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首页> 外文会议>Microwave Conference Proceedings (APMC), 2011 Asia-Pacific >Tri-band filter with partly combined stepped-impedance resonators
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Tri-band filter with partly combined stepped-impedance resonators

机译：具有部分组合式步进阻抗谐振器的三频滤波器

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摘要

A novel partly combined two half-wavelength SIR resonators (PCSIR) and its application to tri-band filter are presented in this paper. In the PCSIR, a part of one SIR is loaded in the center of the other SIR. The loaded SIR has the twice geometrical width as the other SIR, but with different length of its high impedance microstrip section. The proposed PCSIR is so constructed that the resonant frequencies can be characterized by controlling the length of the loaded SIR and conveniently designed by use of conventional SIR and excited simultaneously in one structure. Two kinds of PCSIR filter configurations with unfolded and folded formats are proposed and analyzed. The unfolded tri-band PCSIR filter at three resonances is characterized to control the FBWs (fractional bandwidth) by explicit J-inverters and susceptances slope. For the folded PCSIR filter, it has the advantage that the characteristics of coupling degree of the second passband can be conveniently controlled, whereas that of first and third passbands are fixed. It is found that the folded PCSIR filter structure can introduce transmission zeros between passbands and exhibit the tri-band response with high selectivity. To verify the proposed approach, two filters are designed and fabricated. The agreement between measured results and the theoretical prediction validates the proposed structure.
机译：提出了一种新颖的部分组合的两个半波长SIR谐振器（PCSIR）及其在三频滤波器中的应用。在PCSIR中，一个SIR的一部分被加载到另一个SIR的中心。加载的SIR具有两倍于其他SIR的几何宽度，但其高阻抗微带段的长度不同。提出的PCSIR的构造使得可以通过控制加载的SIR的长度来表征谐振频率，并可以通过使用常规SIR方便地进行设计并在一种结构中同时激发。提出并分析了两种具有展开和折叠格式的PCSIR滤波器配置。展开的三频PCSIR滤波器在三个谐振点的特征是通过显式J反相器和电纳斜率来控制FBW（分数带宽）。对于折叠式PCSIR滤波器，其优点在于可以方便地控制第二通带的耦合度的特性，而第一和第三通带的耦合度的特性是固定的。发现折叠的PCSIR滤波器结构可以在通带之间引入传输零并且以高选择性展现三带响应。为了验证所提出的方法，设计并制造了两个滤波器。测量结果与理论预测之间的一致性验证了所提出的结构。

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