Title :
An UWB Bandpass Filter Based on a Novel Type of Multi-Mode Resonator
Author :
Zhang, Zhongxun ; Xiao, Fei
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A novel type of multi-mode resonator (MMR) is proposed in this letter, which is constructed by cascading interdigital coupled microstrip line sections with short-ended stepped impedance stubs being loaded. Its transmission line model is set up and analyzed, which shows that it has seven resonances. Finally, an ultra-wideband filter based on this type of MMR is designed, fabricated and measured. The measured results show that the filter has a sharp skirt and an out-of-band rejection level as good as 40 dB. Meanwhile, return loss is better than 17 dB. Group delay is also flat in the passband.
Keywords :
band-pass filters; microstrip lines; resonator filters; MMR; UWB bandpass filter; group delay; interdigital coupled microstrip line; multimode resonator; return loss; short-ended stepped impedance stubs; transmission line model; ultra-wideband filter; Equivalent circuits; Filtering theory; Impedance; Resonant frequency; Transmission line measurements; Ultra wideband technology; Wireless communication; Multi-mode resonator (MMR); transmission zero; ultra-wideband (UWB) filter;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2012.2218229
