Suppression of Parallel Plate Modes Using Edge-Located EBG Structure in High-Speed Power Bus

• Published in: Journal of Information and Communication Convergence Engineering, 14(4) Vol. 14; no. 4; pp. 252 - 257
• Main Authors: Cho, Jonghyun, Kim, Myunghoi
• Format: Journal Article
• Language: English
• Published: 한국정보통신학회JICCE 31.12.2016; 한국정보통신학회
• Subjects: 전자/정보통신공학; Electromagnetic bandgap (EBG); Radiated emission; Parallel plate waveguide (PPW)
• ISSN: 2234-8255; 2234-8883
• DOI: 10.6109/jicce.2016.14.4.252

An edge-located electromagnetic bandgap (EL-EBG) structure using a defected ground structure (DGS) is proposed to suppress resonant modes induced by edge excitation in a two-dimensional planar parallel plate waveguide (PPW). The proposed EL-DGS-EBG PPW significantly mitigates multiple transverse-magnetic (TM) modes in a wideband frequency range corresponding to an EBG stopband. To verify the wideband suppression, test vehicles of a conventional PPW, a PPW with a mushroom-type EBG structure, and an EL-DGS-EBG PPW are fabricated using a commercial process involving printed circuit boards (PCBs). Measurements of the input impedances show that multiple resonant modes of the previous PPWs are significantly excited through an input port located at a PPW edge. In contrast, resonant modes in the EL-DGS-EBG PPW are substantially suppressed over the frequency range of 0.5 GHz to 2 GHz. In addition, we have experimentally demonstrated that the EL-DGS-EBG PPW reduces the radiated emission from −24 dB to −44 dB as compared to the conventional PPW. KCI Citation Count: 0