We present the design, manufacturing, and testing of a 37-element array of corrugated feedhorns for Cosmic Microwave Background (CMB) measurements between 140 and 170 GHz. The array was designed to be coupled to Kinetic Inductance Detector arrays, either directly (for total power measurements) or through an orthomode transducer (for polarization measurements). We manufactured the array in platelets by chemically etching aluminum plates of 0.3 mm and 0.4 mm thickness. The process is fast, low-cost, scalable, and yields high-performance antennas compared to other techniques in the same frequency range. Room temperature electromagnetic measurements show excellent repeatability with an average cross polarization level about −20 dB, return loss about −25 dB, first sidelobes below −25 dB and far sidelobes below −35 dB. Our results qualify this process as a valid candidate for state-of-the-art CMB experiments, where large detector arrays with high sensitivity and polarization purity are of paramount importance in the quest for the discovery of CMB polarization B-modes.

A chemically etched corrugated feedhorn array for D-band CMB observations / S. Mandelli, E. Manzan, A. Mennella, F. Cavaliere, V. Daniele, C. Franceschet, P. de Bernardis, M.R.F. Bersanelli, M. Gabriella Castellano, A. Coppolecchia, A. Cruciani, M. Gervasi, L. Lamagna, A. Limonta, S. Masi, A. Paiella, A. Passerini, G. Pettinari, F. Piacentini, E. Tommasi, A. Volpe, M. Zannoni. - In: EXPERIMENTAL ASTRONOMY. - ISSN 1572-9508. - 51:2(2021 Apr), pp. 249-272. [10.1007/s10686-021-09698-9]

A chemically etched corrugated feedhorn array for D-band CMB observations

S. Mandelli
Primo
;
A. Mennella;F. Cavaliere;V. Daniele;C. Franceschet;M.R.F. Bersanelli;
2021-04

Abstract

We present the design, manufacturing, and testing of a 37-element array of corrugated feedhorns for Cosmic Microwave Background (CMB) measurements between 140 and 170 GHz. The array was designed to be coupled to Kinetic Inductance Detector arrays, either directly (for total power measurements) or through an orthomode transducer (for polarization measurements). We manufactured the array in platelets by chemically etching aluminum plates of 0.3 mm and 0.4 mm thickness. The process is fast, low-cost, scalable, and yields high-performance antennas compared to other techniques in the same frequency range. Room temperature electromagnetic measurements show excellent repeatability with an average cross polarization level about −20 dB, return loss about −25 dB, first sidelobes below −25 dB and far sidelobes below −35 dB. Our results qualify this process as a valid candidate for state-of-the-art CMB experiments, where large detector arrays with high sensitivity and polarization purity are of paramount importance in the quest for the discovery of CMB polarization B-modes.
Corrugated feedhorn antennas; CMB polarization; B-modes; Platelet manufacturing; Chemical etching
Settore FIS/05 - Astronomia e Astrofisica
12-feb-2021
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/815128
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