Title :
Shielded (STP) versus unshielded (UTP) twisted pairs: an EMC comparison
Author :
Mardiguian, Michel ; Raimbourg, Joel
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;
Conference_Titel :
Electromagnetic Compatibility, 2001. EMC. 2001 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-6569-0
DOI :
10.1109/ISEMC.2001.950524
