Novel Wideband Differential Bandpass Filters Based on T-Shaped Structure

Novel Wideband Differential Bandpass Filters Based on T-Shaped Structure
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基于T形结构的新型宽带差分带通滤波器

DOI:
10.1109/tmtt.2012.2188538
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发表时间:
2012-03
影响因子:
4.3
通讯作者:
Che, Wenquan
Che, Wenquan
中科院分区:
工程技术1区
文献类型:
--
作者:
Feng, Wenjie;Che, Wenquan

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提出了两种基于T形结构的宽带差分带通滤波器。由于短路/开路T形结构的谐振器频率受控,对于没有交叉耦合的宽带差分滤波器,可以容易地实现对差分/共模的宽带通带和宽带谐波抑制。此外,另一个更紧凑的差分滤波器使用交叉耦合提出了两个传输零点接近通带,以提高对差分模式的选择性。为了验证所提出的概念,两个原型(εr = 2.65,h = 0.5 mm)的3dB的部分带宽为70%和70.7%的差模和插入损耗大于13.5 dB的共模(0-19 GHz)的设计和制造。测量结果与理论预期之间可以观察到良好的一致性。
Two novel wideband differential bandpass filters based on a T-shaped structure are proposed in this paper. Broad passband and wideband harmonic suppression for the differential/common mode can be easily achieved for the wideband differential filter without cross coupling, due to the controlled resonator frequencies of the shorted/open T-shaped structure. In addition, another more compact differential filter using cross coupling is proposed with two transmission zeros close to the passband to improve the selectivity for the differential mode. To verify the presented concept, two prototypes (εr = 2.65, h = 0.5 mm) with 3-dB fractional bandwidth of 70% and 70.7% for the differential mode and insertion loss greater than 13.5 dB for common mode (0-19 GHz) are designed and fabricated. Good agreement can be observed between measured results and theoretical expectations.
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