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采用修改的多模谐振器(MMR)结构,在输入端与输出端开槽形成交叉耦合,实现了一种结构紧凑、频率选择性较高的超宽带(UWB)带通滤波器.修改的多模谐振器能产生5个模式和2个在高低截止频率附近的传输零点,提高了频率选择性.在滤波器的基础上,通过加载谐振器,形成在8.11 GHz处具有陷波特性的超宽带带通滤波器.利用HFSS13.0验证设计原理.仿真结果表明,该超宽带带通滤波器通带为2.61～11.21 GHz,陷波频率为8.11 GHz,能有效抑制X频段(7.91～8.31 GHz)卫星通信系统对超宽带通信系统的影响,适用于超宽带无线通信系统.“,”An ultra wideband (UWB) bandpass filter with compact structure and high frequency selectivity was realized by using the modified multimode resonator (MMR) structure to form the cross coupling through the input and output slot.The modified multimode resonator generated five modes and two zero transmission points near the high and low cutoff frequencies,which had increased the frequency selectivity.And on the basis of the filter,an ultra-wideband bandpass filter with notch bands at 8.11 GHz was formed through the load resonator.It was verified by the HFSS13.0.The simulation results showed that the passband of the proposed ultra wideband bandpass filter was 2.61～11.21 GHz,and the notch frequency was 8.11 GHz,which could effectively suppress the influences of X-band (7.91～8.31 GHz) satellite communication systems on the ultra wideband communication systems.It was suitable for the applications of ultra wideband wireless communication systems.