Calculation of Transmission Characteristics in Microstrip and Coplanar Lines Using Copper-Clad Glass Cloth Dielectric Laminate Substrates

For 50-ohm microstrip and coplanar lines constructed on a copper-clad ceramic/PTFE glass cloth laminate substrate AR-1000, the propagation constants gamma=alpha+jszlig, where alpha is attenuation constant and beta is phase constant, are calculated with the 3-dimensional electromagnetic simulator HFSS and 2.5-dimensional simulator Sonnet em in the frequency range 1 to 20 GHz. Particularly, the attenuation constant due to the conductor loss alpha_c and one due to the dielectric loss alpha_d are evaluated separately from calculations. The results calculated for accurate measured values of relative permittivity in the normal and tangential directions for the AR1000 substrate and of surface and interface resistances of copper foils plated on the both sides, are compared with ones for the nominal values presented by a manufacturer.