Electromagnetic interference with medical devices from mobile phones using high-speed radio access technologies

Nagase, Kazuhiko; Ishihara, Satoshi; Higashiyama, Junji; Onishi, Teruo; Tarusawa, Yoshiaki

doi:10.1587/comex.1.222

Cited by 6 publications

(8 citation statements)

References 2 publications

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“…NTT DOCOMO, INC. and the Ministry of Internal Affairs and Communication in Japan (MIC) use these antennas in evaluating EMI [2], [13], [14]. In this study, the 800 MHz, 1.5 GHz, 1.7 GHz, and 2 GHz bands defined by 3rd Generation Partnership Project (3GPP) are used.…”

Section: Electric Field Distribution Around Radiation Sourcesmentioning

confidence: 99%

“…Therefore, many EMI evaluations were conducted and reported on this topic inside and outside Japan [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. As the transmission method for mobile phone system, Long Term Evolution (LTE), High Speed Packet Access (HSPA), Wideband Code Division Multiple Access (W-CDMA), Personal Handy-phone System (PHS), Personal Digital Cellular (PDC; Japanese second generation system), and the Global System for Mobile Communications (GSM), and so on were selected.…”

Section: Introductionmentioning

confidence: 99%

“…The Kanazawa University Hospital and NTT DOCOMO, INC. reported that the difference in the Peak-to-Average Power Ratio (PAPR) among LTE, HSPA, and W-CDMA does not have a significant effect on EMI [13]. Furthermore, we investigated and reported regarding reduction of EMI evaluation time [14].…”

Section: Introductionmentioning

confidence: 99%

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Electric field evaluation around radiation sources used for EMI test with medical devices from mobile terminals

Ishihara¹,

Onishi²

2015

2015 9th International Symposium on Medical Information and Communication Technology (ISMICT)

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Electric field distributions around a half-wave dipole antenna, broadband antenna, and various mobile terminals are evaluated and compared in the frequency bands of 800 MHz, 1.5 GHz, 1.7 GHz, and 2 GHz to confirm the difference among radiation sources when conducting EMI tests on medical devices. Comparison results show that the electric field strengths around dipole antennas is almost equal to or higher than those of all mobile terminals used in this study for all the considered frequency bands. Consequently, a half-wave dipole antenna can be used for screening test of EMI with medical devices. With respect to mobile terminals, the maximum difference in the electric field strength among all the terminals is approximately 9 and 5 dB for the 800 MHz and 2 GHz bands, respectively. Regarding broadband antenna used in this study, it can be used for screening test of EMI in the frequency bands of 1.5, 1.7, and 2 GHz.

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Section: Electric Field Distribution Around Radiation Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electric field evaluation around radiation sources used for EMI test with medical devices from mobile terminals

Ishihara¹,

Onishi²

2015

2015 9th International Symposium on Medical Information and Communication Technology (ISMICT)

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“…Our research group has investigated such EMI regarding radio waves transmitted from mobile phones including Wideband Code Division Multiple Access (W-CDMA), High Speed Uplink Packet Access (HSUPA), and Long-Term Evolution (LTE) with multiple frequency bands [13] [14]. New Radio access technology (NR), which is used in the 5th Generation (5G) mobile phones, and Wireless Local Area Network (WLAN) were also included in such radio waves, and totally 116 medical devices have been investigated using at least one type of radio waves described above.…”

Section: Introductionmentioning

confidence: 99%

Dependency of Waveforms in Intermittent Transmission at Mobile Phone Frequencies on Electromagnetic Interference With Medical Devices

Iyama,

Ishioka,

Higashiyama

et al. 2024

IEEE Access

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This study focuses on the effect of waveforms, i.e., signal length and period in intermittent transmission, for electromagnetic interference (EMI) on medical devices. It was already shown that the intermittent transmission with the period of 1 s (500 ms: ON and 500 ms: OFF) tends to cause EMI on medical devices compared to continuous transmission. To evaluate the impact of waveforms for EMI on medical devices, we conducted an experiment at 837.5 MHz and 1950 MHz using five medical devices that yielded the following results. For EMI dissipation, the input power of antenna simulating mobile phones increased and the separation distance between an antenna and medical device decreased as the signal length became shorter in the case of a signal length of less than 10 ms. On the other hand, the signal period exhibited no specific tendency regarding such power and distance. We confirmed that previous EMI tests, in which we used a radio signal with the length and period of 100 ms in intermittent transmission, were conservative from the viewpoint of waveforms. Results of this study indicate that the influence of EMI on medical devices does not depend on the average power but on the burst power. Based on this, EMI characteristics on medical devices for a certain radio system could be estimated based on previous EMI test results for other radio systems if their frequencies are close to each other and the signal specifications of them are clearly determined.

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“…Using mobile phones in the vicinity of medical devices incurs the risk of electromagnetic interference (EMI) to these medical devices [1]. In 2014, the Electromagnetic Compatibility Conference Japan (EMCC) updated guidelines for using mobile phones and other devices in hospitals [2].…”

Section: Introductionmentioning

confidence: 99%

Transmit power measurement results of configured-maximum-transmit-power-controlled mobile phones in hospital

et al. 2021

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Reducing the transmit power of mobile phones is effective in preventing electromagnetic interference (EMI) with medical devices in hospitals. However, to our best knowledge, no study has shown transmit power measurement results of mobile phones for which the configured-maximumtransmit-power was controlled by specific base station (BS) parameters. This letter shows transmit power measurement results from a mobile phone for which the configured-maximum-transmit-power is experimentally controlled by indoor BSs in a hospital. Reduction in the mobile phone transmit power and the issue of preventing EMI with medical devices are discussed based on the measurement results.

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Electromagnetic interference with medical devices from mobile phones using high-speed radio access technologies

Cited by 6 publications

References 2 publications

Electric field evaluation around radiation sources used for EMI test with medical devices from mobile terminals

Electric field evaluation around radiation sources used for EMI test with medical devices from mobile terminals

Dependency of Waveforms in Intermittent Transmission at Mobile Phone Frequencies on Electromagnetic Interference With Medical Devices

Transmit power measurement results of configured-maximum-transmit-power-controlled mobile phones in hospital

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