Wideband conductor loss calculation of planar quasi-TEM transmission lines with thin conductors using a phenomenological loss equivalence method

A phenomenological loss equivalence method is proposed to calculate the conductor losses of planar quasi-TEM (transverse electromagnetic) transmission lines over a wide frequency range. In this method the conductor losses can be readily calculated from a single strip equivalent to the original transmission lines. The calculated results for microstrip line are in good agreement over a broad bandwidth with those calculated using the finite-element method. Because of its simplicity, this method should be very useful for computer-aided design of monolithic microwave circuits. In addition, this method can also be applied to very thin and narrow superconductive lines using the complex conductivity based on the two-fluid model.<>