In recent years, advancements in the field of wireless communications have led to a proliferation of devices emitting and receiving radio frequencies in the 2.4-gigahertz (GHz) frequency region, also known as the 2.4GHz unlicensed Industrial, Scientific and Medical (ISM) band. These recent advances in wireless technology such as Wireless Local Area Network (WLANs) (e.g. 802.11 (Wi-Fi), Wireless Person Area Networks (WPANs) including short-range wireless systems such as Bluetooth, and wireless telemetry equipment for patient monitoring, offer great opportunities for more advanced, efficient and cost effective communications in healthcare facilities. However, the popularity of such devices has the potential to lead to electromagnetic interference (EMI) between electronic transmitting devices and medical equipment, and to disruption in essential communications caused by interference from other devices using the increasingly overloaded ISM band. Problems occur since the EMI could lead to subtle malfunctions of medical equipment that might go undetected for long period. Most importantly, such EMI has the potential to cause malfunction that could impact upon patient safety.

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