Inductance of a coil in a slotted shield

John C. Young, Chalmers M. Butler

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The inductance of a coil in a slotted, conducting shell is investigated. At frequencies for which the coil is very small relative to wavelength, an integral equation is formulated and numerically solved for the electric field induced in the slots. From knowledge of the slot electric field, the inductance of the coil in the slotted shell can be calculated. The dependence of inductance on the presence of the slotted shell is assessed quantitatively and explained on the basis of physical principles. The inductance of a one-turn loop inside a slotted shell is measured, and the data are found to be in excellent agreement with computations. As an unslotted shield closes on a coil, inductance is reduced noticeably, but if the shield possesses axial slots, the reduction is much less significant.

Original languageEnglish
Pages (from-to)475-484
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number4
StatePublished - Apr 2002

Bibliographical note

Funding Information:
Manuscript received February 29, 2000; revised June 19, 2001. This work was supported by the U.S. Army Research Office under Grants DAAH04-95-1-0247 and DAAG55-98-1-0009 and under a National Science Foundation Graduate Fellowship. The authors are with the Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634-0915 USA. Publisher Item Identifier S 0018-926X(02)04961-X.


  • Apertures
  • Coils
  • Equations
  • Inductance
  • Integral

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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