Radiated emission analysis of a heat sink with electrically-long noise sources

Author

Matsuura, Toshihiko

Author_Institution

Computational Sci. & Eng. Center, Fujitsu Ltd., Chiba, Japan

Volume

1

fYear

2001

fDate

2001

Firstpage

661

Abstract

The effect of using electrically-long noise sources (ELSs) on the emission of a mobile-PC heat sink structure has been studied. Physical noise sources for the CPU clock-net and the system bus-net have been constructed within the framework of the method of moments (MoM). Metallic structure has been excited by the ELS and its frequency response has been compared with that by the point noise source (PTS). The emission strength by the ELS shows very slow decay in the 2-5 GHz frequency-range, which contradicts the prediction by the PTS. By putting grounding posts around the heat plate, emission suppression effect by the Faraday cage has been numerically experimented upon for a simple geometry of a mobile-PC

Keywords

earthing; electromagnetic interference; heat sinks; method of moments; portable computers; 2 to 5 GHz; CPU clock-net; Faraday cage; MoM; electrically-long noise sources; emission; emission strength; emission suppression effect; grounding posts; heat sink; metallic structure excitation; method of moments; mobile-PC; physical noise sources; point noise source; radiated emission analysis; system bus-net; Clocks; Frequency; Geometry; Grounding; Heat sinks; Message-oriented middleware; Moment methods; Resistance heating; Solid modeling; System buses;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 2001. EMC. 2001 IEEE International Symposium on

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-6569-0

Type

conf

DOI

10.1109/ISEMC.2001.950725

Filename

950725