Technical Problems of the Shunt-Type Asymmetric Artificial Network

• Published in: IEEE transactions on electromagnetic compatibility Vol. 58; no. 5; pp. 1526 - 1534
• Main Authors: Hirasawa, Norihito, Takaya, Kazuhiro, Akiyama, Yoshiharu, Amemiya, Fujio, Sugiura, Akira, Wada, Osami
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymmetric artificial network (AAN); Asymmetry; Cable television; common-mode disturbance; Conversion; Current measurement; differential-mode disturbance; Disturbances; Electric potential; Electromagnetic compatibility; electromagnetic interference measurement; EMC; Impedance; Impedance measurement; Inductors; Networks; Power cables; Receivers; Voltage; Voltage measurement
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2016.2566666

Theoretical and experimental investigations were carried out on the characteristics of the shunt-type asymmetric artificial network (AAN). The findings are as follows: 1) The theoretical formulas for the differential- and common-mode impedances as well as the longitudinal conversion loss (LCL) were derived for the shunt-type AAN in terms of the AAN circuit parameters. 2) The common-mode disturbance voltage estimated from the measured voltage is not proportional to the actual common-mode current flowing in the network cable of the equipment under test (EUT). 3) For the common-mode EUT, the shunt-type AAN with a low LCL of less than about 42 dB yields incorrect measurement results with an error greater than 0.5 dB. 4). A more crucial problem is that, for the differential-mode EUT, the measured disturbance voltage decreases as the EUT common-mode impedance decreases.