A microwave measurement procedure for a full characterization of ortho-mode transducers

Peverini, O. A.; Tascone, R.; Olivieri, A.; Baralis, M.; Orta, Renato; Virone, G.

doi:10.1109/tmtt.2003.809629

Cited by 35 publications

(15 citation statements)

References 9 publications

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“…10 shows the -parameters related with return loss at, and isolation between, circularly polarized ports and at the common waveguide. Measurements are significantly more noisy for these parameters since they are obtained in the last steps of the measurement procedure (see [30]), but satisfactory agreement is found between simulation and measurements. Also for these ports, the return loss and isolation are better than 25 dB in the desired band.…”

Section: Design and Experimental Resultsmentioning

confidence: 89%

“…9-12 show the measurements and the simulated response for the final dimensions, now taking into account conductor losses in the simulation S/m . The measurements were carried out by a procedure similar to that proposed in [30], which provides the different -parameters of the orthomode with respect to the linearly polarized modes in the common port, except for a sign indetermination in the transmission parameters between common and single-mode ports. Solving the sign uncertainty by comparison with the simulated results, and using (7), the -parameters shown in Figs.…”

Section: Design and Experimental Resultsmentioning

confidence: 99%

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Compact Orthomode Transducer Polarizer Based on a Tilted-Waveguide T-Junction

Esteban

Camacho‐Peñalosa

2015

IEEE Trans. Microwave Theory Techn.

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An alternative device to the well-known septum polarizer is proposed, which also provides the double function of an orthomode and a polarizer. It is based on a waveguide T-junction between a common dual-polarization waveguide and a tilted rectangular single-mode waveguide, and offers an intrinsically shorter geometry in the axial dimension, an advisable property when searching for compact antena assemblies. The analysis of this new device is presented, along with the derivation and introduction of the -parameters referred to the circularly polarized modes in the common waveguide. The working principle of the proposed T-junction is also explained in detail. A breadboard is designed, and its simulation and measurement results are presented. As a conclusion, the proposed device seems worthy of comparison in its electrical performances to the septum polarizer, showing some advantages in terms of geometrical dimensions and manufacturability.

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Section: Design and Experimental Resultsmentioning

confidence: 89%

Section: Design and Experimental Resultsmentioning

confidence: 99%

Compact Orthomode Transducer Polarizer Based on a Tilted-Waveguide T-Junction

Esteban

Camacho‐Peñalosa

2015

IEEE Trans. Microwave Theory Techn.

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“…The OMTs have been measured with an adhoc technique described in [1]. The measured return loss is better than -20 dB on a bandwidth of 30%.…”

Section: Orthomode Transducermentioning

confidence: 99%

“…In this work precision measurements of a prototype feed horn array were obtained by calibrating the OMT at the circular port with an ad-hoc technique for dual polarized components [1]. With this technique a circular two-polarization test port can be matched directly to the circular port of the feed horn, without requiring any kind of transition between the WR10 VNA ports and the circular port of the feed horn.…”

Section: Introductionmentioning

confidence: 99%

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A platelet W-band feed horn-OMT assembly

Torto

Bersanelli

Franceschet

et al. 2013

2013 International Conference on Electromagnetics in Advanced Applications (ICEAA)

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Future Cosmic Microwave Background polarisation experiments will require large detector arrays to achieve the required sensitivity for precise measurements. New cost-and time-effective techniques are required for mass production of high performance passive components. We present electromagnetic test results on an assembly of feed horn and OMT prototypes, operating in the W-band and fabricated by means of "platelet" technique. The good level of isolation and return loss (respectively >45 dB, >30 dB on 20% bandwidth) for both polarizations are in agreement with numerical simulations, indicating good matching between components. Radiation patterns are also in agreement with simulations, with cross-polarization level < -30 dB on a 20% bandwidth. These results confirm the good design, manufacturing and assembling of the prototypes.

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

Ruiz‐Cruz¹,

Montejo‐Garai

Rebollar

2008

Int J RF and Microwave Comp Aid Eng

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The full-wave design of broadband ortho-mode transducers based on the Bøi-fot junction has two main aspects: an efficient analysis method and a design process divided into tasks with relatively low computational effort. In the analysis part, a rigorous modematching technique has been developed to obtain the generalized admittance matrix of the Bøifot junction. The other elements of the device are also analyzed by mode-matching. With respect to the design, the proposed procedure starts with the optimization of the individual building blocks of the device. Their interaction is also taken into account in a systematic process. The analysis and design methods have been validated with other numerical methods and an experimental prototype.

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A microwave measurement procedure for a full characterization of ortho-mode transducers

Cited by 35 publications

References 9 publications

Compact Orthomode Transducer Polarizer Based on a Tilted-Waveguide T-Junction

Compact Orthomode Transducer Polarizer Based on a Tilted-Waveguide T-Junction

A platelet W-band feed horn-OMT assembly

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

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