Design of corrugated-horn-coupled MKID focal plane for CMB B-mode polarization
2016
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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