  For smart clothing integration with the wireless system based on radio
frequency (RF) backscattering, we demonstrate an ultra-high frequency (UHF)
antenna constructed from embroidered conductive threads. Sewn into a fabric
backing, the T-match antenna design mimics a commercial UHF RFID tag, which was
also used for comparative testing. Bonded to the fabric antenna is the
integrated circuit chip dissected from another commercial RFID tag, which
allows for testing the tags under normal EPC Gen 2 operating conditions. We
find that, despite of the high resistive loss of the antenna and inexact
impedance matching, the fabric antenna works reasonably well as a UHF antenna
both in standalone RFID testing, and during variety of ways of wearing under
sweaters or as wristbands. The embroidering pattern does not affect much the
feel and comfort from either side of the fabrics by our sewing method.
