Distributed-Element Reflectionless Bandstop Filter With a Broadband Impedance Matching
Distributed-Element Reflectionless Bandstop Filter With a Broadband Impedance Matching
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DOI：
10.1109/lmwc.2020.2990986
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发表时间：
2020-06
影响因子：
3
通讯作者：
Jong-Hyuk Lee;Juseop Lee
中科院分区：
文献类型：
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作者：
Jong-Hyuk Lee;Juseop Lee
在这封信中，我们提出了一个系统的设计方法，无反射带阻滤波器使用分布元件谐振器。所提出的滤波器结构的一个独特的特点是，它是能够产生一个宽带阻抗匹配在两个端口与平坦的通带。为了验证设计方法，二阶巴特沃思无反射带阻滤波器的中心频率为2 GHz的分数带宽为8%的设计，制造和测量。测量结果表明，从直流到3f {0}$，回波损耗（S_{11}$和S_{22}$）总体上大于10 dB。
In this letter, we present a systematic design method for a reflectionless bandstop filter using distributed-element resonators. One unique feature of the presented filter structure is that it is capable of producing a broadband impedance matching at both ports with a flat passband. For verifying the design approach, a second-order Butterworth reflectionless bandstop filter centered at 2 GHz with fractional bandwidth of 8% has been designed, fabricated, and measured. The measurement shows that the return losses ( $S_{11}$ and $S_{22}$ ) are overall larger than 10 dB from DC to $3f_{0}$ .