with the addition of the width of a gap 124, each gap 124 being located between two adjacent teeth 122 . 

[00104] Reference is now made to FIG. 5A(2), which is a schematic flow chart depicting a method for designing and accordingly manufacturing metamaterial textile, according to embodiments of the present disclosure. According to some embodiments, the conditions required for a metamaterial to support radio-frequency waves while bound to the surface of the body were examined. 

[00105] The metamaterial textile may be designed by determining the geometrical parameters of the structure in order to support a surface mode with a desired wavenumber β at the design frequency f . That is, in order to support a surface mode with a desired wavenumber s at frequency fO, the geometrical parameters of the metamaterial textile may be changed and controlled. The resulting surface plasmon wavelength is given by: A$_{s}$ = 2 / β . The decay length is: q 1 = 1 / β | —( ω /c) 2 , where ω is the angular frequency and c is the speed of light. The decay length may determine the distance at which wireless devices may interact with the metamaterial textile. According to some embodiments, the decay length may be increased to enable greater range of communication with wireless devices or may be reduced for improved signal security. 

[00106] According to some embodiments of the disclosure, the design procedure proceeds as follows: 

[00107] (1) The length of each tooth or unit cell of the comb-like structure of the metamaterial textile is set to: d = 0.2 A$_{s}$ . Simulations show that ’ d ’ has negligible effect on β if it is significantly subwavelength, while larger values of ‘d’ result in designs that are easier to fabricate. 

[00108] (2) The parameters of the comb-like structure are set as a = 0.5d and b = 0.75d. These choices result in a comb structure that has large feature sizes and can be easily fabricated, but are otherwise arbitrary as simulations shows that β is largely insensitive to ‘ a ’ and b ’ . However, β can be tuned over a broad range by h ’ . 

[00109] (3) Parameter h is initialized to: h = T C/ (4 tex f$_{0}$) where tex is the relative dielectric permittivity of the textile. 

[001 10] (4) The width of the bottom non-conductive textile layer is set to: w = a + h. Larger choice of w results in greater suppression of signals coupling to the body, while smaller choice of w minimizes the area of conductive textile required. 

[00111] (5) Given the thickness of the metamaterial textile, t$_{f}$ , the dispersion curve of the structure is obtained by an eigenmode solver with varying ’h’between 0.5h and 2h , yielding the value for which β = β . 

