Fullwave description of propagation and losses in quasiplanar transmission lines by quasi-analytical solution

The authors present a full-wave description of propagation and losses for some quasi-planar transmission lines using a quasi-analytical solution. The latter is derived from a modified transverse resonance method (MTRM), in which analytical preprocessing has been introduced. The quasi-static contribution is obtained by an entirely analytical solution, making the resultant system of linear equations very efficient. The resistive boundary conditions and the complex substrate permittivity are taken into account in an intrinsic manner, leading to an accurate determination of dielectric and conductor losses in lossy transmission lines. Theoretical and experimental results are presented for a lossless coplanar waveguide and a lossy microstrip line, respectively.<>