Electromagnetic and bandwidth performance optimization of new waveguide polarizers with septum of a stepped-thickness type for satellite systems

Piltyay, Stepan

doi:10.1080/09205071.2021.2016500

Cited by 3 publications

(3 citation statements)

References 53 publications

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“…On the other side, the increase of number of steps results in the increase of optimization time and into complexity of the simulation process. Besides, some previous scientific works on waveguide polarizers with longitudinal conducting plates [27,28] have demonstrated than their electromagnetic characteristics improve less with each additional step applied in the septulum design. This means that several steps of septulum are an optimal choice for the design with moderate characteristics and bandwidths.…”

Section: Structure and Working Principle Of A Septulum Polarization C...mentioning

confidence: 99%

Compact 2-step Septulum Polarization Converters for Radars and Satellite Systems

Piltyay

Bulashenko

Fesyuk

et al. 2022

AEM

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This article presents the results of analysis, numerical simulations and optimization of new narrowband guide septulum polarization converters. Orthomode duplexers and polarization converter designs based on septulums are widely used in modern microwave systems with orthogonal circularly polarized signals. Septulum guide polarizer is an effective compact device, which transforms right-hand circularly polarized (RHCP) and left-hand circularly polarized (LHCP) electromagnetic modes into linearly polarized ones. At the same time it divides RHCP and LHCP modes and directs them to two different rectangular guides with high signal discrimination to each other. Thus, a septulum-based guide device integrates performance of a polarization transformer and of an orthomode duplexer. The main electromagnetic characteristics of the polarization converter were simulated in software based on the finite elements method in the frequency domain. The proposed design of a compact narrowband guide polarization converter has a septulum with two steps. Several designs of septulum polarization converters were developed and compared for different relative bandwidths of 5%, 10%, and 15%. The comparative investigation of the obtained designs was carried out. Main electromagnetic characteristics of optimal septulum polarization converters were compared. These include return losses, cross-polarization discrimination, ellipticity parameter, and ports discrimination. It was demonstrated that in 5% fractional bandwidth a compact 2-stepped septulum polarization converter has return losses greater than 22 dB. Its cross-polarization discrimination and ports discrimination are greater than 25 and 27 dB. Developed compact septulum polarization converters can be applied in modern antenna systems for radars and satellite communication systems.

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Section: Structure and Working Principle Of A Septulum Polarization C...mentioning

confidence: 99%

Compact 2-step Septulum Polarization Converters for Radars and Satellite Systems

Piltyay

Bulashenko

Fesyuk

et al. 2022

AEM

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“…Wideband antenna systems with the possibility of simultaneous operation at two orthogonal circular or linear polarizations require application of specific kinds of waveguides (with irises, 22–30 ridges, 31–39 corrugations, 40–44 posts, 45–50 or a longitudinal septum 51,52 ) and microwave devices in the antenna system's structure 53–60 . One of frequently used and compact solutions for the operation at two orthogonal circular polarizations are the integration of a septum‐based polarization converter into a waveguide antenna feed system 61–65 .…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14] The advantages include the reduction of amplitude and polarization distortions caused by Faraday effect in the ionosphere and by the multipath propagation in urban environments and mobile systems. [15][16][17][18][19][20][21] Wideband antenna systems with the possibility of simultaneous operation at two orthogonal circular or linear polarizations require application of specific kinds of waveguides (with irises, [22][23][24][25][26][27][28][29][30] ridges, [31][32][33][34][35][36][37][38][39] corrugations, [40][41][42][43][44] posts, [45][46][47][48][49][50] or a longitudinal septum 51,52 ) and microwave devices in the antenna system's structure. [53][54][55][56][57]…”

Section: Introductionmentioning

confidence: 99%

Computer‐aided development and experimental investigation of a double‐ridged orthomode transducer for modern satellite and space communication systems

Piltyay

2022

Int J RF Mic Comp-Aid Eng

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This article presents results of development, optimization, and experimental measurements of electromagnetic characteristics of a wideband orthomode transducer for satellite and space communications. Analyzed design of the transducer is based on a double‐ridged waveguide junction, which allows to obtain high level of discrimination of fundamental electromagnetic modes with perpendicular linear polarizations. Numerical modeling of the designed microwave waveguide orthomode transducer was performed by an effective finite elements method in the frequency domain. Optimization of the structure elements allowed to obtain high quality of matching and to improve the isolation between orthogonal polarizations simultaneously. To optimize the electromagnetic performance of the developed orthomode transducer a trust region method, which previously demonstrated its effectiveness for the improvement of electromagnetic characteristics of waveguide polarization converters, was applied. Experimental measurements of all scattering parameters of an antenna feed system, which included a designed orthomode transducer and a corrugated horn, were performed for the verification of simulated results. Results of computer‐aided modeling and of measurements are in agreement. Measured good matching and high level of isolation between orthogonal polarizations confirm effective electromagnetic performance of the developed orthomode transducer. Designed wideband waveguide device can be applied in modern microwave antenna systems operating simultaneously at two linear or circular polarizations of electromagnetic waves.

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Broadband Resonance-Free Septum Circular Polarizer Operating Above 200 GHz

Zhang

Zhu

Chen

et al. 2023

IEEE Trans. Antennas Propagat.

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Electromagnetic and bandwidth performance optimization of new waveguide polarizers with septum of a stepped-thickness type for satellite systems

Cited by 3 publications

References 53 publications

Compact 2-step Septulum Polarization Converters for Radars and Satellite Systems

Compact 2-step Septulum Polarization Converters for Radars and Satellite Systems

Computer‐aided development and experimental investigation of a double‐ridged orthomode transducer for modern satellite and space communication systems

Broadband Resonance-Free Septum Circular Polarizer Operating Above 200 GHz

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