A compact ultra-wideband microstrip bandpass filter was designed and fabricated, which was composed of a microstrip low-pass filter and two pair of minor lines that included a quarter wavelength SIR resonator and a quarter wavelength short end resonator. The filter was simulated by using ADS software, and was fabricated. Results show that the filter’s relative bandwidth reaches 112%, the stopband bandwidth is more than 4 GHz, the insertion loss is less than 1 dB and the return loss is more than 10 dB in passband range, and the stopband return loss is greater than 20 dB. The filter size is 14.22 mm × 9.65 mm.%设计制作了一种紧凑型超宽带微带带通滤波器。该滤波器采用两对由1/4波长型SIR谐振器和1/4波长终端短路谐振器构成的枝节线对与微带低通滤波器相联而成。在 ADS 软件上对该滤波器进行仿真验证，然后制作实物。结果表明，该滤波器相对带宽达到112%，阻带带宽超过4 GHz，通带范围内插入损耗小于1 dB，回波损耗大于10 dB，阻带范围回波损耗大于20 dB；滤波器尺寸为14.22 mm ×9.65 mm。
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