## Abstract

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 x 60 x 0.51 mm3, length of the line is 185 x 5mm2 and 1 kQ 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 mbdel. Emission at frequency less than 200 MHz, which is near the wavelength of A/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.

Original language | English |
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Pages (from-to) | 561-567 |

Number of pages | 7 |

Journal | IEICE Transactions on Communications |

Volume | E83-B |

Issue number | 3 |

Publication status | Published - 2000 Jan 1 |

## Keywords

- Current spectrum
- FDTD method
- Impedance of printed line
- Near field noise

## ASJC Scopus subject areas

- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering