We describe the design and simulation of several non-imaging concentrators designed to couple submillimeter
wavelength radiation from free space into highly overmoded, rectangular, WR-10 waveguide. Previous designs are
altered to improve the uniformity of efficiency rather than the efficiency itself. The concentrators are intended for use as
adapters between instruments using overmoded WR-10 waveguide as input or output and sources propagating through
free space. Previous simulation and measurement have shown that the angular response is primarily determined by the
Winston cone and is well predicted by geometric optics theory while the efficiencies are primarily determined by the
transition section. Additionally, previous work has shown insensitivity to polarization, orientation and beam size.
Several separate concentrator designs are studied, all of which use a Winston cone (also known as a compound parabolic
concentrator) with an input diameter ranging from 4 mm to 16 mm, and “throat” diameters of less than 0.5 mm to 4 mm
as the initial interface. The use of various length adiabatic circular-to-rectangular transition sections is investigated,
along with the effect of an additional, 25 mm waveguide section designed to model the internal waveguide of the power
meter. Adapters without a transition section and a rectangular Winston cone throat aperture and double cone
configurations are also studied. Adapters are analyzed in simulation for consistent efficiency across the opening aperture.
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