A Compact UWB Bandpass Filter With Improved Upper-Stopband Performance
A compact microstrip-line ultra-wideband (UWB)bandpass filter (BPF) using a multiple-mode resonator (MMR) is presented.This MMR consists of a folded stepped-impedance resonator (FSIR) and three open-ended stubsInshunt to it.Inthe design,the first four resonant frequencies of this MMR are properly adjusted to be placed evenly within the UWB while the fifth resonant frequency is raised above 16.0 GHz. Then the combination of capacitive-ended interdigital coupled lines and backside-apertures at two sides,by which the tight line spacing is greatly relaxed,are used to raise the coupling degree with the coupling peak near the center of the UWB and create an transmission zero to cancel the fifth resonant mode of the MMR to make a wide upper-stopband. After optimization of this filter,a good UWB bandpass behavior is theoretically realized and experimentally confirmed.The results shows that the insertion loss is higher than 20 dBInthe upper-stopband (11.7-19.0 GHz).and the bandwidth is 3.3-10.7GHz.
Folded stepped-impedance resonator (FSIR) interdigitai parallel-coupled line backside-apertures open-endedstub ultra-wideband (UWB) bandpass filter (BPF) wide upper-stopband
Shu-Tao Li Qing-Xin Chu
School of Electronic and Information Engineering,South China University of Technology, School of Electronic and Information Engineering,South China University of Technology
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
363-365
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）