This paper describes the evaluation of the susceptibility of a cavity with an aperture using the finite-difference time-domain (FDTD) method and experimentally. To reduce the computing time, the FDTD method is used for the radiation from the cavity and the susceptibility is obtained by using the reciprocity theorem. The cavity used here is modeled after a full-tower desktop enclosure with a 3.5-in bay. The susceptibility characteristics are evaluated by measuring outputs of a monopole antenna and transmission lines installed in the cavity. The susceptibility characteristics, using a three-dimensional (3-D) map, are studied from the computed and the measured results by applying slowly rotating electromagnetic fields to the cavity on a turntable. Measured and modeled results are in good agreement, indicating the merits of the proposed approach for susceptibility/immunity evaluation. Moreover, some discussions are made to check the susceptibility mechanism.


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory


Japan Society for the Promotion of Science


This work was supported in part by the Japan Society for the Promotion of Science (JSPS), under the Research for the Future Program-Reduction of Electromagnetic Noise Levels.

Keywords and Phrases

Electromagnetic Coupling; Finite-Difference Time-Domain (FDTD); Three-Dimensional (3-D) Susceptibility Map; Finite-Difference Time-Domain (FDTD) Method; Reciprocity Theorem; Rotating Fields; Antennas; Electric Lines; Finite Difference Method; Theorem Proving; Time Domain Analysis; Electromagnetic Coupling; Monopole Antenna; Electromagnetic Fields; Finite Differences; Reciprocity Theorems

International Standard Serial Number (ISSN)

0018-9375; 1558-187X

Document Type

Article - Journal

Document Version

Final Version

File Type





© 2004 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2004