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A precision SU8 micromachining technique has been developed for terahertz waveguide components.These circuits are formed by stacking several layers of silver-coated SU8 layers.These SU8 layers are defined by photolithography,and are designed to have the same layer thickness.This paper reviews several of these SU8 micromachined waveguide components operating at 300 GHz and 650 GHz.