Research results on the radiation of MHz to GHz frequency band from 1) a printed circuit board (PCB) and 2) slowly breaking contact (SBC) are discussed as examples of Electromagnetic Compatibility (EMC) and reliability problem for electronic systems.
In first part, numerical and experimental results of the common and differential mode radiations from a sample PCB are described. The calculation has been done by the finite difference time domain (FDTD) method using super computer. The typical size of a sample PCB under test is 150mm length, 100mm width and 1.53mm thickness made by FR4 material. A model of signal line is microstrip line with 2.8mm width which is matched for 50 ohm characteristic impedance. The results show connection of the PCB and line is important source of the undesired electromagnetic noise.
In second part, experimental results of electromagnetic noise from the breaking switch measured by the current probe and in anechoic chamber are described. The opening speed of the contact is about 100 micron meter per second, the current is 4.5 A, 36 V and the material of the electrodes are mainly silver. It is newly revealed that slowly opening contacts generate very high electromagnetic current and radiation noise more than 1 GHz.
|Title of host publication||ICREPEC 2007 - Proceedings of the 2nd International Conference on Reliability of Electrical Products and Electrical Contacts|
|Publisher||China Science and Technology Press|
|Number of pages||6|
|Publication status||Published - 2007 Jan 1|
|Event||2nd International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2007 - Xiamen|
Duration: 2007 Mar 28 → 2007 Mar 31
|Other||2nd International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2007|
|Period||07/3/28 → 07/3/31|
- Giga hertz frequency
- Printed circuit board
- Undesired electromagnetic radiation
ASJC Scopus subject areas
- Safety, Risk, Reliability and Quality
- Electrical and Electronic Engineering