EMI Investigation and Mitigation of Flexible Flat Cables and Connectors

Abstract

In modern mobile devices, as a result of the increase in data rate, requirement for higher density signal and cost-effective solution, the flexible flat cable (FFC) now plays an important role to connect separated printed circuit boards (PCBs). Due to the low-cost fabrication and varied shielding structure, FFC has been identified as a noise source for electromagnetic interference (EMI) and desense issues. In this paper, the common mode noise generated from FFC and related connectors is investigated. With the assistance of full wave and circuit simulation, main cause of the common mode noise has been identified as the ground discontinuity and the related voltage difference between the PCB ground and the FFC ground. By providing better shielding and improving ground continuity, 11 dB reduction of total radiation power (TRP) is observed at 5 GHz.

Meeting Name

2021 IEEE International Joint Electromagnetic Compatibility Signal and Power Integrity and EMC Europe Symposium, EMC/SI/PI/EMC Europe 2021 (2021: Jul. 26-Aug. 13, Raleigh, NC)

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Comments

This work was supported in part by the National Science Foundation (NSF) under Grant IIP-1916535.

Keywords and Phrases

Flexible Flat Cable; Ground Discontinuity; Noise

International Standard Book Number (ISBN)

978-166544888-8

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

13 Aug 2021

Link to Full Text

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