Title :
A novel Ultra Wideband Bandpass Filter using Broadside Coupled Structures on Multilayer Organic Liquid Crystal Polymer Substrate
Author :
Hao, Zhang-Cheng ; Hong, Jia-Sheng ; Alotaibi, Sultan K.
Author_Institution :
Dept. of Electr., Heriot-Watt Univ., Edinburgh
Abstract :
This paper proposes a novel ultra wideband (UWB) bandpass filter using multilayer quasi-lumped structure on organic liquid crystal polymer (LCP) substrate. In this study, broadside coupled square patches and high impedance microstrip lines are adopted as quasi-lumped elements for realizing proposed filter. A 7-pole ultra wideband bandpass prototype is designed based on lump-element bandpass filter and verified by full-wave simulation. The designed BPF is fabricated using multilayer organic liquid crystal polymer (LCP) process and measured using vector network analyzer. Good agreement between simulated and measured responses is observed. The measurement results show that the fabricated filter has a fractional bandwidth of 118.75% and low insertion loss of 0.25 dB at centre frequency 6.4 GHz. The measured filter has wide stopband and excellent rejection level higher than 31.7 dB from 11.5 GHz to 17.20 GHz.
Keywords :
band-pass filters; liquid crystal polymers; microstrip filters; microstrip lines; microwave filters; broadside coupled structures; fractional bandwidth; frequency 11.5 GHz to 17.20 GHz; frequency 6.4 GHz; full-wave simulation; high impedance microstrip lines; insertion loss; lump-element bandpass filter; multilayer organic liquid crystal polymer substrate; ultrawideband bandpass filter; vector network analyzer; Band pass filters; Bandwidth; Frequency measurement; Impedance; Liquid crystal polymers; Loss measurement; Microstrip filters; Nonhomogeneous media; Ultra wideband technology; Virtual prototyping;
Conference_Titel :
Microwave Conference, 2008. EuMC 2008. 38th European
Conference_Location :
Amsterdam
Print_ISBN :
978-2-87487-006-4
DOI :
10.1109/EUMC.2008.4751624