Dispersion characteristics of the broadside-coupled coplanar waveguide
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The dispersive properties for the even-and odd- modes of the broadside-coupled coplanar waveguide (CPW) are determined using the spectral domain method. Various numerical results of the even- and odd-mode effective dielectric constants as a function of frequency are presented and discussed. It is found that the structure has a very weak dispersion. This fact is further confirmed through a comparison between the calculated dynamic and quasistatic results of the even- and odd-mode effective dielectric constants. The low dispersion feature signifies the fact that the quasistatic analysis is adequate for designing practical microwave and millimeter-wave circuits employing broadside-coupled CPW. 1993 IEEE