A novel microstrip lowpass filter design using rectangular split-ring resonators with dual splits are designed, analysed, and fabricated with exceptional performance such as ultra-wide stopband and sharp roll-off rate along with its compactness. The symmetrical suppressing cells are also employed to reject higher-order harmonics from the stopband without affecting selectivity. The expression for transmission zero of dual split resonator-1 is extracted from the equivalent circuit analysis and observed the significance of coupling. A sharp roll-off performance of 224 dB/GHz and relative stopband width of 161% are achieved with a cut-off frequency of 2.9 GHz.

中文翻译：

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具有超宽阻带和陡峭滚降率的双分裂谐振器低通滤波器

设计，分析和制造了一种新颖的微带低通滤波器设计，该设计使用了具有双裂口的矩形裂环谐振器，并具有出色的性能，例如超宽的阻带和陡峭的滚降率以及其紧凑性。对称抑制单元还用于抑制阻带中的高次谐波，而不会影响选择性。从等效电路分析中提取了双分裂谐振器-1的零传输表达式，并观察了耦合的重要性。截止频率为2.9 GHz时，可实现224 dB / GHz的陡峭滚降性能和161％的相对阻带宽度。