Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 193, Issue 5-6, Pages 777-785Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-018-1923-2
Keywords
Spectroscopy; Magnetically coupled antenna; Broadband absorber
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Funding
- National Aeronautics and Space Administration (NASA) Astronomy and Physics Research and Analysis (APRA) grant [NNH14ZDA001N-APRA]
- Goddard Space Flight Center (GSFC) Internal Research and Development program
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D The design of a two-dimensional spatial beam-combining network employing a parallel-plate superconducting waveguide filled with a monocrystalline silicon dielectric substrate is presented. This component uses arrays of magnetically coupled antenna elements to achieve high coupling efficiency and full sampling of the intensity distribution while avoiding diffractive losses in the multimode waveguide region. These attributes enable the structure's use in realizing compact far-infrared spectrometers for astrophysical and instrumentation applications. If unterminated, reflections within a finite-sized spatial beam combiner can potentially lead to spurious couplings between elements. A planar meta-material electromagnetic absorber is implemented to control this response within the device. This broadband termination absorbs greater than 0.99 of the power over the 1.7:1 operational band at angles ranging from normal to near-parallel incidence. The design approach, simulations and applications of the spatial power combiner and meta-material termination structure are presented.
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