Shielded (STP) versus unshielded (UTP) twisted pairs: an EMC comparison

Author

Mardiguian, Michel ; Raimbourg, Joel

Volume

1

fYear

2001

fDate

2001

Firstpage

43

Abstract

The respective pros and cons of shielded (STP) and unshielded (UTP) twisted pairs are reviewed. Besides their lower cost, the hidden advantages of UTP are a slightly better balancing and a simpler connector hardware. Their balancing and common mode (CM) rejection can even be improved by high quality differential transformers with integrated CM blocking chokes. However when it comes to immunity to severe RF fields and to kilovolt electrical fast transients (EFT), UTP cannot achieve the necessary decoupling for mast typical high speed bus applications. This paper calculates the various emission and immunity features of modern UTP and STP, for a quantitative comparison

Keywords

cable shielding; electromagnetic compatibility; electromagnetic interference; electromagnetic shielding; twisted pair cables; common mode rejection; connector hardware; high quality differential transformers; high speed bus applications; integrated common mode blocking chokes; kilovolt electrical fast transients immunity; radiated emissions; severe RF fields immunity; shielded twisted pairs; unshielded twisted pairs; Attenuation; Bandwidth; Connectors; Costs; Electromagnetic compatibility; Hardware; IEC standards; Inductors; Radio frequency; Transformers;

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.2001.950524

Filename

950524