Investigation of characteristic impedances of the broadside-coupled coplanar waveguide at microwave and millimeter-wave frequencies
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Dynamic characteristic impedances of the broadside-coupled coplanar waveguide (CPW) are calculated using the spectral-domain approach. It is found that variation of the mode characteristics impedances can be substantial over the dominant-mode frequency range, indicating the need for dynamic characteristic impedances for accurate designs of broadside-coupled CPW circuits at high frequencies.