A dielectric rod waveguide in dual-polarized operation is characterized experimentally in the 60 GHz band. The cross-sectional shape of the extruded PTFE rod is chosen to reduce both transmission loss and unwanted coupling to the orthogonal polarization mode. Measurements include the effects of radiation leakage at bends and the cross-coupling due to twists. Measured insertion loss is 2.05 dB/m and 2.27 dB/m at 60 GHz for the two polarizations, respectively. This is based on an extracted material loss tangent of 0.000'4 at 60 GHz.
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Li et al. (2024) studied this question.
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