Investigation of crumpling effects on EM absorption and antenna performance at 2.4 GHz

This paper discusses the performance and SAR of dipole textile antenna under different crumpling conditions in the presence of human body close to the radiation source. The numerical simulations of the realistic complex two dimensional crumpling is performed by using Finite Integration Technique (FIT) which is applied in Computer Simulation Technology (CST) Microwave Studio. A realistic heterogeneous Voxel body model is used in the simulation and has been exposed to a simple dipole textile antenna at 2.4 GHz. Results have been compared with equivalent homogeneous model to further validate the results. The results obtained show that the antenna crumpling has prominent effect on the antenna performance and could enhance the 10 g SAR up to 18.2 % from the reference SAR (flat condition). Hence, the antenna crumpling may contribute to higher penetration of the radiation through human body tissue.

[1]  Noor Asmawati Samsuri,et al.  Embroidered Fully Textile Wearable Antenna for Medical Monitoring Applications , 2011 .

[2]  Qiang Bai,et al.  Crumpling of PIFA Textile Antenna , 2012, IEEE Transactions on Antennas and Propagation.

[3]  Yahya Rahmat-Samii,et al.  Textile antennas: effects of antenna bending on input matching and impedance bandwidth , 2006, IEEE Aerospace and Electronic Systems Magazine.

[4]  Richard J. Langley,et al.  Crumpled integrated AMC antenna , 2009 .

[5]  M. K. A. Rahim,et al.  Effects of human body and antenna orientation on dipole textile antenna performance and SAR , 2012, 2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE).

[6]  Richard J. Langley,et al.  Crumpled textile antennas , 2009 .

[7]  A. Ahlbom.  Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998 .

[8]  M. Kivikoski,et al.  Wearable antennas in the vicinity of human body , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[9]  M. Tanaka,et al.  Wearable microstrip antenna , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[10]  Kamilia Kamardin,et al.  Design, implementation and performance of ultra-wideband textile antenna , 2011 .

[11]  G. Troster,et al.  Design and Characterization of Purely Textile Patch Antennas , 2006, IEEE Transactions on Advanced Packaging.

[12]  Qiang Bai,et al.  Wearable EBG antenna bending and crumpling , 2009, 2009 Loughborough Antennas & Propagation Conference.

[13]  Koichi Ito,et al.  Design and characterization of an UWB wearable antenna , 2010, 2010 Loughborough Antennas & Propagation Conference.

[14]  M. K. A. Rahim,et al.  Design and analysis UWB wearable textile antenna , 2011, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP).

[15]  Yang Hao,et al.  Time domain characterisation of ultra wideband wearable antennas and radio propagation for body-centric wireless networks in healthcare applications , 2008, 2008 5th International Summer School and Symposium on Medical Devices and Biosensors.

[16]  M. K. A. Rahim,et al.  The effects of human body and bending on dipole textile antenna performance and SAR , 2012, 2012 Asia Pacific Microwave Conference Proceedings.

[17]  Yang Hao,et al.  Characterisation of ultra wideband wearable antennas and body-centric wireless-networks in indoor environment , 2008, 2008 European Conference on Wireless Technology.

[18]  Y. Rahmat-Samii,et al.  Effect of conductive material on wearable antenna performance: a case study of WLAN antennas , 2004, IEEE Antennas and Propagation Society Symposium, 2004..