Wave Matrix Technique for Waveguide Iris Polarizers Simulation. Numerical Results

Authors A.V. Bulashenko , S.I. Piltyay, I.V. Demchenko

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 37, Peremohy Ave., 03056 Kyiv, Ukraine

Е-mail an_bulashenko@i.ua
Issue Volume 13, Year 2021, Number 5
Dates Received 16 April 2021; revised manuscript received 20 October 2021; published online 25 October 2021
Citation A.V. Bulashenko, S.I. Piltyay, I.V. Demchenko, J. Nano- Electron. Phys. 13 No 5, 05023 (2021)
DOI https://doi.org/10.21272/jnep.13(5).05023
PACS Number(s) 84.40.Az, 84.40.Ua
Keywords Microwave devices, Radars, Waveguide polarizer, Iris polarizer, Circular polarization, Differential phase shift, Axial ratio, Crosspolar discrimination.

Nowadays, one of the progressive and effective directions of modern wireless telecommunication technologies is the creation of antenna systems with adaptive processing of signal polarization. Such antenna systems provide the required characteristics of telecommunication systems for various purposes under the conditions of high noises for one of polarizations and influence of interferences caused by multipath propagation. The key elements of dual-polarization antenna systems are the devices of polarization transformation and separation. These devices are widely used in systems for electronic protection of aircrafts, radar systems for metrological purposes, systems for estimation of the state of crops and soil erosion, systems for the recognition and tracking of aircrafts, satellite information systems.This article presents the results of numerical analysis of polarization and matching characteristics of a polarizer based on a square waveguide with three irises. The mathematical model of a polarizer is based on the wave matrix technique. Using this technique, the characteristics of the developed polarizer were determined and optimized in the operating X-band 7.25-7.75 GHz, which is used in downlink satellite communication systems. The presented technique allows to study the evolution of the characteristics of polarizers with different dimensions, such as the heights of the irises and the distances between them. The results of this analysis were used to estimate the initial quasi-optimal dimensions of the polarizer to achieve simultaneously the specified matching and small deviations of the differential phase shift from 90° in the whole operating frequency band. The initial dimensions were used for further optimization of the polarizer design by the finite integration technique. Obtained numerically electromagnetic characteristics of the optimized waveguide iris polarizer showed satisfactory agreement with the same characteristics obtained using the developed analytical technique in the whole operating X-band 7.25-7.75 GHz.

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