Implementing ferrites in finite-difference time-domain (FDTD) modeling requires special care because of the complex nature of the ferrite impedance. Considerable computational resources and time are required to directly implement a ferrite in the FDTD method. Fitting the ferrite impedance to an exponential series with the generalized-pencil-of-function (GPOF) method and using recursive convolution is an approach that minimizes the additional computational burden. An FDTD algorithm for a lumped ferrite using GPOF and recursive convolution is presented herein. Two different ferrite impedances in a test enclosure were studied experimentally to demonstrate the FDTD modeling approach. The agreement is generally good.


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

EMC; FDTD Algorithm; FDTD Modeling; Convolution; Electric Impedance; Electromagnetic Compatibility; Electromagnetic Shielding; Exponential Series; Ferrite Impedance; Ferrites; Finite Difference Time-Domain Analysis; Finite-Difference Time-Domain; Generalized-Pencil-Of-Function (GPOF) Method; Lumped Ferrites; Recursive Convolution; Shielding Enclosure; Test Enclosure; Algorithms; Computational Methods; Electric Impedance; Finite Difference Method; Mathematical Models; Time Domain Analysis

International Standard Serial Number (ISSN)

0018-9375; 1558-187X

Document Type

Article - Journal

Document Version

Final Version

File Type





© 2000 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.