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Ferreira IS, Tello C, Bergano M, et al. A C-band broadband ortho-mode transducer for radioastronomy polarimetry. Springerplus. 2016;5(1):2069doi: 10.1186/s40064-016-3761-5.
Ferreira, I. S., Tello, C., Bergano, M., Villela, T., Barbosa, D., & Smoot, G. F. (2016). A C-band broadband ortho-mode transducer for radioastronomy polarimetry. SpringerPlus, 5(1), 2069. https://doi.org/10.1186/s40064-016-3761-5
Ferreira, Ivan S, et al. "A C-band broadband ortho-mode transducer for radioastronomy polarimetry." SpringerPlus vol. 5,1 (2016): 2069. doi: https://doi.org/10.1186/s40064-016-3761-5
Ferreira IS, Tello C, Bergano M, Villela T, Barbosa D, Smoot GF. A C-band broadband ortho-mode transducer for radioastronomy polarimetry. Springerplus. 2016 Dec 02;5(1):2069. doi: 10.1186/s40064-016-3761-5. eCollection 2016. PMID: 27995046; PMCID: PMC5135708.
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Springerplus. 2016 Dec 02;5(1):2069. doi: 10.1186/s40064-016-3761-5. eCollection 2016.

A C-band broadband ortho-mode transducer for radioastronomy polarimetry.

SpringerPlus

Ivan S Ferreira, Camilo Tello, Miguel Bergano, Thyrso Villela, Domingos Barbosa, George F Smoot

Affiliations

  1. Laboratório de Cosmologia e Astrofísica, Instituto de Física, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Asa Norte, Brasília, 70919-970 Brazil.
  2. Divisão de Astrofísica - DAS, Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1.758, Jd. Granja, São José dos Campos, SP CEP 12227-010 Brazil.
  3. Wiseware Engineered Solutions, Zona Industrial da Mota, Rua 12, Lote 51, Fração E, 3830-527 Gafanha da Encarnação, Portugal.
  4. ENGAGE SKA, Instituto de Telecomunicações, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
  5. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 50-5005, Berkeley, CA 94720 USA ; Université Paris-Diderot APC, Bâtiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.

PMID: 27995046 PMCID: PMC5135708 DOI: 10.1186/s40064-016-3761-5

Abstract

BACKGROUND: We describe the design, the construction and performance of a narrow band ortho-mode transducer, currently used in the 5 GHz polarimetric receiver of the Galactic Emission Mapping project.

RESULTS: The ortho-mode transducer was designed to achieve a high degree of transmission within the 400 MHz of the GEM band around the 5 GHz (4.8-5.2 GHz). It is composed of a circular-to-square waveguide transition, a septum polarizer, a thin waveguide coupler and a smooth square-to-rectangular waveguide transition with custom waveguide bends to the output ports.

CONCLUSION: Our simulations and measurements show a very low level of cross-polarization of about -60 dB and a good impedance match for all three ports (S11; S22; S33 < -30 dB) with only 0:25 dB of insertion loss offset across the 400 MHz (4.8-5.2 GHz) of the reception bandwidth.

Keywords: Ortho-mode transducers; Polarimeters; Radioastronomy

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