Surface-impedance quasi-transverse electromagnetic approach for the efficient calculation of conductor losses in multilayer single and coupled microstrip lines

Calculating Radar Cross Section of Lossy Targets Using the Surface Impedance Approach

“…To circumvent these constraints, Marqués et al have proposed an alternative approximated method making use of the surface impedance concept [20,21]. Recently, this concept has been improved in [15,16] by making use of a new calculation strategy.…”

“…The surface impedance provides the boundary condition for fields outside the conductor and accounts for the dissipation and energy stored inside the conductor. The main idea of the surface impedance approach in the study of microstrip lines with rectangular cross section, as presented in [15,20], is to replace the thick conducting strip with a zero-thickness sheet that carries an equivalent surface current density, J s . The main advantage of this technique is to avoid the solution of a wave equation for the potential vector inside the thick strip (Eq.…”

“…One of those methods is the technique proposed by [20], which has been improved recently in [15,16]. The main advantage of this technique is that it can be combined with a quasi-TEM approach to form the so-called quasi-TEM surface impedance approach.…”

“…Thus, for the calculation of the ratio H + x /H − x we follow the method proposed in [15]. This strategy results in a direct semi-numerical calculation and a faster CPU time.…”

“…If the source illuminating the target is at a far enough distance, then the incident field can be taken as a plane wave. The surface impedance technique used in this study has been developed in [15] for the calculation of conductor loss of single and two coupled rectangular microstrip lines. The accuracy of this technique has been improved recently in [16] for three, four and five coupled conducting strips embedded in a lossless dielectric medium.…”