W-band prototype of platelet feed-horn array for CMB polarisation measurements

We present the design and performance of a 2x2 prototype array of corrugated feed-horns in W-band. The module is fabricated using a so-called "platelet" technique by milling Aluminum plates. This technique is suitable for low-cost and scalable high performance applications. Room temperatur...

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Published inarXiv.org
Main Authors Francesco Del Torto, Bersanelli, Marco, Cavaliere, Francesco, De Rosa, Adriano, D'Arcangelo, Ocleto, Franceschet, Cristian, Gervasi, Massimo, Mennella, Aniello, Pagana, Enrico, Simonetto, Alessandro, Tartari, Andrea, Villa, Fabrizio, Zannoni, Mario
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.07.2011
Subjects
Aluminum
Arrays
Big Bang theory
Cosmic microwave background
Horns
Physics - Cosmology and Nongalactic Astrophysics
Physics - Instrumentation and Methods for Astrophysics
Polarization
Sidelobes
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Summary:We present the design and performance of a 2x2 prototype array of corrugated feed-horns in W-band. The module is fabricated using a so-called "platelet" technique by milling Aluminum plates. This technique is suitable for low-cost and scalable high performance applications. Room temperature Return Loss measurements show a low (<-30 dB) reflection over a 30% bandwidth with a maximum matching of -42 dB at 100 GHz for all four antennas. Beam pattern measurements indicate good repeatability and a low (-25 dB) sidelobe and crosspolarisation levels. This work is particularly relevant for future Cosmic Microwave Background polarisation measurements, which require large microwave cryogenic detector arrays coupled to high performance corrugated feed horns.
ISSN:2331-8422
DOI:10.48550/arxiv.1107.1157