Ultra-wideband bandpass filter with multiple notch-bands on multilayer liquid crystal polymer substrate
Ultra-wideband bandpass filter with multiple notch-bands on multilayer liquid crystal polymer substrate
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DOI：
10.1049/iet-map.2008.0232
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发表时间：
2009-08-01
影响因子：
1.7
通讯作者：
Hand, D. P.
中科院分区：
文献类型：
--
作者：
Hao, Z. -C.;Hong, J. -S.;Hand, D. P.
提出了一种新颖的紧凑型超宽带(UWB)带通滤波器(BPF)，它具有单或多个陷波频带，以避免现有无线电系统的干扰。提出并设计了一种基于宽边耦合阶跃阻抗谐振器(SIRS)的紧凑型超宽带带通滤波器，通过在宽边耦合阶跃阻抗谐振器(SIRS)中嵌入开路短节来产生陷波带。由于SIRS的谐波抑制特性，所提出的超宽带带通滤波器具有较宽的阻带和较高的抑制电平。通过全波模拟研究了该凹槽结构的特性。采用多层液晶聚合物(LCP)技术实现了所设计的超宽带BPF。在实验中，首先设计了满足联邦通信委员会规定的室内限值的具有优良阻带性能的超宽带带通滤波器，然后设计了单带、双带和三带陷波带的超宽带带通滤波器，以展示所提出的滤波器具有灵活的陷波带宽、高选择性和宽带谐波抑制性能。所设计的BPF是通过多层LCP叠层工艺制造的，并使用矢量网络分析仪进行了测试。计算结果与实测值吻合较好。
Novel compact ultra-wideband (UWB) bandpass filters (BPFs) with single or multiple notch-bands to avoid interference from existing radio systems are presented. A compact UWB BPF is proposed and designed based on broadside-coupled stepped impedance resonators (SIRs) at first, and then notch-bands are generated by embedding open-circuit stubs into broadside-coupled SIRs. Because of the harmonic suppression behaviour of SIRs, the proposed UWB BPFs have a wide stopband and high rejection level. The characteristic of the proposed notch-structure was investigated by full-wave simulations. Multilayer liquid crystal polymer (LCP) technology was used to implement the designed UWB BPFs. In the experiments, a UWB BPF with excellent stopband performance was designed to meet the Federal communications commission-defined indoor limits at first, and then UWB BPFs with single, double and triple notch-bands were designed to demonstrate the flexible notch-band, high-selectivity and wideband harmonic suppression performances of the proposed filter. The designed BPFs were fabricated by a multilayer LCP lamination process and measured using a vector network analyser. Good agreement between the predicted and measured results was obtained as presented here.