Figure 4 shows the capacitance and

relative permittivity of the prepared samples.

The three weaves from jute (Hessian type, for packing, and dyed at surface) have different values for

relative permittivity depending on their structural characteristics; see Table 2.

As an example, if the approach is applied to a tooth structure, and its

relative permittivity range is known for tooth enamel and dentine, the search space is bounded within this range (between 1.0 and 10.0).

Finally, the real part of characteristic impedance and effective

relative permittivity are shown in Fig.

Here, to identify the functions of

relative permittivity, relative permeability, and chirality parameter of inhomogeneous chiral layer, their functions are considered as the following Fourier series expansions:

To further analyze the deviation of [S.sub.11] between the experiment and simulation, the computed [S.sub.11] values of the antennas with different

relative permittivity have been shown in Figure 8.

When [tau] = 0 the sample is homogeneous, with a

relative permittivity of [[epsilon].sub.r] = 2.

In (4), [[mu].sub.r] is relative permeability, [k.sub.0] is free pace wave number, j is imaginary unit, [sigma] is conductivity, w is angular frequency, [[epsilon].sub.r] is

relative permittivity, and [[epsilon].sub.0] is permittivity of air.

where [[epsilon].sub.0] is the permittivity of free space, and is the

relative permittivity (often referred to as the dielectric constant).

where [[epsilon].sup.*.sub.r][[mu].sup.*.sub.r], l r are the complex

relative permittivity and permeability of the test specimen, respectively, as defined earlier; [k.sub.0] = [omega]/c is the free space wave number with c being the velocity of light in free space; p represents the broader dimension of the rectangular waveguide.

where [omega] is the frequency of the incident field, [[epsilon].sub.0] the free space permittivity, [sigma] and [[epsilon].sub.r] are the conductivity and

relative permittivity of the material and [phi] is the electric scalar potential.

In addition, we calculated the errors in the real and imaginary parts of the complex

relative permittivity.