Abstract

In this paper, impedance mismatch effects on the characteristics of common-mode (CM) electromagnetic bandgap (EBG) filters are studied using 3D full-wave numerical simulations. Herein, the terminations are fixed at 50 Ohms, and the effect of the differential line impedance variations are studied. Two types of CM EBG filters are considered in this work, both are designed using standard printed circuit board technology. The first group contains microstrip (MS) differential pairs running above the EBG plane, and the second group contains strip line (SL) differential pairs running on one of the layers next to the EBG plane. It is shown that the lines impedance mismatch in MS and SL has different effects on the EBG CM filter behavior. Overall, the considered variations in the widths of the traces and edge-to-edge separation distances in the MS and SL structures do not drastically deteriorate the performance of the EBG CM filters. Notch frequencies do not vary much, especially in the MS case, and the filter bandwidth at -15 dB just increases as mismatch increases, which is the favorable effect. Below -15 dB, the CM notch depth itself does not matter from the CM mitigation point of view as soon as the filter bandwidth at the required frequency is achieved.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

common mode; differential mode; electromagnetic bandgap (EBG); microstrip; notch filter; printed circuit board impedance mismatch; stripline

International Standard Book Number (ISBN)

978-153869199-1

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Jul 2019

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