Design of a Ku-Band High-Purity Transducer for the TM01 Circular Waveguide Mode by Means of T-Type Junctions
EntityUAM. Departamento de Tecnología Electrónica y de las Comunicaciones
PublisherInstitute of Electrical and Electronics Engineers
10.1109/ACCESS.2018.2885489J. R. Montejo-Garai, J. A. Ruiz-Cruz and J. M. Rebollar, "Design of a Ku-Band High-Purity Transducer for the TM01 Circular Waveguide Mode by Means of T-Type Junctions," in IEEE Access, vol. 7, pp. 450-456, 2019
Funded byThis work was supported by the Spanish Government (Agencia Estatal de Investigación) under Grant (ADDMATE) TEC2016-76070-C3-1/2-R (AEI/FEDER/UE)
ProjectGobierno de España. TEC2016-76070-C3-1/2-R
SubjectsWaveguide mode transducer; TM01 circular waveguide mode; field pattern symmetry; mode-conversion purity; overmoded waveguide; Telecomunicaciones
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A new mode transducer for converting the TE10 rectangular waveguide mode to the TM01 circular waveguide mode is presented. The novel topology is based on two T type junctions with in-phaseexcitation at their input rectangular ports. The first one is an H-plane T-junction in rectangular waveguide. The second one differs from the standard E-plane T-junction in the excitation, which is carried out by modes excited with fields having the same in-phase polarization at the input rectangular ports, and has the output port in circular waveguide. This configuration exploits the symmetry of the modes under consideration to achieve a high-purity conversion, controlling the propagating circular waveguide TE11 mode to a maximum level of -42 dB in the whole operation band. The design bandwidth is 2 GHz centered at 12 GHz with a return loss level higher than 28 dB. In addition, the transducer can be divided in a main body plus a cover for easing the manufacturing. In order to verify the proposed geometry, a back-to-back arrangement has been measured connecting two similar aluminum transducers with four different angles between their rectangular ports (0◦, 45◦, 90◦, and 180◦). The excellent experimental results validate the novel transducer with a measured converting efficiency higher than 98.2% in a 16.7% relative frequency bandwidth
Google Scholar:Montejo-Garai, José R. - Ruiz Cruz, Jorge Alfonso - Rebollar, Jesús M.
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