Abstract
In this paper, we propose a vertical stepped impedance electromagnetic bandgap (VSI-EBG) structure with a stopband enhancement and a size reduction for a wideband suppression of simultaneous switching noise (SSN) coupling in multilayer printed circuit boards (PCBs). The proposed VSI-EBG structure forms the stepped impedance EBG structure of power planes, which is implemented with a vertical branch, high-impedance (hi- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Z</i> ) and low-impedance (low- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Z</i> ) metal patches on different layers. Test vehicles are fabricated using a multilayer PCB process to verify the proposed VSI-EBG structure. Through experimental measurements, we verified the enhanced suppression of SSN coupling (below -40 dB) between 650 MHz and 20 GHz. In addition, we demonstrated that <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">fL</i> is reduced from 2.4 GHz to 650 MHz compared to the previous EBG structure, which allows an approximately 86% size reduction.
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