Analysis and Treatment of U-Shape PCB I/O Ports to Reduce the EMI From Image-Plane Noise

Author

Chou, Hsi-Hsir ; Wilkinson, Timothy D. ; Lee, Yung-Sen ; Chen, Hsing-Yi ; Peng, Song-Tsuen

Author_Institution

Dept. of Eng., Cambridge Univ., Cambridge, UK

Volume

1

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

446

Lastpage

452

Abstract

This paper examines the electromagnetic interference (EMI) due to the existence of U-shape I/O ports used for connection with RJ-45 connectors. These ports result in noise when image planes are used. The investigation also provides a useful approach to potentially reduce this noise source. U-shape I/O ports are a popular printed circuit board (PCB) structure and exist on PCBs used for information technology equipment, where image planes are generally referred to conducting layers in the vicinity of the electric circuits and signal sources such as a power plane, ground plane, and chassis plane. Both numerical simulations and measurements are employed in the examination, and they exhibit useful characteristics to detect and reduce the influence of EMI on PCBs.

Keywords

electric connectors; electromagnetic interference; interference suppression; numerical analysis; printed circuits; EMI reduction; RJ-45 connectors; U-shape PCB I/O port treatment; chassis plane; conducting layers; electric circuits; electromagnetic interference; ground plane; image-plane noise; information technology equipment; numerical simulations; power plane; printed circuit board structure; signal sources; Clocks; Connectors; Electromagnetic interference; FCC; Image edge detection; Noise; Electromagnetic interference; I/O ports; fringe effects and grounding rules; image planes; near-field analysis;

fLanguage

English

Journal_Title

Components, Packaging and Manufacturing Technology, IEEE Transactions on

Publisher

ieee

ISSN

2156-3950

Type

jour

DOI

10.1109/TCPMT.2010.2101252

Filename

5733388