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Capacitors are commonly used as components of electromagnetic interference (EMI) filters. However, the parasitic inductances of capacitors often limit the high-frequency performance of filters and make it difficult to meet EMI requirements. This letter proposes an approach to reduce the parasitic inductances of a typical three-capacitor EM! filter by introducing two equivalent negative inductances from two terminals of three coupled inductors. Theoretical analysis and formula deduction for the design of the two equivalent negative inductances and the reduction of capacitor parasitic inductances are demonstrated. The proposed configuration can further improve the performance of the filter by increasing its order. Verification by numerical simulations and experimental measurements shows that the proposed method can effectively improve high-frequency filter performance. In the case we studied, the insertion losses of a three-capacitor EM! filter at 50 MHz could be reduced by 16.8 dB for the differential-mode and by 19.2 dB for the common-mode components when two negative inductances were applied. [ABSTRACT FROM AUTHOR]

Investigates the variability of electromagnetic interference data for various electronic products. Use of analysis of variance; Estimation of data variability; Development of confidence limits for radiated emission of electronic equipment.

A novel sacrificial electrode with fractal to protect surface acoustic wave devices from electrostatic discharge (ESD) break is proposed. Finite difference time domain method and source model are carefully developed to simulate the ESD transient response. Compared with a traditional electrode,the simulation results show that fractal can improve the protective efficiency greatly. [ABSTRACT FROM PUBLISHER]

Presents an obituary for Kung-Chie Yeh, professor emeritus of electrical and computer engineering at the University of Illinois in Urbana-Champaign. Educational background; Contributions to ionospheric research and engineering education; Production of reserch on problems related to wave propagation, the ionosphere, and upper-atmosphere dynamics.