Evaluation of EMI risk due to the interaction between cellular phones and medical devices
✍ Scribed by Hsing-Yi Chen; Cheng-Yi Chou
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 837 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
The FDTD method was used to calculate the electric fields emitted from cellular phones.Cellular phones were modeled by a quarter‐wavelength monopole antenna mounted on a rectangular box with equivalent material in the interior of the rectangular box and a dielectric coating in the exterior of the rectangular box. Measurements of the electric fields emitted from cellular phones were also performed by using a Narda Model SRM‐3000 high frequency selective radiation meter with an isotropic E‐field probe. From measurement and simulation results, electric fields emitted from cellular phones are in the range of 0.02–39.0 V/m for separation distances of 0–3 m between handsets and test points. It is found that field strengths emitted from cellular phones may meet the recommended EMI immunity level of 3 V/m set by the IEC for medical equipment keeping a separation distance of more than 1 m from cellular phones. An interference threshold separation distance of 3 m is proposed for evaluating the interaction between cellular phones and medical devices. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1449–1454, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25221