Symmetrical Quasi-Absorptive RF Bandpass Filters
Symmetrical Quasi-Absorptive RF Bandpass Filters
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DOI：
10.1109/tmtt.2019.2895531
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发表时间：
2019-04-01
影响因子：
4.3
通讯作者：
Psychogiou, Dimitra
中科院分区：
文献类型：
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作者：
Gomez-Garcia, Roberto;Munoz-Ferreras, Jose-Maria;Psychogiou, Dimitra
提出了一种具有准吸收功能的对称射频带通滤波器。它们由一个带通部分组成，该带通部分在其输入/输出端口处加载有几乎互补的反向终止的带阻部分。以这种方式，没有被带通部分传输的输入信号能量被带阻部分的负载电阻器耗散，以获得准无反射行为。对一阶对称准吸收带通滤波器级进行了详细的理论分析。此外，更高的衰减和更尖锐的抑制设计的基础上，在串联级联安排，高阶实现和交叉耦合技术的合成示例进行说明。对所设计的对称准无反射带通滤波器结构进行了均匀和非均匀Q分布的耦合矩阵级损耗分析。此外，为实验验证，2.5 GHz微带带通滤波器示威者组成的带内线性相位两级串联级联电路和二阶原型的制造和特点。
A type of symmetrical RF bandpass filters (BPFs) with quasi-absorptive functionality are presented. They are composed of a bandpass section that is loaded at its input/output ports with nearly complementary resistively terminated band-stop sections. In this manner, the input-signal energy that is not transmitted by the bandpass section is dissipated by the loading resistors of the bandstop sections to attain the quasi-reflectionless behavior. The theoretical analysis of the first-order symmetrical quasi-absorptive BPF stage is detailed. In addition, synthesis examples of higher attenuation and sharper rejection designs based on in-series-cascade arrangements, higher order realizations, and cross-coupling techniques are illustrated. A coupling-matrix-level loss analysis of the devised symmetrical quasi-reflectionless BPF configuration for uniform and nonuniform quality-factor (Q) distribution is also carried out. Furthermore, for experimental validation, 2.5-GHz microstrip BPF demonstrators consisting of an in-band linear-phase two-stage in-series-cascade circuit and a second-order prototype are manufactured and characterized.