Abstract

A 3D printed quasi-ideal grounded coplanar waveguide (QI-GCPW) transmission line is presented. The QIGCPW is made of a continuous metal wall and is compared against multiple GCPWs with traditional grounding vias spaced at different intervals. The QI-GCPW extends the usable frequency range of the transmission line by increasing the cutoff frequency of the dominant mode in the GCPW structure. Simulated and measured results show that a QI-GCPW can extend the cutoff frequency of a transmission line from $\sim 12 GHz$ with a worst-case via spacing to >65 GHz with the QI-GCPW.

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