In this letter, a compact wideband bandpass filter (BPF) with a wide stopband is proposed based on the substrate integrated defected ground structure (SIDGS) and folded stepped-impedance resonator (FSIR). Such a SIDGS resonator can not only allocate a specific resonance with compact size but also introduce the different harmonic positions compared with a traditional microstrip line resonator. Meanwhile, due to the discrepant harmonic positions of proposed SIDGS and FSIR, a wide stopband response can be achieved using a compact stacked-coupled scheme. To verify the mechanism, a miniaturized wideband BPF operating at 1.69 GHz (i.e., $f_{0}$ ) is implemented and fabricated. A measured wide stopband up to 11.8 $f_{0}$ with a 20-dB rejection level is achieved.

中文翻译：

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采用基片集成缺陷接地结构的，具有宽阻带的紧凑型宽带BPF

在这封信中，基于基片集成缺陷接地结构（SIDGS）和折叠式步进阻抗谐振器（FSIR），提出了一种具有宽阻带的紧凑型宽带带通滤波器（BPF）。与传统的微带线谐振器相比，这种SIDGS谐振器不仅可以分配具有紧凑尺寸的特定谐振，而且可以引入不同的谐波位置。同时，由于建议的SIDGS和FSIR的谐波位置不同，使用紧凑的堆叠耦合方案可以实现宽阻带响应。为了验证该机制，采用了工作在1.69 GHz的小型宽带BPF（即， $ f_ {0} $ ）的实施和捏造。测得的宽阻带高达11.8 $ f_ {0} $ 达到20 dB的抑制水平。