telecommunication lines have become to use widely all over the world. These research works have contributed much to the progress and popularization of EMC technologies for telecommunication systems.


・Amemiya, Kuwahara, "Design Method of Impedance Stabilization Networks for Measuring Disturbances at Balanced Multiple-Pair Telecommunication Ports" IEICE Trans.Communications.,Vol.E83-B, No.4, Apr. 2000

・Amemiya, Hiroshima, Kuwahara, "Measurement of Disturbances at Telecommunication Ports by Using Both Voltage and Current Probes "IEICE Trans.Communications., Vol.E84-B, No.2, Feb 2001

・Kobayashi, Hiroshima, Itou, Hurutani, Hattori, Tada, "A Novel Non-contact Capacitive Probe for Common-mode Voltage Measurement "IEICE Trans.Communications., Vol.E90-B, No.6, Jun, 2007

・Tajim, Kobayashi, Kuwahara, Tokuda, "Development of Optical Isotropic E-field Sensor Operating More than 10GHz Using Mach- Zehnder Interferometers" IEICE Trans.Electron., Vol.E85-C, NO.4, April 2002

・Yamane,Tominaga,Katou,Murakawa,Tajima, "Measurement Results of Lightning Surge Current on AC Mains Line Connected to Access Network Equipment" International Conference on Lightning Protection, ICLP2006 Kanazawa,2006

・Miyoshi, Kuwahara, Akiyama, Tajima, "Analysis Method of Radiated Magnetic Field from Indoor AC Mains Line Using 4-Port Network" IEICE Trans.Communications.,Vol.90-B,No.6, 2007

・Kobayashi, Hattori, Tajima, Hiroshima, Kuwahara, "Capacitive voltage probe for non-contact measurement of common-mode voltage" 13th International Zurich Symp. on EMC,1999

・T. Aoki, K. Tajima, T. Tominaga, and R. Kobayashi, “Electromagnetic Compatibility Standards and Their Application in NTT Group,” NTT Technical Review, Vol. 5 No. 12, 2007

Related Researches


(Engineering Sciences for Electronics, Information and Communication Engineers)

Events in World

no data.
Page Top