A body wearable antenna is supposed to wear on body. It is not possible to keep this antenna in flat condition on different parts of body. It may be subjected to deformation/bending due to movement of body part on which it is mounted. It is expected that the performance of antenna should not change drastically with amount of bending/deformation. So a wearable antenna should also perform efficiently even in bending condition also. In this paper a body wearable antenna has been designed using polycot textile substrate of 3 mm having dielectric constant of 1.48 operating at 2.4 GHz resonant frequency used for ISM band. Bandwidth and S-parameter of antenna having a polycot material (combination of curtain cotton and polyester) as a substrate is measured. Gain and directivity of same antenna has been observed in flat as well as bending condition.

ISM band, body wearable, bending effect, textile material

[1] A. Tronquo, H. Rogier, C. Hertleer, and L. Van Langenhove, “Robust planar textile antenna for wireless body LANs operating in 2.45 GHz ISM band,” Electron. Lett., Vol.42, pp.142–143, 2006.
[2] C. Hertleer, A. Tronquo, H. Rogier, L. Vallozzi, and L. Van Langenhove, “Aperture-coupled patch antenna for integration into wearable textile systems,” IEEE Antennas Wireless Propag. Lett., Vol.6, pp.392–395, 2007.
[3] P. Salonen and Y. Rahimat-Samii, "Textile antennas: effects of antenna bending on input matching and impedance bandwidth," in IEEE Aerospace and Electronic Systems Magazine, Vol.22, No.3, pp.10-14, 2007.
[4] S. Zhu and R. Langley, "Dual-band wearable antennas over EBG substrate," in Electronics Letters, Vol.43, No.3, pp.141-142, 2007.
[5] R. Salvado, C. Loss, R. Gonçalves and P. Pinho, “Textile materials for the design of wearable antennas: A survey”, Sensors, 12, pp.15841–15857, 2012.
[6] S. Brebels, J. Ryckaert, B. Come, S. Donnay, W. D. Raedt, E. Beyne, and R. P. Mertens, “SOP integration and codesign of antennas,” IEEE Trans. Adv. Packag., Vol.27, pp.341–351, 2004.
[7] C. Hertleer, A. Van Laere, H. Rogier, and L. Van Langenhove, “Influence of relative humidity on textile antenna performance,” Textile Res. J., Vol.80, No.2, pp.177–183, 2010.
[8] I. Locher, M. Klemm, T. Kirstein, and G. Tröster, “Design and characterization of purely textile patch antennas,” IEEE Trans. Adv. Packag., Vol.29, No.4, pp.777–788, 2006.
[9] Z. Wang, L. Zhang, D. Psychoudakis, J.L. Volakis, “Flexible textile antennas for body-worn communication,” 2012 IEEE International Workshop on Antenna Technology (IWAT), pp.205– 208, 2012.
[10] A. Tronquo, H. Rogier, C. Hertleer, and L. Van Langenhove, "Applying textile materials for the design of antennas for wireless body area networks," in Proc. 1st European Conference on Antennas and Propagation, pp.1-5, 2006.
[11] P. Salonen, Y. Rahmat-Samii, M. Schaffrath, and M. Kivikoski, “Effect of textile materials on wearable antenna performance: A case study of GPS antennas,” in Proc. IEEE Antennas Propag. Soc. Int. Symp., Vol.1, pp.459–462, 2004.
[12] C.A. Balanis, Modern Antenna Handbook 3rd edition. A John Wiley and Sons, Inc., Publications, 2005.
[13] S. Sankaralingam and B.Gupta, “Development of Textile Antennas for Body Wearable Applications and Investigation of Their Performance under Bent Conditions,” PIER B, Vol.22, pp.53-71, 2010.
[14] U. Ali, S. Ullah, J. Khan et al., “Design and SAR analysis of wearable antenna on various parts of human body, using conventional and artificial ground planes,” Journal of Electrical Engineering and Technology, Vol.12, No.1, pp.317–328, 2017.