Effects of human body and antenna orientation on dipole textile antenna performance and SAR

Abstract

Wearable textile antennas are supposed to be integrated within the clothing or secured on the body. Therefore, the placement of the antennas and their orientation need to be carefully determined. In this paper, the interaction between a single band dipole textile antenna for wireless off-body communication applications with human body is examined. The simulations are performed by means of CST Microwave Studio with a single band 2.4 GHz patch dipole antenna as the radiating source. The effects of human body are taken into account and different antenna orientations, locations and distances from the body are also considered in this study. Results have clearly indicated that the human body has notably shifts the antenna resonant frequency and modifies the radiation pattern at the frequency investigated. Furthermore, the results obtained show that the SAR values are significantly influenced by the antenna orientation and position. SAR is increased by utmost 16 % when the textile antenna is horizontally orientated compared to antenna in vertical orientation.