In order to suppress the interference of other wireless narrowband communication systems on ultra-wideband systems and improve the stopband suppression characteristics of ultra-wideband filters,an ultra-wide-band filter with wide stopband and three notches was proposed.The filter adopted the structure of traditional multi-mode resonator loaded step open circuit resonator and sector resonator to achieve ultra-wideband character-istics,and its resistance band width reached 24.3 GHz;in order to introduce three notches,the filter adopts loaded open circuit resonator,coupled L-type short-circuit stub and asymmetric coupling structure;In addition,the structure of the sector resonator was loaded by parallel open-circuit resonators,and the passband insertion loss was optimized.After electromagnetic simulation,the filter passband range was 4.1～11.28 GHz,the rela-tive bandwidth was 93.4％,the insertion loss was less than 1.3 dB,and the three notches were located at 5.1,6.28,8.1 GHz,and the notch depth was greater than 25 dB,which ensured the communication quality of ultra-wideband system.
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