A MODEL OF COPLANAR WAVEGUIDE TYPE COUPLED EXPONENTIAL TRANSMISSION LINES ON SEMICONDUCTOR SUBSTRATES
A new coupled exponential transmission lines (CETL) on semiconductor substrate are designed using an efficient simple method which is the transmission line theory combined with the CETL equivalent circuit. For this an analytical model is given to determine the Sijparameters of the CETL versus frequency. The simulated results are compared to those of the coupled uniform transmission lines (CUTL). This comparison reveals that the use of an exponential shape of the lines and a semiconducting substrate contribute to obtaining a bandwidth of such coupler wider than that of the conventional ones formed by uniform transmission lines and dielectric substrates.
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