Experimental investigation into improving the detectability of passive RFID tags

This paper describes an experimental investigation into improving the detect-ability of passive RFID tags. Previous work published by the authors considered a novel passive chip less RFID tag for subcutaneous implant. This work investigates practical validation of gain enhancement techniques, aiming to improve tag detect-ability in the highly attenuating environment of the human body. Two passive tags are considered, a uniform cross shaped resonator, and a folded (Gammadion) cross having a physical aperture 45% less than that of the uniform cross. Arrays of elements have been used to improve the detect-ability of the tag. It has been shown that with the folded cross it was possible to accommodate more elements on the tag without increasing the original physical aperture. Improved tag detect-ability with reduced size is ideal for any implantable medical device.