It provides tympanograms of admittance (Y),

susceptance (B), and conductance (G) at each frequency.

Our formulation is based on a standard direct current (DC) load-flow model in order to linearize loop flows in a power system resulting from KirchhofFs laws, which uses the network transfer matrix H and the

susceptance matrix B with the voltage angle v (Schweppe et al, 1988; Gabriel and Leuthold, 2010).

The sheet with well-designed parameters (permittivity, thickness, and height above the array) acts as a shunt

susceptance to achieve an impedance match at one scan angle.

where "G" is the conductance of the line and "B" is the

susceptance (R and X being the resistance and reactance).

The admittance Y([omega]) is represented as a shunt circuit composed of a conductance G([omega]) and a

susceptance B([omega]), where G([omega]) emulates the conductive pathways of the tissue and B([omega]) accounts for the electric field effect.

[G.sub.ki] and are [B.sub.ki] the transfer conductance and

susceptance between bus k and bus i respectively.

The proposed power resolution is based on the separation of load current into orthogonal components as active, reactive, scattered conductance, scattered

susceptance, unbalanced conductance and unbalanced

susceptance currents, which are all related to the conductance and

susceptance parameters of the load.

where [V.sub.i] is the voltage of node i and [G.sub.ij], [B.sub.ij], and [[theta].sub.ij] are the conductance,

susceptance, and phase angle of branch ij.

A complete SVC

susceptance and firing angle models are suitable for conventional and optimal power flow analysis.

where i = 1,2,3, ..., NB, [P.sub.Gi], is real power output, [P.sub.Di] is real power demand, [Q.sub.Gi], is reactive power output, [Q.sub.Di] is reactive power demand at the ith bus, [B.sub.ij] is

susceptance of the line, [[theta].sub.ij] voltage angle differences between ith and jth bus, NB is the total number of buses.

Then, the equivalent conductance [G.sub.eq](V, f), the

susceptance [B.sub.eq](V, f) and the equivalent capacitance [C.sub.eq](V, f) of the modified simple equivalent circuit, shown in Fig.

The L-S admittance of the device is resolved into real and imaginary parts to obtain the L-S negative conductance (G(f)) and corresponding

susceptance (B(f)) as functions of frequency (since [Y.sub.D](f) = (G(f) + jB(f))[A.sub.j]; where [A.sub.j] is the effective junction area of the device considering circular cross-sectional area of the device, that is, [A.sub.j] = [pi][([D.sub.j]/2).sup.2]).