19 July 2016 Design of corrugated-horn-coupled MKID focal plane for CMB B-mode polarization
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Abstract
A focal plane based on MKID has been designed for cosmic microwave background (CMB) B-mode polarization experiments. We are designing and developing a focal plane with broadband corrugated horn array, planar OMT, 180 degree hybrid, bandpass filters, and MKIDs. The focal plane consists of 3 octave bands (55 - 108 GHz, 80 - 160 GHz, 160 - 320 GHz), 10 hexagonal modules. Broadband corrugated horn-array has been directly machined from an Al block and measured to have a good beam shape which is consistent with electromagnetic field simulations in octave bands. The horn array is designed to be low standing-wave, light weight, and electromagnetic shield. The broadband 4 probes ortho-mode transducer (OMT) is fabricated on Si membrane of an SOI wafer. A broadband 180 degree hybrid made with coplanar waveguide (CPW) is used to reduce higher modes of the circular waveguide. Two bandpass filters of each polarization are patterned with Nb microstrip. A prototype of the broadband corrugated horn coupled MKIDs has been fabricated and tested.
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Yutaro Sekimoto, Yutaro Sekimoto, Shigeyuki Sekiguchi, Shigeyuki Sekiguchi, Shibo Shu, Shibo Shu, Masakazu Sekine, Masakazu Sekine, Tom Nitta, Tom Nitta, Masato Naruse, Masato Naruse, Agnes Dominjon, Agnes Dominjon, Takashi Hasebe, Takashi Hasebe, Wenlei Shan, Wenlei Shan, Takashi Noguchi, Takashi Noguchi, Akihira Miyachi, Akihira Miyachi, Makoto Mita, Makoto Mita, Shigeo Kawasaki, Shigeo Kawasaki, } "Design of corrugated-horn-coupled MKID focal plane for CMB B-mode polarization", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99142A (19 July 2016); doi: 10.1117/12.2231074; https://doi.org/10.1117/12.2231074
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