Coplanar waveguides (CPWs) provide effective transmission with low dispersion into the millimeter-wave frequencies. For high-speed signaling, differential transmission lines display an enhanced immunity to outside interference and are less likely to interfere with other signals, when compared to single-ended transmission lines. Common-mode (CM) conversion from the differential-mode (DM) signal energy can produce unintentional radiation as well as degraded board-level electromagnetic compatibility (EMC) and signal integrity SI environments. Due to the negative effects of CM signals, filtering structures are often used to suppress the propagation of these signals. The filtering structures introduced in this project all implement the same CM filter design concept. While the concept itself is not new, the physical design of the filter combined with broadside differential CPWs had not been explored at the time of writing this thesis. The CM filtering structures described herein demonstrated to offer broadband CM filtering together with effective DM transmission into millimeter-wave frequencies
