New Tunable Iris-Post Square Waveguide Polarizers for Satellite Information Systems

S. Piltyay, A. Bulashenko, H. Kushnir, O. Bulashenko
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引用次数: 31

Abstract

This paper presents new tunable square waveguide polarizers for satellite information systems. The wide operation frequency band is provided by the application of irises to obtain good matching and polarization characteristics simultaneously. The tuning option is provided by utilization of antiphase posts in the design. The height of the posts can be variable. This allows fine tuning of the differential phase shift between the fundamental modes with vertical and horizontal polarizations at the output of a waveguide polarizer. The structures of polarizers were divided into identical iris-post section. The section was analyzed using wave matrices technique and its characteristics were optimized. The general transfer matrix of the polarizer was obtained as the product of transfer matrices of iris-post waveguide sections and of equivalent transmission lines. Two designs of polarizers were developed for the operating X-band 7.7–8.5 GHz. The polarizer with two 45° sections provides voltage standing wave ratio less than 1.23 for both horizontal and vertical polarizations. Introduced differential phase shift is 90° ± 3.25°. Simulated axial ratio is less than 0.5 dB. The corresponding crosspolar discrimination is higher than 31 dB. Developed polarizer with three 30° sections provides voltage standing wave ratio less than 1.17 for both polarizations. The differential phase shift lies within the range 90° ± 2.2°. Simulated axial ratio is less than 0.34 dB. The corresponding crosspolar discrimination is higher than 34 dB. New tunable iris-post square waveguide polarizers can be applied in modern communication systems.
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用于卫星信息系统的新型可调谐虹膜-后方波波导偏振器
提出了一种用于卫星信息系统的新型可调谐方波导偏振器。虹膜的应用提供了较宽的工作频带,同时获得了良好的匹配和偏振特性。在设计中利用反相柱提供了调谐选项。柱子的高度可以改变。这允许在波导偏振器输出的垂直和水平偏振的基本模式之间的微分相移进行微调。偏振镜的结构被划分为相同的虹膜-柱截面。利用波动矩阵技术对该剖面进行了分析,优化了剖面的特性。得到了偏光镜的一般传输矩阵,即虹膜-柱波导截面传输矩阵与等效传输线传输矩阵的乘积。针对7.7-8.5 GHz工作x波段,研制了两种偏振器设计。具有两个45°截面的偏振器在水平和垂直极化时提供的电压驻波比小于1.23。引入的差分相移为90°±3.25°。模拟轴比小于0.5 dB。相应的交叉极化鉴别值大于31 dB。开发了三个30°部分的偏振器,两个偏振的电压驻波比小于1.17。差相移在90°±2.2°范围内。模拟轴比小于0.34 dB。相应的交叉极化鉴别值大于34 dB。新型可调谐虹膜-柱式方波波导偏振器可应用于现代通信系统。
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