A Novel Wearable Circularly Polarized Antenna in Body-Centric Wireless Communications

Abstract:

Wearable, textile-based antennas are dominated research topics for body-centric communications because it could be easily worn on body and integrated into clothes. Since the antenna will operate on a moving person, a circularly polarized antenna is needed in order to optimize the off-body communication link. A wearable circularly polarized textile antenna for body-centric wireless communications is designed in this paper. The proposed antenna is a square-ring microstrip antenna with truncated corners with the bandwidth of 9% when off the body. When it is near the body, we simulate the human body as three-layer model including skin, fat and muscle and put the antenna at different distances to the body. The situation of antenna bending is also simulated at different radii. Specific Absorption Rate was evaluated at last.

• Periodical: Advanced Materials Research (Volumes 403-408)
• Pages: 1946-1949
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.403-408.1946
• Online since: November 2011
• Authors: Ning Liu, Ying Hua Lu, Si Hai Qiu, Peng Li
• Keywords: Antenna, Circularly Polarized, Wearable

References

[1] N. H. M. Rais, P.J. Soh, A Review of Wearable Antenna, 2009 Loughborough Antennas & Propagation Conference, November (2009).

DOI: 10.1109/lapc.2009.5352373

[2] Timothy F. Kennedy, Parick W. Fink, Andrew W. Chu, Nathan J. Champagne, II, Gregory Y. Lin, and Michael A. Khayat, Body-Worn E-Textile Antennas: The Good, the Low-Mass, and the Conformal, IEEE Transactions on Antennas and Propagation, Vol. 57, No. 4, April, (2009).

DOI: 10.1109/tap.2009.2014602

[3] Carla Hertleer, Hendric Rogier, Luigi Vallozzi and Lieva Van langenhove, A Textile Antenna for Off-Body Communication Integrated Into Protective Clothing for Firefighters, IEEE Transactions on Antennas and Propagation, Vol. 57, No. 4, April (2009).

DOI: 10.1109/tap.2009.2014574

[4] Shaozhen Zhu and Richard Langley, Dual-Band Wearable Textile Antenna on an EBG Substrate, IEEE Transaction on Antennas and Propagation, Vol. 57, No. 4, April (2009).

DOI: 10.1109/tap.2009.2014527

[5] C. A. Balanis, Antenna Theory: Analysis and Design, 2nd ed. New York: Wiley, (1996).

[6] Nora Datasheet (Online): http: /www. shieldextrading. net/pdfs/Nora. pdf.

[7] Kin-Lu Wong, Compact and Broadband Microstrip Antennas, New York: Wiley, (2002).

[8] IEEE Standards for Safety Levels with Request to Human Exposure to Radiofrequency Electromagnetic Fields, 3kHz to 300GHz. IEEE Std. C95. 1. (1999).

[9] ICNIRP (International Commission on Non-Ionizing Radiation Protection), Guidelines for limiting exposure to time-varying electric magnetic, and electromagnetic fields (up to 300GHz), Health Phys., vol. 74, pp.494-522, (1998).

DOI: 10.1097/hp.0b013e3181aff9db