Wide-band orthomode transducers

Skinner, S.J.; James, G.L.

doi:10.1109/22.102973

Cited by 101 publications

(59 citation statements)

References 4 publications

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“…The OMT adopts a circular quad-ridged waveguide and is fed by two coaxial lines through the ridges, with the inner conductors connected to the corresponding opposite ridges, similar to the structures in [4][5][6][7][8]. However, a cylindrical circular waveguide rather than a tapered circular or a square waveguide is adopted, thus the complexity of manufacture can be reduced.…”

Section: The Structure Of the Omtmentioning

confidence: 99%

“…The quad-ridged waveguide OMT was studied in [4], and a wide bandwidth close to 2.2 : 1 can be achieved with a return loss less than −15 dB, but cross-polarization isolation was limited to 25 dB or less [6]. Some improved designs for the quad-ridged waveguide OMT were proposed in order to improve the return loss and isolation performances [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The basic concept of finline OMT was discussed by Robertson [3] in 1956, in which the impedance matching was improved with a return loss less than −15 dB over the bandwidth of 1.7 : 1; however the asymmetric structure made the maximum relative cross-polar level exceed −20 dB, which limits the application of the finline OMT [4]. In [5], a compact planar OMT was presented with a cross-polarization at a level below −58 dB as well as a return loss less than −20 dB over a 1.5 : 1 bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…With the development of broadband corrugated feed horns, the design of wideband orthomode transducers is demanded. Several different broadband OMT types have been presented in previous works, including the coupled waveguide [1,2], finline [3,4], planar [5], and quad-ridged waveguide types [4,[6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Design of Wideband Quad-Ridged Waveguide Orthomode Transducer at L-Band

Fan¹,

Yan²,

Jin³

et al. 2017

PIER C

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Abstract-In this paper, an L-band wideband quad-ridged waveguide orthomode transducer (OMT) for the Five hundred meter Aperture Spherical radio Telescope (FAST) is presented with a simple design principle. By designing two critical parts of the OMT separately and introducing matching rings into two orthogonal probes, an improved wideband performance has been realized successfully. The OMT is designed to operate across the 0.95 GHz-1.9 GHz band, and the simulation shows a return loss better than −20 dB for both polarizations, cross-polarized isolation levels over 45 dB and insertion loss lower than 0.15 dB over the entire bandwidth. The measured results are in good agreement with the simulations.

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Section: The Structure Of the Omtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Wideband Quad-Ridged Waveguide Orthomode Transducer at L-Band

Fan¹,

Yan²,

Jin³

et al. 2017

PIER C

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“…ransitions from coaxial to quad ridge waveguide are often used in radio astronomy applications and can achieve very low return loss, dual polarization and wide bandwidths [1]. These transitions are typically followed by a corrugated horn antenna to obtain rotationally symmetric radiation patterns that remain fairly constant over the frequency band of the horn antenna.…”

Section: Introductionmentioning

confidence: 99%

Elliptically Shaped Quad-Ridge Horn Antennas as Feed for a Reflector

Jacobs

Odendaal

Joubert

2011

Antennas Wirel. Propag. Lett.

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Abstract-Quad ridge horn antennas of various geometries are considered as possible candidates for a wideband reflector antenna feed. It is demonstrated that shaping the sidewalls of the ridge horns significantly improves the radiation characteristics of the horns. The conical quad ridge horn with an elliptically shaped sidewall shows the most promise as a wideband reflector antenna feed. The radiation patterns are rotationally symmetric and the 10 dB beamwidth is reasonably constant over a wide frequency range.Index Terms-Radio astronomy, horn antenna, reflector antenna, wideband, dual polarization.

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Orthomode Transducers

Gentili

Nesti

Pelosi

et al. 2005

Encyclopedia of RF and Microwave Engineering

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In the present work orthomode transducers (OMTs) and polarizers are presented. First, field configurations and propagation properties in common waveguides, which are extensively used in OMTs and polarizers, are analyzed to provide the reader with the necessary background to understand both OMTs and polarizers. As a second step, some OMT and polarizer devices are described in attempt to highlight their electromagnetic features; this is not intended as a full review of all the known OMT and polarizer configurations, which is beyond the scope of this work, but to provide the reader with a basic knowledge of the principles of their operation. This is done by choosing a small, but representative, set of configurations largely used in practice that analyzed in depth and whose understanding, in the author's opinion, gives the reader a broad knowledge of the argument. Finally, two example designs are presented, the first related to an OMT and the second to a polarizer.

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Wide-band orthomode transducers

Cited by 101 publications

References 4 publications

Design of Wideband Quad-Ridged Waveguide Orthomode Transducer at L-Band

Design of Wideband Quad-Ridged Waveguide Orthomode Transducer at L-Band

Elliptically Shaped Quad-Ridge Horn Antennas as Feed for a Reflector

Orthomode Transducers

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