and nonconductive textile (bottom figure), the textile is placed on the body modeled by air-tissue half-space, according to embodiments of the present disclosure; [0031] FIG. 1D is a schematic illustration of normalized field distribution on the ’yz’plane and field profile along the dashed line, according to embodiments of the present disclosure; [0032] FIG. 1E is a schematic illustration of dispersion curve of the metamaterial structure, according to embodiments of the present disclosure; [0033] FIG. 1F is a schematic illustration of comparison of the normalized power flow (peak value of the Poynting vector) with distance from transmitter near the textile (confined) and in free-space (radiative), according to embodiments of the present disclosure; [0034] FIGS. 2A-C are schematic illustrations of devices constructed from the metamaterial textiles: (A) power divider, (B) antenna, and (C) ring-resonator, respectively, according to embodiments of the present disclosure; [0035] FIGS. 2D-F are schematic illustrations of simulation (left) and near-field measurement (right) of the normal component of the electric field above the textile surface during continuous wave excitation at position 1 with a dipole probe, according to embodiments of the present disclosure; [0036] FIGS. 2G-I are schematic illustrations of transmission spectra between antennas placed 5 mm above labeled positions on the body, according to embodiments of the present disclosure; [0037] FIG. 3A is a schematic illustration of wireless network of two Bluetooth nodes (sensors 1 and 2) simultaneously transmitting data to a smartphone (hub), according to embodiments of the present disclosure; [0038] FIG. 3B is a schematic illustration of full-wave simulations of wireless transmission in a computational human body model, according to embodiments of the present disclosure; [0039] FIG. 3C is a schematic illustration of a relative signal strength indicator (RSSI) recorded by the smartphone from each sensor during physiological activity, according to embodiments of the present disclosure; [0040] FIG. 3D is a schematic illustration of a comparison of RSSI averaged across each activity, according to embodiments of the present disclosure; [0041] FIG. 3E is a schematic illustration of wireless transmission (Bluetooth) latency as a function of transmit power, according to embodiments of the present disclosure; [0042] FIG. 3F is a schematic illustration of cumulative transmission time as a function of number of packets, according to embodiments of the present disclosure; [0043] FIG. 3G is a schematic illustration of signal strength from sensors as a function of distance from the position of the smartphone, according to embodiments of the present disclosure;