Design of a Dual-Branch Resonator End-Launcher for Low-Loss WBAN Communications Using Wearable Waveguide Surfaces

Wearable waveguide surfaces can be integrated into textiles to improve Wireless Body Area Networks (WBANs). In this work, a compact 30 mm x 30 mm dual-branch resonator end-launcher to enable communication through a waveguide surface manufactured with textile-compatible material at 2.4GHz is proposed. A 25 mm x 25 mm clearance zone area is respected for electronic component integration. The end-launcher topology uses a balanced dual-branch configuration to maximize electromagnetic coupling with the flexible waveguide surface. A design methodology is proposed to co-design the end-launcher and the waveguide surface. Experimental measurements on the human body torso are presented with 0.3 dB/cm insertion loss between 2.4 and 2.48 GHz. The final result is an autonomous, compact, wireless-contact, and battery-powered end-launcher for innovative clothing applications.