The sleeve balun does not give any impedance transformation it is a9 balun.
上面的巴伦应该是能改变阻抗的
Analysis of a Novel Symmetric Broadside Coupled Coplanar Waveguide Balun
一种新型对称宽边耦合共面波导巴仑的分析
Experimental results revealed that the presence of the balun improved the measurement accuracy of the radiation patterns of printed monopole antennas.
实验结果亦显示出双频巴伦改善了天线辐射场形的量测。
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