何海波,金铭,韩宇南,等. 亚毫米波段折叠光路的准光近场照射天线设计与应用[J]. 电波科学学报,2022,37(4):704-709 + 718. DOI: 10.12265/j.cjors.2021158
      引用本文: 何海波,金铭,韩宇南,等. 亚毫米波段折叠光路的准光近场照射天线设计与应用[J]. 电波科学学报,2022,37(4):704-709 + 718. DOI: 10.12265/j.cjors.2021158
      HE H B, JIN M, HAN Y N, et al. Design and application of the path-folded near-field quasi-optical antennas in sub-millimeter wave[J]. Chinese journal of radio science,2022,37(4):704-709 + 718. (in Chinese). DOI: 10.12265/j.cjors.2021158
      Citation: HE H B, JIN M, HAN Y N, et al. Design and application of the path-folded near-field quasi-optical antennas in sub-millimeter wave[J]. Chinese journal of radio science,2022,37(4):704-709 + 718. (in Chinese). DOI: 10.12265/j.cjors.2021158

      亚毫米波段折叠光路的准光近场照射天线设计与应用

      Design and application of the path-folded near-field quasi-optical antennas in sub-millimeter wave

      • 摘要: 介绍了一种新颖的折叠光路近场准光照射天线设计方法,并成功应用在微波黑体定标源微弱散射的双站测量中. 在双站测量中,传统的小口径天线适用于低频范围,被测目标足够小才能保证远场条件. 与传统基于远场条件出发的小口径天线设计不同,本文所提出的准光照射天线的设计目的是在目标区降低链路衰减,实现相位平坦、幅值边缘衰减的聚焦照射,并可在近场区域内测得目标的远场散射特征. 设计基于准光学设计方法:由主反射镜和平板反射镜共同构成紧凑的折叠光路,首先确定馈源喇叭天线的等效高斯波束参数,然后基于高斯波束传播理论设计主反射镜,再通过全波仿真验证其折叠路径. 仿真分析表明即使馈源采用基本的圆锥喇叭馈源,也可实现良好的聚焦效果. 双站实测数据表明该天线设计达到了设计目的,为亚毫米波近场双站散射测量的开展提供了关键性的波束控制,具备广泛的应用价值.

         

        Abstract: In this paper, a novel path-folded near-field quasi-optical antenna is introduced, which is successfully applied to the bi-static measurement of weak scattering from microwave blackbody. In the bi-static measurement, traditionally small aperture antennas are frequently utilized in the low frequency range, and the target under test shall be small enough for ensuring the far-field condition. Different from the traditional design of small aperture antenna based on far-field condition, the design purpose of quasi-optical antenna in this work is to realize focused illumination with flat phase and amplitude edge attenuation in the target area, for reducing the link attenuation, and measuring the far-field scattering characteristics of the target in the near-field area. The design is based on the quasi optical design method, which consists of the main mirror and the flat mirror to form a compact folded optical path. The design process starts at the equivalent Gaussian beam parameter determination of the feeder horn antenna, then the main mirror is designed based on the Gaussian beam propagation methodology, and further the folded path is examined by full-wave simulations. The simulation results show that good focusing effect can be achieved even if the basic conical horn feed is used. The bi-static measured data show that the design of the antenna achieves the design purpose, and provides a key beam control for the development of the near-field bi-static scattering measurement of sub-millimeter wave, which is a good reference for applications.

         

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