[00112] Although in other embodiments, the initial values for ’ d ’ a ’ b ’ , and ’ h ’ may be different, all of the abovementioned steps need to be performed in order to obtain a structure for which β may be calculated. 

[00113] A detailed explanation of the method according to some embodiments of the disclosure for designing and accordingly manufacturing metamaterial textile is hereby provided. A model of the interface between air and the body consisting of a half-space that is free-space in the upper region z > 0) and filled with biological material with a relative dielectric permittivity $_{¾0dy}$in the lower region z < 0) was used. Taking x to be the direction of propagation, a thin planar metamaterial placed on the interface z = supports a mode whose electric field in the upper (El) and lower (E2) region is given by 

where E is the field amplitude, co the frequency, β the wavenumber and a$_{n}$ the decay parameter in each region. The form of equation (1) is dictated by symmetry considerations, while the design of the metamaterial determines the relationships between the parameters β , co and a$_{n}$. For a plasmonic metamaterial, β and co are related by a surface plasmon dispersion relation, whose curve lies to the right of the light line β = ω /c, where c is the speed of light, and approaches an asymptotic limit termed the surface plasma frequency. The decay parameter for the free-space region is given by = β 2 — which, together with the dispersion relation, implies that the mode is bound to the upper surface because a \ is purely real. The lower region, however, supports additional bulk radiative modes within the region 

β < due to the presence of biological tissue. Remarkably, these modes encompass nearly all frequencies below the surface plasma frequency because of the very high dielectric permittivity of biological tissue at radiofrequencies. To allow bound surface modes to exist on the body, the metamaterial should therefore support a single-sided mode 2 ∞ to prevent coupling to these bulk radiative modes and leakage into the lower region. 

[001 14] In addition to supporting surface modes, the metamaterial must also be able to interact with nearby sensors and devices without physical contact. The interaction of the surface waves with a wireless device can be described by expanding the electric field into forward (+) and backward (-) propagating surface modes E(r,f) = ($_{2}$$_{+}$e$_{+}$(r) + a r))e where a are the mode amplitudes are the mode field patterns 

