The Test Phantom for the Cochlear Implant to Estimate EMI from Cellular Phone

Yoshiaki TARUSAWA  Kohjiroh OHSHITA  Toshio NOJIMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.8   pp.3275-3280
Publication Date: 2005/08/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.8.3275
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section of 2004 International Symposium on Electromagnetic Compatibility)
Category: Biological Effects
Keyword: 
cochlear implant,  cellular phone,  EMI,  phantom,  

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Summary: 
This paper proposes the test phantom for the cochlear implant to estimate electromagnetic interference (EMI) from a cellular phone. This test phantom is constructed from a square tank filled with saline solution. The use of a flat phantom provides a level of consistency in duplicating the exposure conditions in the EMI tests. The measurement and calculation results show that there is no difference in the E-field strength near the surface of the phantom when comparing flat and head-shaped phantoms and that the flat phantom is sufficiently thick to disregard the influence of reflective waves near the surface of the phantom. The calculation results also indicate the appropriateness of using physiological saline (0.18 g/l) up to 3 GHz when comparing the E-field strength inside a phantom comprising physiological saline and in a 2/3 muscle model. The results of actual EMI testing of a cochlear implant show that there is no difference in the maximum interference distance when using either the flat or head-shaped phantom. Based on these results, this paper presents the validity of using the flat phantom in EMI tests from cellular phone for the cochlear implant.