Effectiveness in Preventing Malfunctions in Wireless Devices

Effectiveness of the MG Vest in Preventing PM Malfunctions from Wireless Devices

Objective

This experiment evaluated whether the MG Vest could prevent malfunctions of pacemakers (PM) caused by electromagnetic waves emitted from wireless devices.

Method

A human phantom was equipped with a pacemaker (PM), and a log-periodic antenna was positioned directly in front, as shown in Figure 1. The transmitter output was 60W, modulated with a 60Hz pulse on a 830MHz carrier. The 830MHz frequency was chosen to simulate mobile phone signals, and the 60Hz pulse modulation was used to mimic the PM's basic rate, creating conditions that would easily induce malfunction. The test was conducted in a radio anechoic chamber.

Figure 1: Human Phantom and Log-Periodic Antenna

Result

As a result of the test, a malfunction occurred in 1 out of 10 pacemaker models. (Table 1)

Table 1: Number of Malfunction Occurrences

Discussion

Since illegal radios often use pole antennas, it is necessary to conduct tests using such antennas. Additionally, because some illegal radios have an output of up to 1 kW, testing with higher-output devices is also required.

Conclusion

This test demonstrated a case in which the MG Vest effectively shielded radio waves from a wireless device and prevented inappropriate operation of a pacemaker.