宽带高性能四脊波导圆极化器设计

王进; 杜彪; 孙立杰; 解磊

doi:10.11999/JEIT180423

宽带高性能四脊波导圆极化器设计

doi: 10.11999/JEIT180423

王进^1, ,,
杜彪¹,
孙立杰¹,
解磊^{1, 2}

1.
中国电子科技集团公司第五十四研究所石家庄 050081
2.
西安电子科技大学天线与微波技术重点实验室西安 710071

基金项目: 国家高技术研究发展计划(2014AA123601)，政府间国际科技创新合作重点专项(2016YFE0100100)

详细信息

作者简介:
王进：男，1983年生，博士生，高级工程师，研究方向为微波无源器件、天线馈电网络与馈源技术

杜彪：男，1962年生，博士生导师，研究员，研究方向为反射面天线和高效率馈源、阵列天线和超材料天线等

孙立杰：男，1985年生，工程师，研究方向为微波无源器件、天线馈电网络

解磊：男，1985年生，博士生，研究方向为卫星通信天线与馈源技术

通讯作者:
王进　15831969575@139.com

中图分类号: TN821
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出版历程
- 收稿日期: 2018-05-04
- 修回日期: 2018-10-10
- 网络出版日期: 2018-11-01
- 刊出日期: 2019-03-01

Design of Wideband High Performance Quad-ridge Waveguide Polarizer

Jin WANG^{1
, ,},
Biao DU¹,
Lijie SUN¹,
Lei XIE^{1, 2}

1.
The 54th Research Institute of CETC, Shijiazhuang 050081, China
2.
Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi’an 710071, China

Funds: The National High Technology Research and Development Program of China (2014AA123601), The Bilateral Inter-Governmental Science and Technology Cooperation Proposal of China (2016YFE0100100)

摘要

摘要:
在射电望远镜和卫星通信天线中，圆极化器是关键部件之一。传统圆极化器在保证0.75 dB轴比时的相对带宽最多为41%，无法满足日益增长的宽频带应用需求。该文利用四脊波导的宽带特性，通过采用具有不同尺寸的水平脊和垂直脊，使四脊波导两个正交主模的相位常数不同，来实现宽带移相特性，并给出了一种宽带四脊波导圆极化器的设计方法。按照这一方法，设计了一款宽带C波段圆极化器，工作带宽为3.625～7.025 GHz，相对带宽64%。该文还研究了圆极化器主要参数变化对其性能的影响，加工并实测了一个圆极化器样机。实测结果显示出，该圆极化器两个正交极化的反射损耗均小于–21 dB，相差90°±3.8°，相应的轴比小于0.6 dB。测试与仿真结果吻合良好，证明了分析与设计方法的正确性。
- 天线 /
- 圆极化器 /
- 宽频带 /
- 四脊波导 /
- 敏感性分析
Abstract:
Circular polarizer is a key component in feed systems with circular polarization in radio astronomy telescope and satellite communication antennas. Conventional polarizers are capable of operating over a maximum bandwidth of 40% with an axial ratio value of 0.75 dB, which is unable to meet the growing demand for wide band applications. In this paper, the design of the wide band quad ridges waveguide polarizer is introduced, and the relationship between the phase constants of two orthogonal principal modes is analyzed. The broadband phase shift characteristics are achieved by employing different horizontal and vertical ridges dimensions. Based on this method, a C-Band polarizer is designed, which operates at 3.625～7.025 GHz, 64% bandwidth. The effects of main parameters on the polarizer performances are studied. A prototype of the polarizer is developed. The measurements of the prototype show that return losses are less than –21 dB for two orthogonal polarizations and the phase difference is 90°±3.8°, the corresponding axial ratio is less than 0.6 dB. Measured and simulated results show good agreements, thus validating the analysis and design methods.
- Antenna /
- Circular polarizer /
- Wideband /
- Quad-ridge waveguide /
- Sensitivity analysis

HTML全文

图 1 四脊波导圆极化器结构示意图

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图 2 四脊波导TE₁₀和TE₀₁模场分布图

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图 3 四脊波导圆极化器仿真模型

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图 4 相位常数随频率的变化曲线

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图 5 垂直脊厚度s₁对圆极化器性能的影响图

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图 6 水平脊厚度s₂对圆极化器性能的影响

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图 7 垂直脊间距d₁对圆极化器性能的影响

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图 8 水平脊间距d₂对圆极化器性能的影响

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图 9 圆极化器结构与加工工艺设计

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图 10 s₁, s₂, d₁, d₂误差均为+0.03 mm或为–0.03 mm情况下对圆极化器性能影响

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图 11 s₁, d₂误差为+0.03 mm, s₂, d₁为–0.03 mm和s₁, d₂为–0.03 mm, s₂, d₁为+0.03 mm情况下对圆极化器性能影响

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图 12 圆极化器样机照片和性能仿真与测试结果

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表 1 四脊波导结构参数值(mm)

参数	a	b	d₁	d₂	s₁	s₂
数值	45	45	13	31	7	4

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表 2 四脊波导圆极化器主要参数表(mm)

参数	a	b	d₁	d₂	s₁	s₂	L
数值	47.13	47.13	12.93	32.24	6.84	4.67	207

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表 3 四脊波导圆极化器与其他型式圆极化器的实测性能比较

圆极化器类型	相对带宽(%)	反射损耗(dB)	相位平坦度	轴比(dB)	来源
螺钉极化器	15	≤ –20	90°±3°	≤ 0.50	文献[4,5]
介质极化器	25	≤ –20	90°±4.5°	≤ 0.75	文献[6,7]
波纹极化器	41	≤ –24	90°±4°	≤ 0.60	文献[8–10]
隔板极化器	23	≤ –25	90°±5°	≤ 0.75	文献[11–16]
双脊极化器	15	≤ –25	90°±3°	≤ 0.50	文献[17,18]
四脊极化器	64	≤ –21	90°±3.8°	≤ 0.60	本文

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