Novel full-band waveguide polar modulator for radio astronomy applications

A novel full-band (40% relative bandwidth) waveguide polar modulator (WPM) design based on a new architecture with two turnstile junctions and a nearly frequencyindependent differential 180° phase shift between orthogonal arms is presented. The use of suitably designed turnstile junctions together w...

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Autores: Hoyland, Roger J., Cano de Diego, Juan Luis|||0000-0002-7774-0758, Tribak, Abdelwahed, Mediavilla Sánchez, Ángel, Artal Latorre, Eduardo|||0000-0002-2569-1894
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/15609
Acceso en línea:http://hdl.handle.net/10902/15609
Access Level:acceso abierto
Palabra clave:Cryogenics
Polarimeter
Polarimetry
Radiometry
Turnstile junction
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spelling Novel full-band waveguide polar modulator for radio astronomy applicationsHoyland, Roger J.Cano de Diego, Juan Luis|||0000-0002-7774-0758Tribak, AbdelwahedMediavilla Sánchez, ÁngelArtal Latorre, Eduardo|||0000-0002-2569-1894CryogenicsPolarimeterPolarimetryRadiometryTurnstile junctionA novel full-band (40% relative bandwidth) waveguide polar modulator (WPM) design based on a new architecture with two turnstile junctions and a nearly frequencyindependent differential 180° phase shift between orthogonal arms is presented. The use of suitably designed turnstile junctions together with antiphase waveguide-coaxial-waveguide transitions in reduced-height waveguide technology enables the improvement of bandwidth over previous WPMs with a very compact and simple solution. This design enables continuous rotation about its central axis at 40 revolutions/s, which makes the modulator suitable for receivers with significant 1/f noise such as cryogenic radiometers. The polar modulator presented in this paper is designed to be cooled down to cryogenic temperatures in order to reduce its contribution to the receiver noise. This design is suitable for radio astronomy applications due to its costeffective, compact design, and high quality performance as well as being readily scalable. A polar modulator in the Ka-band (26.5-40 GHz) has been designed to show a reflection better than -20 dB, an insertion loss around 0.3 dB, and a cross-coupling near -35 dB measured at room temperature (T = 298 K). This insertion loss is reduced by 30%, while the phase difference and cross-coupling maintain similar values when the polar modulator is cooled to approximately T = 80 K.This work was supported by the Spanish Ministry of Economy and Competitiveness under the CONSOLIDERINGENIO 2010 program and project CSD2010-00064.Institute of Electrical and Electronics Engineers Inc.Universidad de Cantabria20182018-07-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/15609IEEE Transactions on Microwave Theory and Techniques, 2018, 66(7), 3253-3262reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/156092026-06-02T12:39:31Z
dc.title.none.fl_str_mv Novel full-band waveguide polar modulator for radio astronomy applications
title Novel full-band waveguide polar modulator for radio astronomy applications
spellingShingle Novel full-band waveguide polar modulator for radio astronomy applications
Hoyland, Roger J.
Cryogenics
Polarimeter
Polarimetry
Radiometry
Turnstile junction
title_short Novel full-band waveguide polar modulator for radio astronomy applications
title_full Novel full-band waveguide polar modulator for radio astronomy applications
title_fullStr Novel full-band waveguide polar modulator for radio astronomy applications
title_full_unstemmed Novel full-band waveguide polar modulator for radio astronomy applications
title_sort Novel full-band waveguide polar modulator for radio astronomy applications
dc.creator.none.fl_str_mv Hoyland, Roger J.
Cano de Diego, Juan Luis|||0000-0002-7774-0758
Tribak, Abdelwahed
Mediavilla Sánchez, Ángel
Artal Latorre, Eduardo|||0000-0002-2569-1894
author Hoyland, Roger J.
author_facet Hoyland, Roger J.
Cano de Diego, Juan Luis|||0000-0002-7774-0758
Tribak, Abdelwahed
Mediavilla Sánchez, Ángel
Artal Latorre, Eduardo|||0000-0002-2569-1894
author_role author
author2 Cano de Diego, Juan Luis|||0000-0002-7774-0758
Tribak, Abdelwahed
Mediavilla Sánchez, Ángel
Artal Latorre, Eduardo|||0000-0002-2569-1894
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Cryogenics
Polarimeter
Polarimetry
Radiometry
Turnstile junction
topic Cryogenics
Polarimeter
Polarimetry
Radiometry
Turnstile junction
description A novel full-band (40% relative bandwidth) waveguide polar modulator (WPM) design based on a new architecture with two turnstile junctions and a nearly frequencyindependent differential 180° phase shift between orthogonal arms is presented. The use of suitably designed turnstile junctions together with antiphase waveguide-coaxial-waveguide transitions in reduced-height waveguide technology enables the improvement of bandwidth over previous WPMs with a very compact and simple solution. This design enables continuous rotation about its central axis at 40 revolutions/s, which makes the modulator suitable for receivers with significant 1/f noise such as cryogenic radiometers. The polar modulator presented in this paper is designed to be cooled down to cryogenic temperatures in order to reduce its contribution to the receiver noise. This design is suitable for radio astronomy applications due to its costeffective, compact design, and high quality performance as well as being readily scalable. A polar modulator in the Ka-band (26.5-40 GHz) has been designed to show a reflection better than -20 dB, an insertion loss around 0.3 dB, and a cross-coupling near -35 dB measured at room temperature (T = 298 K). This insertion loss is reduced by 30%, while the phase difference and cross-coupling maintain similar values when the polar modulator is cooled to approximately T = 80 K.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-07-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/15609
url http://hdl.handle.net/10902/15609
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers Inc.
publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers Inc.
dc.source.none.fl_str_mv IEEE Transactions on Microwave Theory and Techniques, 2018, 66(7), 3253-3262
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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