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7319458 
Journal Article 
Ultra-wideband bandpass filter with multiple notch-bands on multilayer liquid crystal polymer substrate 
Hao, ZC; Hong, JS; Alotaibi, SK; Parry, Q; Hand, JDP 
2009 
Yes 
I E T Microwaves, Antennas & Propagation
ISSN: 1751-8725 
3 
5 
749-756 
English 
WOS:000268003900005 
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. 
Broadside-coupled; Crystal polymer substrates; Federal Communications Commission; Full-wave simulations; Harmonic suppression; Lamination process; Measured results; Notch-band; Rejection levels; Stepped impedance resonator; Stopband performance; Ultra-wideband bandpass filters; Vector networks; Wide stopband; Wide-band; Automobile seats; Bandpass filters; Electric network analysis; Harmonic analysis; Light sources; Liquid crystal polymers; Liquid crystals; Metal cladding; Multilayers; Notch filters; Wireless telecommunication systems; Ultra-wideband (UWB)