双模谐振器设计超宽带滤波器

利用双模谐振器设计一个结构新颖紧凑的超宽带(UWB)滤波器,该滤波器的通带为3.9~11.6 GHz，通带最低频率(FBW)达99%.两个衰减极点分别产生在靠近通带的两边,提高了通带频率的选择性.另外两个衰减极点产生在通带高频端的阻带内,抑制双模谐振器二次谐振产生的谐振模式,很好地改进了阻带性能.仿真和测量结果表明,通带内插入损耗低于1.0 dB(3.9~11.6 GHz),高阻带内插入损耗大于15.0 dB (12.0~19.5 GHz),整个通带内群延迟小于0.5 ns.仿真和测量结果很好地吻合,表明此超宽带滤波器的有效性.

Design of Ultra-Wideband Filter with Dual-Mode Resonator

An ultra-wideband (UWB) filter with a novel compact structure using dual-mode resonators is proposed.The passband ranges from 3.9～11.6 GHz,achieving about 99% fractional bandwidth (FBW).Two sharp attenuation poles can be located close to either side of the desired pass-band to improve the frequency selectivity.The other two attenuation poles can be set in the stopband of upper frequencies so as to reject the third resonant modes of dual-mode resonators.The measured results demonstrate that the insertion loss is below 1.0 Db in the passband,and higher than 15.0 Db in the upper- stopband (12.0～19.5 GHz).Group delay variation in the passband is less than 0.5 ns.The measured result agrees well with the electromagnetic (EM) simulated result,demonstrating validity of the filter.