摘要
Coil structures are fundamental components in high-frequency (HF) radio frequency identification (RFID) and wireless power transfer (WPT) systems. Integrating such structures into textiles enables new possibilities for wearable and flexible electronic devices. However, washability remains one of the key challenges in textile electronics, since exposure to water, detergent, and mechanical agitation can significantly degrade the performance of conductive materials. In this study, a washable conductive silver-neoprene ink was developed for screen printing textile-based coil structures. The ink formulation was optimized to achieve a balanced combination of electrical conductivity, mechanical flexibility, and strong adhesion to textile substrates. Experimental results show that the printed coils maintain low resistance and stable electrical performance even after multiple laundering cycles. The improved durability originates from the elastomeric neoprene binder, which preserves the conductive network integrity under repeated mechanical deformation and washing. These results demonstrate the potential of the proposed conductive ink for the fabrication of durable textile electronic systems, including wearable RFID tags and textile-integrated wireless charging modules.