Corrugated silicon platelet feed horn array for CMB polarimetry at 150 GHz
作者： Joe W. Britton , John P. Nibarger , Ki Won Yoon , James A. Beall , Dan Becker
DOI: 10.1117/12.857701
关键词:
摘要: Next generation cosmic microwave background (CMB) polarization anisotropy measurements will feature focal plane arrays with more than 600 millimeter-wave detectors. We make use of high-resolution photolithography and wafer-scale etch tools to build planar corrugated platelet feeds in silicon highly symmetric beams, low cross-polarization and side lobes. A compact Au-plated Si feed designed for 150 GHz operation exhibited performance equivalent that electroformed feeds: ~ -0.2 dB insertion loss, < -20 dB return loss from 120 GHz 170 GHz, -25 lobes -23 cross-polarization. are currently fabricating a 50mm diameter array 84 horns consisting 33 platelets as prototype the SPTpol and ACTpol telescopes. Our fabrication facilities permit up 150mm diameter.
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