Design of multiband wearable rectangular slot antenna for WIMAX and WLAN applications

Abstract

The design of multiband wearable rectangular slot antenna operating at 2.9 GHz, 3.9 GHz and 5.1 GHz bands is explained in this paper. Wearable antenna requires certain conditions to be fulfilled like miniature size, weightless structure, physical flexibility, less maintenance and also operating with minimal degradation in proximity to the human body. Denim is used as a substrate material and Silver is used as a conducting material to meet the above requirements. The dimensions of the proposed design is 68x60 mm2. The simulated S-Parameter, VSWR, Gain and Directivity of the new design shows better performance. For the multiband operation the proposed antenna has a gain of 5.117 dB, 5.023 dB and 8.462 dB with VSWR of 1.517, 1.816 and 1.173 for 2.9 GHz, 3.9 GHz and 5.1 GHz respectively. The effects of electromagnetic radiation on the human body has also been analysed. The SAR was measured from the antenna by using the Voxel model. SAR values of the proposed design shows 0.8722 W/kg, 1.49 W/kg and1.44 W/kg as average values. It’s evident from the measured values that the antenna meets the SAR limits recommended by the ICNIRP, which is 1.6 W/kg averaged over 1 g of tissue. Computer Simulation Technology (CST) Microwave Studio package 2017 has been used for simulation purpose. This antenna design can be used for various applications under WiMAX and WLAN bands.