机载双频共口径宽波束圆极化天线设计

发布时间：2018-03-10 15:09

本文选题：双频段　切入点：宽波束　出处：《西安电子科技大学学报》2017年02期 　论文类型：期刊论文

【摘要】：现有的共口径天线一般关注多频多极化的天线性能,但剖面较高、结构复杂.笔者提出了一种结构简单、波束覆盖范围宽的双频共口径圆极化天线.该天线采用微带天线叠层技术加高介电常数介质基板实现了双频段4个频点的天线共用一个口径,达到降低天线体积和重量的目的;该天线的4个工作频点均可由对应的物理尺寸自由调节.通过在微带天线上加载高介电常数介质板,提高了天线在低仰角方向的增益,展宽了天线波束.设计并采用了宽带功分移相网络加耦合馈电的方法实现4个频段的圆极化特性.天线各频段实测的阻抗带宽、轴比和方向图都与仿真结果吻合良好,该天线的设计方法可以推广应用于实现更多频段的共口径天线设计.
[Abstract]:The existing common aperture antennas focus on the performance of multi-frequency and multi-polarization antennas, but the profile is high and the structure is complex. The dual-frequency circularly polarized antenna with common aperture with wide coverage of the beam is designed. The microstrip antenna stack technique is used to increase the dielectric constant dielectric substrate to achieve the goal of reducing the size and weight of the antenna by sharing one aperture with four frequency points in the double frequency band. The four operating frequency points of the antenna can be adjusted freely by the corresponding physical size. By loading the dielectric constant dielectric plate on the microstrip antenna, the gain of the antenna in the low elevation direction is improved. The antenna beam is broadened, and the method of wideband power division and phase shift network coupled with coupling feed is designed and used to realize the circular polarization characteristics of four frequency bands. The measured impedance bandwidth, axial ratio and pattern of the antenna are in good agreement with the simulation results. The design method of the antenna can be extended to realize the common aperture antenna design in more frequency bands.
【作者单位】：西安电子科技大学天线与微波技术重点实验室;中国西南电子技术研究所;
【基金】：中国电子科技集团第10研究所基金资助项目(CETC10-F1)
【分类号】：TN821.1

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