中文摘要：

针对高性能射频滤波器结构复杂、尺寸大的问题．基于阶梯阻抗谐振器设计制作了一个中心频率为2．45GHZ的小型发夹型微带带通滤波器。通过把半波长阶梯阻抗谐振器耦合结构折合成“U”字形，即发夹型结构改善了滤波器性能和缩小了滤波电路尺寸。通过软件仿真和对制作的硬件电路测试的结果表明，设计制作的滤波器在2．42GHZ到2．48GHz范围内的插入损耗小于2dB，3dB带宽为130MHz，中心频率的回波损耗达到了30dB，直流到2GHZ以及2．8GHz到11GHz频率范围的阻带衰减都大于了30dB。因此，该滤波器有效地抑制了寄生通带，而且结构简单、尺寸也小于26mm×22mm。

英文摘要：

Because of high performance filters＇ complicated structure and big dimension, a microstrip bandpass filter centered at 2.45 GHz is designed and developed based on stepp sonator （SIR）. The performance of the filter is improved and the dimension is reduced by wavelength SIRs coupling structure to ＇U＇ shape, which is hairpin. The results of simulat compact hairpin ed impedance rekinking the half ion and measurement of the PCB demonstrate that the insert loss is less than 2 dB in the frequency domain from 2.42 to 2.48 GHz, the 3 dB bandwidth is 130 MHz, the return loss in the middle frequency is as high as 30 dB, and the stop band suppression is bigger than 30 dB in the frequency domain from DC to 2 and 2.8 to 11 GHz. It can be seen that this filter not only suppresses the spurious band effectively, but also have simple and small structure with dimension smaller than 26 mm × 22 mm.