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引用次数: 0
摘要
本文介绍了一种利用滤波器-天线设计方法增强圆极化天线带宽的技术。该设计依赖于添加一个与辐射元件耦合的谐振器--在全球导航卫星系统中为 L 形槽天线。馈电结构的这一变化拓宽了阻抗和轴向比（AR）带宽，使设计更加灵活。与采用传统馈电的参考 L 形槽天线相比，所提出的天线设计在 1.2 至 1.81 千兆赫的频率范围内实现了阻抗匹配带宽翻番，从 19% 提高到 41%，在 1.17 至 1.84 千兆赫的频率范围内实现了更宽的 AR 带宽，从 35% 提高到 44.5%。AR 带宽覆盖了整个阻抗带宽。此外，还研究和讨论了金属反射器对天线性能的影响。
Bandwidth enhancement of circularly polarised slot global navigation satellite systems antenna using an integrated filter-antenna approach
A technique to enhance the bandwidth of a circularly polarised antenna using the filter-antenna design approach is presented. The design relies on adding a resonator coupled to the radiation element—an L-shaped slot antenna in the case of global navigation satellite systems. This change in the feeding structure broadens both the impedance and the axial ratio (AR) bandwidths and allows more design flexibility. Compared with a reference L-shaped slot antenna with a conventional feed, the proposed antenna design achieves a doubling of the impedance matching bandwidth from 19% to 41% over the frequency range from 1.2 to 1.81 GHz and a wider AR bandwidth from 35% to 44.5% in the range from 1.17 to 1.84 GHz. The AR bandwidth covers the entire impedance bandwidth. The effect of a metal reflector on antenna performance is also investigated and discussed.
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