一种改进的高效低误差基片集成波导宽带延迟线*

doi:10.7523/j.ucas.2023.034

摘要/Abstract

摘要： 为克服高分辨率星载合成孔径雷达相控阵天线系统中的波束色散问题,本文设计了一种X波段宽带真时间延迟线。该延迟线通过在基片集成波导（SIW）的上表面加载电磁带隙结构（EBG）形成。这相当于增加了单位长度上的电感电容,实现了慢波效应。还引入了一种微带线-SIW锥形过渡结构,在大带宽情况下实现了低损耗。实测结果表明,在8’12GHz频段,延迟倍数达到4倍,即延迟线的延迟时间是相同长度50Ω微带线的4倍。此外,延迟波动,即最大和最小延迟量之差占设计延迟量的百分比仅为2.5%,插入损耗优于-2.5dB,回波损耗优于-15dB。与现有延迟线相比,所提出的延迟线具有延迟效率高、延迟误差小、带宽宽、损耗低的优点,具有良好的实用价值和应用前景。

关键词: SIW, EBG, 低损耗, 高效, 宽带

Abstract: In this paper, a wideband true time delay line for X-band is designed to overcome the beam dispersion problem in a high-resolution spaceborne synthetic aperture radar phased array antenna system. The delay line loads the electromagnetic bandgap (EBG) structure on the upper surface of the substrate integrated waveguide (SIW). This is equivalent to including an additional inductance-capacitance for energy storage, which realizes the slow-wave effect. A microstrip line-SIW tapered transition structure is introduced to achieve a low loss and a large bandwidth. In the frequency band between 8-12 GHz, the measured results show that the delay multiplier of the delay line reaches 4 times, i.e., delay line’s delay time is 4 times larger than 50Ω microstrip line with same length. Furthermore, the delay fluctuation, i.e., the difference between the maximum and minimum delay as a percentage of the standard delay is only 2.5%, the insertion loss is better than -2.5 dB, and the return loss is better than -15 dB. Compared with the existing delay lines, the proposed delay line has the advantages of high delay efficiency, low delay error, wide bandwidth and low loss, which has good practical value and application prospects.

Key words: SIW, EBG, low error, high Efficiency, wideband

中图分类号:

TN957.2

张洪熙, 王沛. 一种改进的高效低误差基片集成波导宽带延迟线^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2023.034.

ZHANG Hongxi, WANG Pei. An improved high efficiency low error substrate integrated waveguide wideband delay line[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2023.034.

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一种改进的高效低误差基片集成波导宽带延迟线^*

An improved high efficiency low error substrate integrated waveguide wideband delay line

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