Two Topologies of Balanced Dual-Band Bandpass Filters with Extended Common-Mode-Suppression Bandwidth
Two Topologies of Balanced Dual-Band Bandpass Filters with Extended Common-Mode-Suppression Bandwidth
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DOI：
10.1109/rws.2019.8714386
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
R. Gómez‐García;J. Muñoz-Ferreras;W. Feng;D. Psychogiou
中科院分区：
文献类型：
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作者：
R. Gómez‐García;J. Muñoz-Ferreras;W. Feng;D. Psychogiou
报道了两种具有更大共模抑制带宽的全平面差模双频带通滤波器结构。第一种是针对宽间隔宽通带的设计，它利用了平衡对称平面上的额外线条的加载。因此，创建了多个共模传输零点(TZS)以扩大DB-BPF共模抑制范围。第二种可用于实现紧密间隔的通带，并采用适当平衡的准带通型DB-BPF拓扑。在这种情况下，通过为其谐振线路的短路端接(即，差模操作中的虚拟或物理短路)适当地选择实现类型来执行共模抑制带宽展宽。为了进行实验验证，制作了两个微带DB-BPF样机并进行了测试。
Two architectures of fully-planar differential-mode dual-band bandpass filters (DB-BPFs) with enlarged common-mode-suppression bandwidth are reported. The first one, which aims at designs with broadly-separated wide passbands, exploits the loading of extra lines in its balanced symmetry plane. Thus, multiple common-mode transmission zeros (TZs) are created to make wider the DB-BPF common-mode-rejection range. The second one can be used for realizations with closely-spaced passbands and employs a properly-balanced quasi-bandpass-type DB-BPF topology. In this case, the common-mode-mitigation bandwidth broadening is performed by adequately selecting the type of implementation for the short-circuit terminations of its resonating lines— i.e., virtual or physical short circuits in the differential-mode operation—. For experimental-validation purposes, two microstrip DB-BPF prototypes are manufactured and tested.