Dual-Band Planar Magneto-Inductive Waveguide for WiFi Operating Frequencies

This paper presents a dual-band planar magneto-inductive waveguide (MIW) designed for wireless body area network (WBAN) applications operating at WiFi frequencies of 2.45 GHz and 5 GHz. The MIW leverages magneto-inductive wave propagation to enable low-loss, non-radiative communication, making it a promising alternative to conventional RF-based methods. A theoretical formulation is developed to optimize the MIW’s dispersion characteristics, followed by full-wave electromagnetic simulations of a finite 11-loop structure. Results demonstrate low transmission losses of 1.53 dB and 1.44 dB at the respective frequency bands, with bandwidths of 500 MHz and 670 MHz. Specific absorption rate (SAR) analysis confirms safe operation with peak SAR values well below FCC limits. Furthermore, the MIW’s performance remains robust in the presence of fabric substrates and human tissue, validating its suitability for wearable applications.