Compact wideband bowtie dipole orthomode transducer
Artikel i vetenskaplig tidskrift, 2019

A compact wideband orthomode transducer (OMT) with an octave bandwidth is proposed for a 0.56-1.12 GHz receiver system in the five hundred meter aperture spherical radio telescope. The OMT operates in a cryostat at a temperature of 70 K and therefore it is critical to minimize its dimension while insuring good electrical properties. The complete OMT comprises 2 bowtie dipoles orthogonally arranged in a circular waveguide. Because of the innovative structure, competing modes, TM01 TE21, and TE01, have been effectively suppressed, and the bandwidth of the dominate mode TE11 has achieved to 2.08:1. The final optimized OMT has a length of 300 mm, shorter than a half of the popular quardruple-ridged waveguide OMT. Measurements at room temperature agree well with simulation results, with a reflection coefficient below -10 dB for both polarizations and cross-coupling levels of -30.5 dB over the whole required frequency range.

FAST telescope

radio astronomy


orthomode transducers


Jin Fan

National Astronomical Observatory China

Kai Zhu

National Astronomical Observatory China

Jian Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Yihua Yan

National Astronomical Observatory China

Microwave and Optical Technology Letters

0895-2477 (ISSN) 1098-2760 (eISSN)

Vol. 61 4 883-885

Nyckelteknologi Utveckling för Ultrabredband Gruppantenn Radio Astronomisystem och undersökning av nya Begrepp för framtida millimeter och Terahertz radioteleskop

STINT (CH2015-6360), 2016-06-15 -- 2019-06-30.


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