Comparative Analysis of Compact Satellite Polarizers Based on a Guide with Diaphragms

Shuliak

et al. 2021

AEM

Self Cite

In this article we present the results of mathematical simulation, development and optimization of a waveguide polarizer with a diaphragm and pins. A mathematical model was developed using the proposed approach on the example of a waveguide polarizer with one diaphragm and two pins. The diaphragm and pins were modeled as inductive or capacitive elements for two types of linear polarization of the fundamental modes. The applied model uses a wave scattering matrix. The total matrix of a polarizer was obtained using wave matrices of transmission of individual elements of the device structure. Using the elements of the common S-parameters the electromagnetic characteristics of the device, which is considered, were obtained. To check the performance of the developed mathematical model, it was simulated in a software using the finite element technique in the frequency domain. The designed structure of the polarizer is adjustable due to mechanical change in the length of the pins. The developed waveguide polarizer with one diaphragm and two pins provides a reflection coefficient of less than 0.36 and a transmission coefficient of more than 0.93 for two types of polarizations. Therefore, a new theoretical method was developed in the article for analysis of scattering matrix elements of a waveguide polarizer with diaphragms and pins. It can also be used for the development of new tunable waveguide polarizers, filters and other components with diaphragms and pins.

Section: Theoretical Modeling Of Waveguide Polarizers With Diaphragm and Pinsmentioning

confidence: 99%

“…For the theoretical analysis we will apply a single-wave approach using the wave matrix technique [85][86][87]. The equivalent networks of a considered waveguide polarizer for the cases of capacitive and inductive diaphragms are given in Fig.…”

Section: Theoretical Modeling Of Waveguide Polarizers With Diaphragm and Pinsmentioning

confidence: 99%

Electromagnetic Simulation of New Tunable Guide Polarizers with Diaphragms and Pins

Shuliak

et al. 2021

AEM

Self Cite

“…1. For the theoretical analysis of the device we will use a single-wave approximation and the techniques of wave matrix theory [76]- [80]. The equivalent circuits of a waveguide polarizer for the case of inductive and capacitive diaphragms are given in Fig.…”

Section: Theoretical Analysis Of Waveguide Polarizer With Four Diaphragmsmentioning

confidence: 99%

Mathematical Model of a Square Waveguide Polarizer with Diaphragms

J. Microw. Optoelectron. Electromagn. Appl.

2021

The development of new mathematical model for guide polarization converter with diaphragms was carried out in the research by the method of wave matrices. In addition, numerical modeling of the performance of a polarizer with diaphragms is made by simulating the propagation of the fundamental modes with perpendicular linear polarizations. The wave matrix model was obtained by splitting the polarizer into separate structural elements. Each element was described by its own wave transmission matrices. As a result, a general wave scattering matrix was formed. Based on the elements this matrix the electromagnetic characteristics of the considered polarizer were obtained theoretically. In particular, complex reflection and transmission coefficients were calculated. Their modules and phases were analyzed in the frequency interval 10.7-12.8 GHz. To check the correctness of the obtained results an independent numerical simulation was carried out applying the finite element methodology in the frequency interval. The results of both approaches are in good agreement. The engineered converter of polarization with four diaphragms provides a reflection coefficient modulus of less than 0.14 and a transfer coefficient modulus of more than 0.99 for two orthogonal types of polarizations. As a result, a rigorous mathematical method was developed to analyze the elements of the scattering matrix of a waveguide polarizer with diaphragms. It can be used for the development of new broadband waveguide polarizers and waveguide filters based on diaphragm elements.

“…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%

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

Int J RF Mic Comp-Aid Eng

2022

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.