Novel dual-mode dual-band filters using coplanar-waveguide-fed ring resonators
Novel dual-mode dual-band filters using coplanar-waveguide-fed ring resonators
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DOI：
10.1109/tmtt.2007.906501
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发表时间：
2007-10-01
影响因子：
4.3
通讯作者：
Xue, Quan
中科院分区：
文献类型：
--
作者：
Zhang, Xiu Yin;Xue, Quan
本文提出了一种中心频率和带宽独立控制的双模双频带通滤波器的设计方法。采用两个微扰环形谐振器获得双模双频响应。新型馈电结构的引入，同时向环形谐振器馈电，并方便地控制谐振器和馈线之间的耦合强度，从而在很宽的可调范围内的外部品质因数。提出了两种结构紧凑的滤波器。它们都提供了足够的自由度，以满足各种要求的外部品质因数和耦合系数在两个通带。因此，两个通带的中心频率和部分带宽可以在宽范围内独立地调谐到期望的规格。为了验证所提出的方法，实现了四个过滤器。测量结果显示出高选择性的双模双通带响应。
This paper presents a novel approach for designing dual-mode dual-band bandpass filters with independently controlled center frequencies and bandwidths. Two microstirip perturbed ring resonators are employed to obtain dual-mode dual-band responses. Novel feeding structures are introduced to simultaneously feed the ring resonators and conveniently control the coupling strength between resonators and feeding lines, resulting in a wide tunable range of external quality factors. Two kinds of filter configurations with compact size are proposed. Both of them provide sufficient degrees of freedom to satisfy various requirements of external qualify factors and coupling coefficients at both passbands. Therefore, the center frequencies and fractional bandwidths of both passbands can be independently tuned to desired specifications within a wide range. To verify the proposed method, four filters are implemented. The measured results exhibit dual-mode dual-band bandpass responses with high selectivity.