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A closed-form analysis of infinitely parallel coplanar waveguides

This paper presents an analytical formula for quasi-static evaluation of even- and odd-mode characteristics of infinitely parallel coplanar waveguides. The analysis yields closed-form expressions based on the conformal mapping method and partial capacitance technique with quasi-TEM assumption. Calculated results show that both the even- and odd-mode characteristic impedances are in good agreements with the results generated by numerical solvers and available experimental data. The results are important especially for integrated circuit designs where unnecessary crosstalk between signal conductors could be a severe problem.