Parasitic inductance in printed circuit board geometries can worsen the EMI performance and signal integrity of high-speed digital designs. Partial-inductance theory is a powerful tool for analyzing inductance issues in signal integrity. However, partial inductances may not adequately model magnetic flux coupling to EMI antennas because the EMI antennas are typically open loops. Therefore, partial inductances may not always accurately predict radiated EMI from noise sources, unless used in a full-wave analysis such as PEEC. Partial inductances can be used, however, to estimate branch inductances, which can be used to predict EMI. This paper presents a method for decomposing loop or self inductances into branch inductances. Experimental as well as analytical investigations are used to compare branch- and partial-inductances.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility (1998: Aug. 24-28, Denver, CO)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

EMI Antennas; Branch Inductances; Electromagnetic Interference; Equivalent Circuits; Inductance; Magnetic Field Coupling; Magnetic Fields; Magnetic Flux; Magnetic Flux Coupling; Parasitic Inductance; Partial Inductance Theory; Printed Circuit Board Geometries; Printed Circuits; Radiated EMI Performance; Signal Integrity; Coupling Circuits; Inductance; Magnetic Analysis; Printed Circuits; Geometry; Signal Design; Signal Analysis; Magnetic Noise

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 1998 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 1998