Inductance of a shielded coil

John C. Young, Chalmers M. Butler

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Models are developed for the inductance of a helical coil and a helical coil inside a conducting shield. Values of inductance are found from analysis. The dependence of inductance on the presence of the shield is assessed quantitatively and explained on the basis of physical principles, and the significance of skin and proximity effects in the wire coil is outlined. The inductance of an isolated, one-turn loop and a one-turn loop inside a conducting tube are measured and are found to be in excellent agreement with computed data. When the conducting shield and coil are very close, the inductance of the coil is found to be greatly diminished suggesting that one must account for the presence of shields when characterizing inductors, which might be used for loading and tuning of antennas. A nearby conducting shield must be accounted for in inductance calculations if reasonable accuracy is expected.

Original languageEnglish
Pages (from-to)944-953
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number6
StatePublished - Jun 2001

Bibliographical note

Funding Information:
Manuscript received December 7, 1999; revised October 12, 2000. This work was supported by the Army Research Office under Grants DAAH04-95-1-0247 and DAAG55-98-1-0009. This work was also supported under a National Science Foundation Graduate Fellowship. The authors are with the Department of Electrical and Computer Engineering, P.O. Box 340915, Clemson University, Clemson, SC 29634-0915. Publisher Item Identifier S 0018-926X(01)05244-9.

Copyright 2012 Elsevier B.V., All rights reserved.


  • Antenna loads
  • Inductance
  • Shielded coils

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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