A new broadband textile based PIFA antenna structure designed for wireless body area network (WBAN) applications is presented. The new topology can be directly integrated into clothing. The study starts by considering three different materials: flexible copper foil, and ShieldIt Super and pure copper polyester taffeta conductive textiles. Bandwidth broadening is successfully achieved by implementing a novel and simple slot in the radiating patch. The measured reflection coefficient and radiation characteristics agree well with simulations. Moreover, radiation characteristics and bandwidth show satisfactory immunity against detuning when operating on-body, especially when placed on the back. To our knowledge, the proposed structure is the first fully fabric based slotted PIFA to be reported in open literature with high bandwidth (more than 46%) and reasonable gain (ca. 1.5 dB), to be used for multiple applications in the frequency band of 1.8 to 3.0 GHz. Index Terms-Broadband antennas, conformal antennas, planar inverted-f antennas (PIFA), textile antennas.
A novel, dual-band wearable textile antenna fabricated using conductive textiles for operation in both ISM and HiperLAN applications is presented. Its concept is based on the suspended plate antenna. It features a 60×45 mm 2 rectangular radiating element suspended over a 80×60 mm 2 ground plane using a 5 mm foam substrate. The proposed rectangular radiator is modified using slots, slits, and shorting posts to enable dual-band resonance and broad bandwidths in both frequency bands: 277 MHz (2.22 to 2.48 GHz) in the ISM and 850 MHz (4.95 to 5.80 GHz) in the HiperLAN band. The antenna radiates uni-directionally and the ground plane avoids coupling to the users' body. The SP-WTA shows a total efficiency between 67 % and 89 % and a peak gain of 8.33 dB.
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