Towards Washable Wearable Antennas: A Comparison of Coating Materials for Screen-Printed Textile-Based UHF RFID Tags

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td align="left">Coating</td><td align="center">Thickness <br/>(two layers + fabric)</td><td align="center">Notes</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td align="left">Epoxy</td><td align="center">0.5 to 1 mm</td><td align="center">Is absorbed and spreads; all the measured tags have broken t-match </td></tr><tr><td align="left">Acrylic</td><td align="center">5 to 8 mm</td><td align="center">Hard lump</td></tr><tr><td align="left">Silicone</td><td align="center">2 to 3 mm</td><td align="center"> </td></tr><tr><td align="left">Latex</td><td align="center">1.5 to 2 mm</td><td align="center"> </td></tr><tr><td align="left">PVA1</td><td align="center">1.5 to 2 mm</td><td align="center"> </td></tr><tr><td align="left">PVA2</td><td align="center">1.5 to 2 mm</td><td align="center"> </td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Observations and thicknesses of the tags with a coated IC. Fabric A is approximately 0.4 mm thick and Fabric B 0.8 mm thick. The IC strap is 0.3 mm thick.

International Journal of Antennas and Propagation

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Table 3

Table 3: Towards Washable Wearable Antennas: A Comparison of Coating Materials for Screen-Printed Textile-Based UHF RFID Tags 