Bibliographies thématiques / Orthomode transducers (OMTs)

Littérature scientifique sur le sujet « Orthomode transducers (OMTs) »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Orthomode transducers (OMTs)"

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Navarrini, Alessandro, et Renzo Nesti. « Characterization Techniques of Millimeter-Wave Orthomode Transducers (OMTs) ». Electronics 10, no 15 (31 juillet 2021) : 1844. http://dx.doi.org/10.3390/electronics10151844.

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We report on advanced techniques for the accurate characterization of millimeter-wave Orthomode Transducers (OMTs) enabling the derivation of the fundamental parameters of such devices, i.e., the insertion loss, the return loss, the cross-polarization, and the isolation. These techniques include standard frequency-domain and time-domain VNA (Vector Network Analyzer) measurement methods, which can be applied to remove the effects of the waveguide transitions necessary to access the OMT ports and excite the desired modes. After reviewing the definition of the OMT parameters, we discuss the test equipment, the VNA calibration procedures as well as the VNA time-domain time-gating method for application in OMT characterization. We present simplified equations that relate the calibrated VNA measured quantities with the OMT S-parameters, illustrate various characterization methods, and examine various OMT experimental test setups. The advantages and disadvantages of each of the OMT characterization procedures are presented and compared among them. We provide a list of waveguide components required in the OMT test setups (adapters, loads, quarter-wave and longer waveguide sections, feed-horn, etc.), discuss the error terms introduced by such components and examine their impact on the measured values. Furthermore, we identify strategies to mitigate or remove the effects of the measured errors, to derive the desired OMT parameters. Different OMT configurations, with a distinct orientation of the waveguide input and outputs, are discussed. Although the presented techniques refer to the characterization of a specific configuration of a W-band OMT, the described methods can be applied to other OMT configurations and frequency ranges (from microwave to THz frequencies), therefore having a general validity.
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Henke, Doug, et Stephane Claude. « Minimizing RF Performance Spikes in a Cryogenic Orthomode Transducer (OMT) ». IEEE Transactions on Microwave Theory and Techniques 62, no 4 (avril 2014) : 840–50. http://dx.doi.org/10.1109/tmtt.2014.2309551.

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Gonzalez, Alvaro, et Shin’ichiro Asayama. « Double-Ridged Waveguide Orthomode Transducer (OMT) for the 67–116-GHz Band ». Journal of Infrared, Millimeter, and Terahertz Waves 39, no 8 (14 juin 2018) : 723–37. http://dx.doi.org/10.1007/s10762-018-0503-5.

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Fonseca, Nelson J. G. « Very Compact Waveguide Orthomode Transducer in the K-Band for Broadband Communication Satellite Array Antennas ». Sensors 23, no 2 (9 janvier 2023) : 735. http://dx.doi.org/10.3390/s23020735.

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A very compact waveguide orthomode transducer (OMT) is described in this paper. The design is characterized with a twofold rotationally symmetric cross-section in the probing area, adapted from a side-coupling OMT design, simultaneously enabling low port-to-port coupling and high cross-polarization discrimination (XPD) over a fractional bandwidth of about 15–20%. Compared to previously reported compact waveguide OMTs, the proposed design is simpler, thus facilitating its manufacture at millimeter-wave frequencies. The concept is demonstrated with a design in the K-band for a broadband communication satellite downlink over the frequency band of 17.3–20.2 GHz. For test purposes, transitions to standard waveguide WR42 are included, and the OMT is assembled with a conical horn antenna. The measured reflection and coupling coefficients are below −19.5 dB and −22.9 dB, respectively, over the nominal bandwidth, and they are in good agreement with the simulation’s results. The on-axis XPD, measured in an anechoic chamber, is better than 30 dB over the nominal bandwidth, which is also in line with simulations. The proposed waveguide OMT may be designed to fit in a lattice below one wavelength at the highest operating frequency, which is desirable for dual-polarized closely spaced array antennas in low and medium Earth orbit communication satellite systems. The simple mechanical design of the proposed OMT makes it particularly appealing for additive manufacturing techniques, as demonstrated with a variant of the design having folded single-mode waveguides, which preserves the RF properties of the original design.
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Xiao, Jun, Geer Teni, Hongmei Li, Tongyu Ding et Qiubo Ye. « A Dual-Polarized Horn Antenna Covering Full Ka-Band Using Turnstile OMT ». Frontiers in Physics 10 (5 avril 2022). http://dx.doi.org/10.3389/fphy.2022.880606.

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This article presents a dual-polarized corrugated horn antenna incorporated a turnstile orthomode transducer (OMT) covering the full Ka-band (26.5–40 GHz). A three-stepped cylindrical tuning stub scattering element is designed in the turnstile junction to combine/split the two linearly polarized waves with high isolation. The proposed turnstile OMT shows a good simulated return loss better than 20 dB and a high isolation higher than 57 dB within the whole Ka-band. Then, a corrugated horn antenna with five-stage choke rings is designed. Finally, the proposed horn antenna incorporated in the turnstile OMT is fabricated and measured. The measured impedance bandwidth for |S11/22|≤ −15 dB is 50.7% from 25 to 42 GHz. The measured peak gain is 11.9 dBi. The proposed antenna system is a promising candidate for the 5G millimeter-wave applications.
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Chapitres de livres sur le sujet "Orthomode transducers (OMTs)"

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Yeap, Kim Ho, et Kazuhiro Hirasawa. « Fundamentals of a Radio Telescope ». Dans Advances in Environmental Engineering and Green Technologies, 33–55. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2381-0.ch002.

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In radio astronomy, radio telescopes are used to collect radio waves emanated from cosmic sources. By analyzing these signals, the properties of the sources could be unraveled. A telescope typically consists of the following astronomical instruments: a primary and a secondary reflector, receiver optics which usually includes a lens or a pair of mirrors and a pair of feed horns (one for each orthogonal polarization [or simply a corrugated horn with an orthomode transducer OMT]), waveguides, a mixer circuit, a local oscillator, amplifiers, a detector circuit, and a data processing unit. This chapter provides a concise but complete overview of the working principle of the astronomical instruments involved in the construction of a radio telescope. The underlying physics of the components in a radio telescope, ranging from the antenna to the front-end and back-end systems, are illustrated.
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Actes de conférences sur le sujet "Orthomode transducers (OMTs)"

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Zhou, Zhen, Bo Zhang, Zhongqian Niu et Yong Fan. « A Design of Terahertz Wave Orthomode Transducer (OMT) ». Dans 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2019. http://dx.doi.org/10.1109/icmmt45702.2019.8992171.

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Granet, Christophe, et John S. Kot. « A New Type of Octave-Bandwidth Orthomode Transducer : The Bullet OMT ». Dans 2020 4th Australian Microwave Symposium (AMS). IEEE, 2020. http://dx.doi.org/10.1109/ams48904.2020.9059410.

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Tang, Xiuming, Kaiqiang Zhu, Yu Xiao et Houjun Sun. « Design of a Waveguide Orthomode Transducer (OMT) at 340 GHz band ». Dans 2022 IEEE Conference on Antenna Measurements and Applications (CAMA). IEEE, 2022. http://dx.doi.org/10.1109/cama56352.2022.10002478.

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Latif, M., A. U. Salfi et M. Q. Shafique. « Design & ; full-wave EM simulation of Ku-band orthomode transducer (OMT) ». Dans 2013 10th International Bhurban Conference on Applied Sciences and Technology (IBCAST 2013). IEEE, 2013. http://dx.doi.org/10.1109/ibcast.2013.6512178.

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