FDTD Simulation and Experimental Study on Line Impedance and Magnetic Near Field Noise for a Simple Printed Line Model

Takashi KASUGA, Motoshi TANAKA, Hiroshi INOUE

Summary :

This study is to clear how the impedance and the current of a simple printed line model involve to the near field electromagnetic noise radiation, by computer simulation and experiment. Frequency characteristics of the impedance and the current of the printed line and the near field noise are considered, from low to high frequency components. The model size 225 60 0.51 mm³, length of the line is 185 5 mm² and 1 kΩ termination resistance is connected as non-matching load. FDTD method is used to calculate the impedance, the current waveform and the near field noise. Measurements of the line impedance and the near field noise spectrum by clock pulse are compared with simulations. It is cleared that using FDTD method, the characteristic of impedance of the printed line model, the current waveform, and the near field noise can be calculated at the same simulator. As results, from calculation and measurement, the near field noise has a relationship with impedance of printed line model. Emission at frequency less than 200 MHz, which is near the wavelength of λ/4, is observed at significant intensity. So, it is suggested that near field noise emission should be discussed from low to high frequency and analysis of the characteristics of the printed line and magnetic near field noise using FDTD method and measurement is useful to basic examination of complex PCB models.

• Publication: IEICE TRANSACTIONS on Communications Vol.E83-B No.3 pp.561-568
• Publication Date: 2000/03/25
• Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Electromagnetic Compatibility Technology)
• Category: EMC Design of PCB

Authors

Takashi KASUGA
Motoshi TANAKA
Hiroshi INOUE

Keyword

impedance of printed line,  current spectrum,  near field noise,  FDTD method