In this paper, a compact novel simple design of ultra‐wide bandpass filter with high out of band attenuation is presented. The filter configuration is based on combining an ultra‐wide band composite right/left‐handed (CRLH) band pass filter (BPF) with simple uni‐planar configuration of complementary split ring resonator (UP‐CSRR). By integrating two UP‐CSRR cells, the ultra‐wideband CRLH filter roll‐off and wide stopband attenuation are enhanced. The filter has 3 dB cutoff frequencies at 3.1 GHz and 10.6 GHz with insertion loss equals 0.7 dB in average and minimum and maximum values of 0.48 dB and 1.05 dB, respectively over the filter passband. Within the passband. The transition band attenuation from 3 dB to 20 dB is achieved within the frequency band 1.9 GHz to 3.1 GHz (48%) at lower cutoff and the frequency band 10.6 GHz to 11.4 GHz (7%) at upper stopband. Moreover, the filter has a wide stopband attenuation >20 dB in frequencies 11 GHz to 13.6 GHz (21%) and ends with 3 dB cutoff frequency at 14.8 GHz. Furthermore, the designed filter size is very compact (23 × 12 mm²) whose length is only about 0.17 λ_g at 6.85 GHz. The filter performance is examined using circuit modeling, full‐wave simulations, and experimental measurements with good matching between all of them.

中文翻译：

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互补开口环谐振器基于右/左手的复合带通滤波器的超宽带单平面配置的新颖配置，具有陡峭的滚降和良好的阻带衰减

本文提出了一种紧凑的新型简单设计，具有高带外衰减的超宽带通滤波器。滤波器配置基于将超宽带复合右/左手（CRLH）带通滤波器（BPF）与互补开口环谐振器（UP-CSRR）的简单单平面配置相结合的基础。通过集成两个UP-CSRR单元，超宽带CRLH滤波器的滚降和宽阻带衰减得以增强。该滤波器在3.1 GHz和10.6 GHz处具有3 dB的截止频率，在滤波器通带上，插入损耗的平均值分别为0.7 dB和0.48 dB和1.05 dB的最小值和最大值。在通带内。从1.9 GHz到3.1 GHz（48％）的频段在较低的截止频率和10.6 GHz到11的频段内实现了从3 dB到20 dB的过渡带衰减。较高的阻带为4 GHz（7％）。此外，该滤波器在11 GHz至13.6 GHz的频率中具有大于20 dB的宽阻带衰减（21％），并在14.8 GHz处具有3 dB截止频率。此外，设计的过滤器尺寸非常紧凑（23×12毫米²），其长度只有约0.17  λ_克在6.85千兆赫。使用电路建模，全波仿真和实验测量对滤波器性能进行了检查，并且它们之间都具有良好的匹配性。