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

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

2011-07-06

arxiv.org/abs/1107.1157v1

JINST 6 P06009 (2011)

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Scientific paper

10.1088/1748-0221/6/06/P06009

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.

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