Compact UWB Bandpass Filter on Hybrid Microstrip/S lotline Structure with Improved Out-of-Band Performances
A compact ultra-wideband(UWB) bandpass filter with good in-band and out-of-band performances is proposed and implemented on hybrid microstriP/slotline structure．A multiple-mode slotHne resonator with stepped-impedance configuration is first properly constructed,aiming to allocate its first three resonances occurring at desired positions within the UVB passband.Two 50 Ω microstrip feed lines are then placed perpendicular to this slotline resonator on the opposite side of the substrate．As a result．an initiaI back-to-back microstrip-slotline bandpass filter is consfituted with the targeted UWB passband.Later the slotline resonator is twisted and an additional coupling between two open-ends of feed lines is introduced,resulting inminiaturizing its overall circuitry size and enhancing the roll-off skirts out of the passband．In final,defected ground structures (DGSs)are formed on the two feed Iines to improve the upper stopband performance．TWO UWB bandpass mters are designed.fabricated and measured．Measured results demonstrate an UWB passband from 3.25 to 10.21 GHz with in-band return loss >10.43 dB and group delay variation<0.34 ns.
Rui Li Lei Zhu
School of Electrical and Electronic Engineering Nanyang Technological University,Singapore 639798
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
6-9
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）