Advanced designs for non-imaging submillimeter-wave Winston cone concentrators

A. O. Nelson; E. N. Grossman

doi:10.1117/12.2050833

21 May 2014 Advanced designs for non-imaging submillimeter-wave Winston cone concentrators

A. O. Nelson, E. N. Grossman

Proceedings Volume 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense; 91020U (2014) https://doi.org/10.1117/12.2050833
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

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.

Citation Download Citation

A. O. Nelson and E. N. Grossman "Advanced designs for non-imaging submillimeter-wave Winston cone concentrators", Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 91020U (21 May 2014); https://doi.org/10.1117/12.2050833

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KEYWORDS

Waveguides

Throat

Solar concentrators

Prototyping

Power meters

Free space

Geometrical optics

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