Full-wave modeling and optimization of Bøifot junction ortho-mode transducers

Ruiz‐Cruz, Jorge A.; Montejo‐Garai, José R.; Rebollar, J.M.

doi:10.1002/mmce.20287

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…However, the presence of a higher order mode TM 01 often limits the OMT bandwidth. 3 The symmetric structure [4][5][6][7][8][9][10] is an effective method to obtain the wideband solutions (>70%). Although these wide band designs can achieve high performance by avoiding the excitation of higher order modes, they must be implemented with complex and bulky structure due to the requirement of utilizing 2-fold symmetries.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐compact taper branching orthomode transducer

Fan

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

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This article proposes an ultra‐compact orthomode transducer (OMT) with novel taper branching structure. By combing the taper section and split part, the overall OMT can be implemented in a monoblock, which is as small as waveguide flanges. Furthermore, the good matching effect achieved by ridge and split makes the OMT maintaining the most compact structure with high performance. The whole structure can be fabricated using the conventional computer numerical control milling technique. A K‐band OMT is designed and tested. The measured results compared with the simulated results validated the proposed design.

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Section: Introductionmentioning

confidence: 99%

Ultra‐compact taper branching orthomode transducer

Fan

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

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“…The physical symmetry of the OMT structure determines the amount of excited higher‐order modes and restricts the maximum theoretical bandwidth of operation . For the radio astronomy application, wideband OMTs are needed, several types of which have been presented in previous works well suited for wideband specifications …”

Section: Introductionmentioning

confidence: 99%

“…The most popular types are Bøifot junction OMT, double‐ridged waveguide OMT, turnstile junction OMT, and quad‐ridged waveguide OMT. The Bøifot‐based OMTs can be found in References . To obtain wideband characteristics, an OMT based on Bøifot junction with capacitive posts is proposed covering a 54% bandwidth, which is the widest bandwidth in the Bøifot junction‐type OMT, but the OMT is used for the X/Ku dual bands, a discrete band .…”

Section: Introductionmentioning

confidence: 99%

Wideband orthomode transducer for the Square Kilometre Array band4 single pixel feed

Wang

Yang

2019

Int J RF Microw Comput Aided Eng

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The design of a compact wideband orthomode transducer (OMT) for band4 single pixel feed of the Square Kilometre Array (SKA) dish is presented. The geometry of the proposed OMT is based on circular quad-ridged waveguide to obtain wideband characteristics, which consists of a coaxial to quad-ridged waveguide transition and a circular to quad-ridged waveguide tapered transition. By adopting circular quadridged waveguide and high-order cosine taper for the ridges, the length of OMT is compact and the levels of higher-order modes generated at the circular waveguide aperture are lower. To verify the OMT performance, a prototype is manufactured and tested using a vector network analyzer. The measured results agree very well with the calculated ones across the frequency range 2.8-5.18 GHz. The tested reflection coefficients are less than -19 dB, the insertion losses are less than 0.25 dB for both polarization channels, and the isolation between two output ports is better than 37.7 dB. It is confirmed that the designed OMT can be satisfied with the requirement of the SKA band4 feed system. K E Y W O R D Sorthomode transducer, quad-ridged waveguide, Square Kilometre Array, wide band

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“…Diplexers will follow for further frequency discrimination. The configuration limitation makes turnstile‐based OMTs the most appropriate candidates, without regards for other wideband designs such as those based on Bøifot junctions or quadruple ridges . The symmetrical structures can suppress higher order modes excitation, contributing to wider operating bandwidth, better cross‐polarization discrimination, and identical orthogonal polarization channels.…”

Section: Introductionmentioning

confidence: 99%

Wideband turnstile junction coaxial waveguide orthomode transducer

Peng-Yu

Qiu

2017

Int J. RF Microw. Comput. Aided Eng.

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A wideband turnstile junction coaxial waveguide orthomode transducer (OMT) is presented in this paper, featuring coaxial waveguide input and orthogonal rectangular waveguide outputs. It primarily comprises of a turnstile junction, bending stepped impedance transformers and power combiners. The symmetrical geometry helps achieve wide operating bandwidth and balanced output phases. The OMT covers the whole Ku band from 12 to 18 GHz, which aims at wideband dual‐polarized signal combination and separation within coaxial‐type multi‐band antenna systems. An experimental prototype is manufactured and the measured results confirm that the reflection coefficient is lower than −15 dB within the whole band, and the port isolation is better than 35 dB. Turnstile junction coaxial waveguide OMTs can be adopted widely in circular/coaxial waveguide hybrid feeding networks for multi‐band satellite communication/remote sensing antenna systems.

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Full-wave modeling and optimization of Bøifot junction ortho-mode transducers

Cited by 11 publications

References 17 publications

Ultra‐compact taper branching orthomode transducer

Ultra‐compact taper branching orthomode transducer

Wideband orthomode transducer for the Square Kilometre Array band4 single pixel feed

Wideband turnstile junction coaxial waveguide orthomode transducer

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