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Wearable Textile Antennas: Examining the effect of bending on their performance.

Ferreira, D. ; Pires, P. A. S. ; Rodrigues, R. G. ; Caldeirinha, Rafael

IEEE Antennas and Propagation Magazine Vol. 59, Nº 3, pp. 54 - 59, June, 2017.

ISSN (print): 1045-9243
ISSN (online):

Journal Impact Factor: 1,312 (in 2008)

Digital Object Identifier: 10.1109/MAP.2017.2686093

Abstract
This paper presents a study on the effect of bending on the performance of a rectangular textile patch antenna operating at 2.4 GHz ISM band. The substrate of the antenna was made from denim textile and the conducting layers made from a copper and nickel plated polyester fabric. A parametric study was made to determine the influence of antenna bending, around both its length and width, on its performance parameters in situations such as a chest, leg, arm or wrist integration for wireless body-area network (WBAN) scenarios. Results were obtained from bench and anechoic chamber measurements and compared with simulation results. The prototype presents a maximum gain of approximately 4 dBi and 70º of half-power beamwidth (HPBW) in flat position. When subjected to a wrist equivalent bending, the gain decreases by 2 dB, HPBW has an increase of about 25º and front-to-back radiation ratio decreases. Mean and standard deviation parameters as function of bending curvature were calculated from parametric simulations.