Design of a low-cost steerable textile antenna array operating in varying relative humidity conditions



A new wearable textile antenna array, operating in the 2.45 GHz industrial, scientific, and medical band, is described.Its purpose is to increase signal levels in off-body indoor communication links thanks to the array gain. In addition, multipath fading is reduced, thanks to its narrow beamwidth. As antenna substrate, we compare two textiles that have very different moisture regains, being cotton fabric and polyurethane foam and evaluate the array performance under varying relative humidity conditions in a controlled environment. Relative humidity has little influence on the mutual coupling, whereas for the reflection coefficients, the array constructed on foam material exhibits the most stable antenna characteristics. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:40–44, 2012; View this article online at DOI 10.1002/mop.26510