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

Abstract

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.

References in corpus (4)

• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Calibrator Design for the COBE Far Infrared Absolute Spectrophotometer (FIRAS)
• A CMB Polarization Primer
• Status of CMB Polarization Measurements from DASI and Other Experiments

Cited by in corpus (4)

• The large scale polarization explorer (LSPE) for CMB measurements: performance forecast
• QUBIC: the Q & U Bolometric Interferometer for Cosmology
• The STRIP instrument of the Large Scale Polarization Explorer: microwave eyes to map the Galactic polarized foregrounds
• QUBIC VII: The feedhorn-switch system of the technological demonstrator