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提出了一种基于加载环缝高次模的新型双频段大频差天线,其具体结构为在蝶形天线两臂上对称地加载一对闭合圆环缝隙。常规的环缝加载方式为开口环缝加载,该加载方式环缝工作在基模;而本文提出的闭合环缝加载,可使环缝工作在高次模。加载环缝高次模的利用,可使天线在实现大频差的同时确保其在高频段的性能。所研制的天线可实现超过3∶1的大频差,仿真和实测结果表明:天线在两个频段都具有良好的性能。新型天线结构的研制成功丰富了多频天线的种类,为实现大频差天线提供了一种新的思路和方法。
A new type of dual-band large-difference antenna based on loading high-order circular girth modes is proposed. Its structure is that a pair of closed circular rings are symmetrically loaded on the two arms of the butterfly antenna. The conventional method of girth loading is opening girth loading, and the loading mode girth work in the basic mold. However, the closed girth loading proposed in this paper can make the girth work in the high-order mode. Loaded girth mode use of high order mode, the antenna can achieve large frequency difference while ensuring its performance in the high frequency band. The developed antenna can achieve a large frequency difference of more than 3: 1. The simulation and measured results show that the antenna has good performance in both frequency bands. The successful development of the new antenna structure has enriched the types of multi-band antennas and provided a new way of thinking for the realization of large-difference antennas.