Ultra-wideband bandpass filter with multiple notch-bands on multilayer liquid crystal polymer substrate

Z. C. Hao, J. S. Hong, S. K. Alotaibi, J. P. Parry, D. P. Hand

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


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. © The Institution of Engineering and Technology 2009.

Original languageEnglish
Pages (from-to)749-756
Number of pages8
JournalIET Microwaves, Antennas and Propagation
Issue number5
Publication statusPublished - 2009


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