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.
@article{arxiv.1107.1157,
title = {W-band prototype of platelet feed-horn array for CMB polarisation measurements},
author = {Francesco Del Torto and Marco Bersanelli and Francesco Cavaliere and Adriano De Rosa and Ocleto D'Arcangelo and Cristian Franceschet and Massimo Gervasi and Aniello Mennella and Enrico Pagana and Alessandro Simonetto and Andrea Tartari and Fabrizio Villa and Mario Zannoni},
journal= {arXiv preprint arXiv:1107.1157},
year = {2011}
}