Split-Ring Couplers for On-Skin Wi-Fi Communication via an SSPP Waveguide Textile

Abstract

Textile spoof surface plasmon polariton (SSPP) waveguides offer guided on-body links, but their body-facing ground conductors obstruct coupling from on-skin wireless nodes. This letter presents a split-ring coupling interface using local ground recesses at the textile terminations, without patterned garment-side launchers. The capacitively loaded rings are supported by polydimethylsiloxane carriers with a thickness of 2~mm. An image-current model and full-wave simulations examine the effect of backing-ground spacing and determine the recess geometry. For a 450~mm textile waveguide on a water-filled body phantom, the measured $S_{21}$ at 2.45 GHz was $-$18.8~dB, versus $-$60.9~dB without the textile. A 625-position scan showed a maximum 5.1 dB reduction relative to the nominal position within the measured joint $\pm$5~mm placement region. A separate two-node IEEE~802.11n test demonstrated a 65~Mb/s physical-layer (PHY) rate with zero packet errors among 300 frames at $-$20~dBm transmit power through the coupler link. These results establish high-rate, placement-tolerant on-skin Wi-Fi communication through an SSPP waveguide textile.

arXiv comment4 pages, 6 figures