Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10071/16648 |
Resumo: | Transmit arrays have been mostly used for beam collimation applications, either with fixed or scanning beam capability. But transmit arrays can also be used to synthesize power radiation patterns complying with power pattern templates. A new analytical formulation is presented here to obtain a phase-only correction function corresponding to a given power template. The transmit-array transforms the known power radiation pattern of the primary source into a desired output power pattern. The proposed formulation, specialized for axial-symmetric structures, is based on geometrical optics and provides the solution directly from the evaluation of two closed-form first-order differential equations. As a proof of concept, a sec 2 with a roll-off at 45° is defined as the target power pattern, at the 30 GHz Ka-band. A 10.8 dBi radiation pattern with the circular polarization is used to illuminate a 180 mm ×180 mm transmit array with 60 mm focal distance. Previously designed 3.35 mm thick phase-delay unit cells are used as an example to implement the calculated phase distribution over the transmit-array aperture. The measured antenna radiation pattern matches quite well the template, with a steep fall of the radiation at the roll-off angle and low cross-polarization. This validates the concept, the formulation, and the fabricated prototype. |
id |
RCAP_f8c9de1f4f8071414583963dee2bb422 |
---|---|
oai_identifier_str |
oai:repositorio.iscte-iul.pt:10071/16648 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arraysGeometrical optics (GO)Millimeter-wave antennasPlanar lens antennasRadiation pattern shapingSecant squared power patternTransmit arraysTransmit arrays have been mostly used for beam collimation applications, either with fixed or scanning beam capability. But transmit arrays can also be used to synthesize power radiation patterns complying with power pattern templates. A new analytical formulation is presented here to obtain a phase-only correction function corresponding to a given power template. The transmit-array transforms the known power radiation pattern of the primary source into a desired output power pattern. The proposed formulation, specialized for axial-symmetric structures, is based on geometrical optics and provides the solution directly from the evaluation of two closed-form first-order differential equations. As a proof of concept, a sec 2 with a roll-off at 45° is defined as the target power pattern, at the 30 GHz Ka-band. A 10.8 dBi radiation pattern with the circular polarization is used to illuminate a 180 mm ×180 mm transmit array with 60 mm focal distance. Previously designed 3.35 mm thick phase-delay unit cells are used as an example to implement the calculated phase distribution over the transmit-array aperture. The measured antenna radiation pattern matches quite well the template, with a steep fall of the radiation at the roll-off angle and low cross-polarization. This validates the concept, the formulation, and the fabricated prototype.IEEE - Institute of electrical electronics and engineers2018-10-12T10:50:51Z2018-01-01T00:00:00Z20182019-03-08T17:56:42Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10071/16648eng0018-926X10.1109/TAP.2018.2836383Cruz, C. C.Fernandes, C. A.Matos, S. A.Costa, J. R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-09T17:55:54Zoai:repositorio.iscte-iul.pt:10071/16648Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:28:35.266372Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
title |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
spellingShingle |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays Cruz, C. C. Geometrical optics (GO) Millimeter-wave antennas Planar lens antennas Radiation pattern shaping Secant squared power pattern Transmit arrays |
title_short |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
title_full |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
title_fullStr |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
title_full_unstemmed |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
title_sort |
Synthesis of shaped-beam radiation patterns at millimeter-waves using transmit arrays |
author |
Cruz, C. C. |
author_facet |
Cruz, C. C. Fernandes, C. A. Matos, S. A. Costa, J. R. |
author_role |
author |
author2 |
Fernandes, C. A. Matos, S. A. Costa, J. R. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Cruz, C. C. Fernandes, C. A. Matos, S. A. Costa, J. R. |
dc.subject.por.fl_str_mv |
Geometrical optics (GO) Millimeter-wave antennas Planar lens antennas Radiation pattern shaping Secant squared power pattern Transmit arrays |
topic |
Geometrical optics (GO) Millimeter-wave antennas Planar lens antennas Radiation pattern shaping Secant squared power pattern Transmit arrays |
description |
Transmit arrays have been mostly used for beam collimation applications, either with fixed or scanning beam capability. But transmit arrays can also be used to synthesize power radiation patterns complying with power pattern templates. A new analytical formulation is presented here to obtain a phase-only correction function corresponding to a given power template. The transmit-array transforms the known power radiation pattern of the primary source into a desired output power pattern. The proposed formulation, specialized for axial-symmetric structures, is based on geometrical optics and provides the solution directly from the evaluation of two closed-form first-order differential equations. As a proof of concept, a sec 2 with a roll-off at 45° is defined as the target power pattern, at the 30 GHz Ka-band. A 10.8 dBi radiation pattern with the circular polarization is used to illuminate a 180 mm ×180 mm transmit array with 60 mm focal distance. Previously designed 3.35 mm thick phase-delay unit cells are used as an example to implement the calculated phase distribution over the transmit-array aperture. The measured antenna radiation pattern matches quite well the template, with a steep fall of the radiation at the roll-off angle and low cross-polarization. This validates the concept, the formulation, and the fabricated prototype. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-10-12T10:50:51Z 2018-01-01T00:00:00Z 2018 2019-03-08T17:56:42Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10071/16648 |
url |
http://hdl.handle.net/10071/16648 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0018-926X 10.1109/TAP.2018.2836383 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IEEE - Institute of electrical electronics and engineers |
publisher.none.fl_str_mv |
IEEE - Institute of electrical electronics and engineers |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799134848054460416 |