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10- to 19.5-GHz microwave receiver of an electro-optical interferometer for radio astronomy

Identificadores del recurso

2329-4221

2329-4124

ESP2015-70646-C2-2-R

http://hdl.handle.net/10902/17213

10.1117/1.JATIS.5.3.035007

Procedencia

(Repositorio Abierto de la Universidad de Cantabria)

Ficha

Título:: 10- to 19.5-GHz microwave receiver of an electro-optical interferometer for radio astronomy
Tema:: Interferometer; Cosmic microwave background; Stokes parameters; Radio astronomy; Polarimeter
Descripción:: This document describes the analysis, design, and prototype test results of the microwave section of a 10- to 19.5-GHz interferometer, aimed at obtaining polarization data of cosmic microwave background (CMB) radiation from the sky. First, receiver analysis is thoroughly assessed to study the contribution of each subsystem when obtaining the Stokes parameters of an input signal. Then, the receiver design is detailed starting from the front-end module, which works at cryogenic temperature, composed of a set of passive components: feedhorn, orthomode transducer, and polarizer, together with active components, such as very low-noise amplifiers. The back-end module (BEM) is directly connected, working at room temperature for further amplification, phase switching, and correlation of the signals. Moreover, the whole frequency band is split into two sub-bands (10 to 14 GHz and 16 to 20 GHz) using a high selective diplexer in the BEM in order to reject radiofrequency interferences. Phase switches allow phase difference steps of 5.625 deg, which modulate the correlated outputs to reduce systematic effects in the postdetection signal processing. Finally, measurements of all the subsystems comprising the microwave section of the receiver as well as the characterization of the complete microwave receiver are presented. The obtained results demonstrate successful performance of the microwave receiver that, together with an electro-optical correlator and a near-infrared camera, comprises the interferometer. Moreover, synthesized images corresponding to combinations of the Stokes parameters can be obtained with the whole system.; The authors would like to thank the Spanish Ministry of Economy, Industry, and Competitiveness for financial support provided through the grant ESP2015-70646-C2-2-R. The authors thank Eva Cuerno for her assistance during the assembly of the circuits.
Fuente:: Journal of Astronomical Telescopes, Instruments, and Systems, 2019, 5(3), 035007
Idioma:: English
Relación:: https://doi.org/10.1117/1.JATIS.5.3.035007
Autor/Productor:: Aja Abelán, Beatriz; Fuente Rodríguez, Luisa María de la; Artal Latorre, Eduardo; Villa Benito, Enrique; Cano de Diego, Juan Luis; Mediavilla Sánchez, Ángel
Editor:: SPIE
Otros colaboradores/productores:: Universidad de Cantabria
Derechos:: © 2019 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.; http://creativecommons.org/licenses/by/4.0/; openAccess
Fecha:: 2019-11-08T08:46:40Z; 2019-08-16
Tipo de recurso:: info:eu-repo/semantics/article; publishedVersion

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2. <dc:creator>Aja Abelán, Beatriz</dc:creator>
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8. <dc:contributor>Universidad de Cantabria</dc:contributor>
9. <dc:subject>Interferometer</dc:subject>
10. <dc:subject>Cosmic microwave background</dc:subject>
11. <dc:subject>Stokes parameters</dc:subject>
12. <dc:subject>Radio astronomy</dc:subject>
13. <dc:subject>Polarimeter</dc:subject>
14. <dc:description>This document describes the analysis, design, and prototype test results of the microwave section of a 10- to 19.5-GHz interferometer, aimed at obtaining polarization data of cosmic microwave background (CMB) radiation from the sky. First, receiver analysis is thoroughly assessed to study the contribution of each subsystem when obtaining the Stokes parameters of an input signal. Then, the receiver design is detailed starting from the front-end module, which works at cryogenic temperature, composed of a set of passive components: feedhorn, orthomode transducer, and polarizer, together with active components, such as very low-noise amplifiers. The back-end module (BEM) is directly connected, working at room temperature for further amplification, phase switching, and correlation of the signals. Moreover, the whole frequency band is split into two sub-bands (10 to 14 GHz and 16 to 20 GHz) using a high selective diplexer in the BEM in order to reject radiofrequency interferences. Phase switches allow phase difference steps of 5.625 deg, which modulate the correlated outputs to reduce systematic effects in the postdetection signal processing. Finally, measurements of all the subsystems comprising the microwave section of the receiver as well as the characterization of the complete microwave receiver are presented. The obtained results demonstrate successful performance of the microwave receiver that, together with an electro-optical correlator and a near-infrared camera, comprises the interferometer. Moreover, synthesized images corresponding to combinations of the Stokes parameters can be obtained with the whole system.</dc:description>
15. <dc:description>The authors would like to thank the Spanish Ministry of Economy, Industry, and Competitiveness for financial support provided through the grant ESP2015-70646-C2-2-R. The authors thank Eva Cuerno for her assistance during the assembly of the circuits.</dc:description>
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