The shielded transmission line is considered. The line consists of 2 copper strip-like conductors (block labels - Elec1 and Elec 2) that are rested on the polyethylene substrate (Diel). The whole structure, that includes partly an air, is protected by a screen (Shield) of the complicated geometry.
Attenuation constant of the shielded microstrip-like transmission line is obtained on the basis of the electrostatics and time-frequency analysis.
Voltage distribution in transmission line:
See detailed description in Attenuation constant of the shielded microstrip-like transmission line (in PDF format).