Design of wearable communication device for body protection from EM wave using the EBG structure

This paper presents a wearable communication device for body protection from electromagnetic wave using a electromagnetic bandgap (EBG) structure at a WCDMA band. Since wearable wireless communication devices are worked in the proximity or contact of the human body, a health risk from a electromagnetic fields generated by body worn devices is important. The EBG structures can suppress the propagation of surface current and act as a perfect magnetic conductor. Thus, it is capable of preventing a undesired electromagnetic wave from the wireless communication devices. The proposed wearable communication device has the PIFA with the EBG structure at a WCDMA band, frequency generator for the SAR testing and a dielectric case. It is a kind of watch phone worn on the human wrist. Simulation and experimental results demonstrate S-parameter, radiation pattern and the SAR value of the proposed structure.