An Online Method for Load Impedance Extraction for Printed Lines based on Near Field Measurements

Abstract

In this paper, an online load impedance extraction method for printed lines on the printed circuit boards (PCBs) is proposed. Firstly, the relationship between the conducted current and the magnetic probe voltage is built through the near magnetic field. Secondly, the distributed characteristic of the probe voltage obtained is analyzed by considering the transmission line effect on the microstrip line. Then, the extracted method is proposed and the load impedance can be extracted with the voltage or magnetic field results at two different locations along the printed line. Simulation and measurement experiments are carried out to validate the proposed method. Results shows that the impedances obtained from the proposed method agree well with the setting value.