We present a wearable passive UHF RFID tag based on a slotted patch antenna comprising only textile materials (e-textile, textile\nsubstrate, and conductive yearn). As a novel manufacturing approach, we realize the patch-to-ground and antenna-to-IC interfaces\nusing only conductive thread and a sewing machine. We outline the electromagnetic optimization of the antenna for body-worn\noperation through simulations and present a performance comparison between the e-textile tag and a tag produced using regular\nelectronics materials and methods. The measured results show that the textile tag achieves the electrical performance required in\npractical applications and that the slotted patch type antenna provides stable electromagnetic performance in different body-worn\nconfigurations.
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