手機及車頂發射器對救護車內部之電磁干擾

Electromagnetic Interference in an Ambulance Due to Radiated Fields from Cellular Phones and Roof Transmitters

王俊凱(Chun-Kai Wang)

指導教授 ： 陳興義

元智大學/電機通訊學院/通訊工程學系/碩士(2013年)

https://doi.org/10.6838/YZU.2013.00256

摘要

本論文利用時域有限差分法模擬計算救護車內使用手機及車頂發射天線輻射時救護車內電場分佈情形。當救護車內使用手機時，亦使用Narda Model SRM-3000高頻率輻射量測儀進行救護車內電場強度的量測。根據模擬和實測的結果，在救護車內使用手機可能使得救護車內電場超過IEC對醫療器材所規定的3 V/m電場抗擾度。本研究建議救護車內使用手機與醫療儀器保持30公分以上以避免發生電磁干擾現象。根據模擬結果，車頂發射天線輻射時，若在救護車車頂為金屬材質時，車內的電場低於3 V/m電場抗擾度；若救護車車頂為非金屬材質時，車內的電場會高於3 V/m電場抗擾度。

關鍵字

電磁干擾 ； 時域有限差分法

並列摘要

The Finite-Difference Time-Domain (FDTD) method was used to calculate the electric fields emitted from cellular phones inside an ambulance and from a transmitter on the ambulance roof. Measurements of the electric fields emitted from cellular phones inside the ambulance were also performed by using a Narda Model SRM-3000 high frequency selective radiation meter. From measurement and simulation results, it is found that electric field strengths emitted from cellular phones inside the ambulance may be over the recommended EMI immunity level of 3 V/m set by the IEC for medical devices. An interference threshold separation distance of 30 cm is proposed for evaluating the interaction between cellular phones and medical devices inside an ambulance. Simulation results of interior electric fields emitted from a transmitter on an ambulance roof made of metallic material are found not to exceed the 3 V/m standard immunity level. However, electric field strengths inside the ambulance with a roof made of non-metallic material are found to exceed the 3 V/m standard immunity level.

並列關鍵字

FDTD ； EMI

參考文獻

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