New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs
New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs
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DOI：
10.1109/tmtt.2010.2095031
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发表时间：
2011-03
影响因子：
4.3
通讯作者：
Kaixue Ma;K. Yeo
中科院分区：
文献类型：
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作者：
Kaixue Ma;K. Yeo
提出了一种利用径向短截线（TRS）实现超宽带抑制和小型化的低通滤波器。基于所提出的等效电路模型，研究了该滤波器的工作机理。所实现的LPF具有3 GHz的1 dB截止频率fc，其阻带抑制高达8 fc，即，24千兆赫。通过使用TRS产生多个零，可以实现高达-144 dB/倍频程的边缘选择性。测量的通带插入损耗小于1.5dB。I/O加载单元用于进一步将深阻带扩展到13 fc以上，40 GHz以上。在不使用集总元件的情况下，四单元低通滤波器的尺寸仅为0.31 λg × 0.24 λg（λg为中心截止频率处的波导波长）。
A new type of low-pass filter (LPF) with ultra-wide band rejection and compact size by using a proposed transformed radial stubs (TRSs) is introduced and investigated. The operating mechanism of the filter is investigated based on proposed equivalent-circuit model. The implemented LPF with 1-dB cutoff frequency fc of 3 GHz demonstrates stopband rejection up to 8 fc i.e., 24 GHz. The skirt selectivity is achieved up to -144 dB per octave through multiple-zero generation using TRSs. The measured passband insertion loss is less than 1.5 dB. I/O loading cells are used to further extend the deep stopband to more than 13 fc i.e., above 40 GHz. The size of the four-cell LPF is only 0.31 λg × 0.24 λg, (λg is the guide wavelength at center cutoff frequency) without using any lumped elements.