Wearable Wideband High-Gain Low-SAR Antenna with Bending and Wet Conditions Analysis at Sub-6 GHz 5G Band

A rhombus shaped wearable textile patch antenna with inset-fed concept for sub-6 GHz 5G is proposed in this paper. By introducing rhombus-shape structure for the first time in the wearable antenna domain, the gain of the antenna has been enhanced significantly. The Felt substrate used has relative permittivity of 1.45 and thickness of 3 mm. The proposed antenna with a total size of 60 mm x 57 mm operated at n78 and n77 band of the sub-6 GHz with overall bandwidth of 300 MHz when placed on-body and gain value of 5.099 dBi when bent at 30 degrees in free space. Besides, the antenna was robust in operating at the desired frequency at bending and fully wet condition. The proposed antenna achieved good directional radiation patterns, low SAR value and high antenna gain at the desired frequency band. The proposed design can be a valuable candidate for body-centric wearable communications.