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

Fan, Jin; Yan, Yihua; Jin, Chengjin; Zhan, Dezhi; Luo, Jirun

doi:10.2528/pierc17010802

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…Orthomode transducers (OMTs) are one of key components in both radio astronomy and telecommunication systems. Different OMT technologies were reported, such as the coupled waveguide, the planar, the finline, and the quardruple‐ridged waveguide (QRWG) OMTs. For radio astronomy applications, the OMTs with low cross‐polarization, low ohmic loss, and good impedance matching over a wide band are needed.…”

Section: Introductionmentioning

confidence: 99%

Compact wideband bowtie dipole orthomode transducer

Fan

Zhu

Yang

et al. 2019

Micro & Optical Tech Letters

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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.

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Section: Introductionmentioning

confidence: 99%

Compact wideband bowtie dipole orthomode transducer

Fan

Zhu

Yang

et al. 2019

Micro & Optical Tech Letters

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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%

“…But for the application of SKA band4 feed requiring coaxial ports, all the Bøifot‐based, double‐ridged waveguide and turnstile‐based OMTs need additional coaxial to rectangular waveguide transition, which will affect the performances and increase the physical size, so that the quad‐ridged OMT is a preferable solution. The quad‐ridged waveguide types normally achieve the widest bandwidth among all kinds of OMT …”

Section: Introductionmentioning

confidence: 99%

“…In Ref. , matching rings are introduced into two orthogonal probes to improve the impedance matching and isolation properties. With this design method, the proposed OMT has a bandwidth of 2:1 with excellent in‐band performance of 20 dB return loss, −45 dB cross‐coupling, and insertion loss below 0.15 dB, and the overall length is about 2.9 λ L .…”

Section: Introductionmentioning

confidence: 99%

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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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“…Several dual-band and multi-band OMTs in coupled waveguide, Fin line, planar and quad ridges waveguide configurations have been reported in the past [7][8][9][10][11][12]. The design of dual/multi-band OMTs is very complex as it should operate over wide band of frequencies, and port to port isolation should also be met.…”

Section: Introductionmentioning

confidence: 99%

Realization of Ku-Band Ortho Mode Transducer With High Port to Port Isolation

Verma¹,

Kumar²

2018

PIER Letters

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Abstract-Present paper describes the design, development and evaluation of a wideband, compact Ku-band orthomode transducer (OMT) for SATCOM application. It consists of a square waveguide output section, square waveguide to rectangular waveguide transition, straight waveguide port and an orthogonally coupled port. A tapered waveguide section has been used to couple the orthogonal RF (Radio Frequency) signal to the common port. The designed OMT has a transmit port with frequency band 13.75 GHz-14.5 GHz and a receive port with frequency band 10.95-12.5 GHz. Finite element method based ANSYS's High Frequency Structure Simulator (HFSS) EM software has been used for simulation and optimization of OMT. Measured reflection coefficients of OMT over transmission and reception frequency bands are better than −15 dB and −12 dB, respectively. Designed OMT has port to port isolation better than 45 dB against 30 dB isolation of conventional OMT available in market.

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

Cited by 9 publications

References 11 publications

Compact wideband bowtie dipole orthomode transducer

Compact wideband bowtie dipole orthomode transducer

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

Realization of Ku-Band Ortho Mode Transducer With High Port to Port Isolation

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