Samantha M. Lewis, Emilio A. Nanni
We present results for the successful fabrication of low-loss THz metallic waveguide components using direct machining with a CNC end mill. The approach uses a split-block machining process with the addition of an RF choke running parallel to the waveguide. The choke greatly reduces coupling to the parasitic mode of the parallel-plate waveguide produced by the split-block. This method has demonstrated loss as low as 0.2 dB/cm at 280 GHz for a copper WR-3 waveguide. It has also been used in the fabrication of 3 and 10 dB directional couplers in brass, demonstrating excellent agreement with design simulations from 240–260 GHz. The method may be adapted to structures with features on the order of 200 m.
@article{e23f61b5-66c4-488d-ac2e-eae8ca548445,
title={Direct Machining of Low Loss THz Wavegui},
author={Samantha M. Lewis and Emilio A. Nanni},
year={2026},
language={en}
}TY - JOUR TI - Direct Machining of Low Loss THz Wavegui AU - Samantha M. Lewis AU - Emilio A. Nanni PY - 2026 LA - en ER -
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