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1.Configuration of Investigation

The following figure shows the configuration when the investigation was conducted.

The pacemaker and the defibrillator were investigated after having been installed within a water tank (biomodel) filled with 0.18wt% of brine.

2.Method of Investigation

As shown in the figure, the investigation was conducted in two different ways, one by the actual mobile telephone and the other by the mobile telephone simulator composed of a high frequency generation machine and a standard dipole antenna.

In the investigation by the actual mobile telephone, the transmission output was controlled by generating a signal from the signal generator, which is equivalent to that of the base station, to stabilize the transmission output, while the mobile telephone itself was controlled by the controller to emit the radio wave sequentially or intermittently.

Contrarily, in the survey by the standard dipole antenna, the controller supplied the standard dipole antenna with the output of the high frequency generation machine simulating a mobile telephone, and the radio wave from the mobile telephone simulator was emitted sequentially or intermittently.

3.Assessment of the Influence of the Radio Wave

A predetermined format of a radio wave was radiated to the target pacemaker, and its operation was recorded for about 25-30 seconds after the irradiation.

If there was a restraint, the extension of the interval, or an irregular generation should occur to pulses of the pacemaker during the application, the whole process of the investigation was conducted again and if these diagnoses should be re-appearing, the influence of the radio wave was determined to have an impact.

In the survey by the defibrillator where the same survey process was applied as in the case of the pacemaker, if a shock current caused the electrical charging to start or a shock current was discharged, the influence of the radio wave was determined to have an impact.

Figure: Measurement System by the Actual Mobile Telephone and Measurement System of the Standard Dipole Antenna
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Copyright(C)Telecommunications Bureau of the Ministry of Internal Affairs and Communications All Rights Reserved.