基于QMSIW小型化带通滤波器设计

为有效减小X波段基片集成波导(SIW)滤波器的尺寸和插入损耗,提出了基于四分之一模基片集成波导(QMSIW)和共面波导(CPW)混合结构的小型化带通滤波器。为了提高滤波器的选择性和带外抑制,将两个CPW合并到两个级联的QMSIW谐振器中,由于两个CPW谐振器之间的耦合是电耦合,有助于产生两个传输零点,因而具有较高的选择性。该小型化滤波器尺寸仅为8.1 mm×15.4 mm,中心频率为8.7 GHz,相对带宽是16.1%,仿真测得插入损耗为0.83 dB,带外抑制大于40 dB。

Design of Miniaturized Bandpass Filter Based on QMSIW

In order to effectively reduce the size and insertion loss of the X-band substrate integrated waveguide(SIW) filter, a quarter-mode substrate integrated waveguide(QMSIW) and a total of miniaturized bandpass filter for coplanar waveguide(CPW) hybrid structure. In order to improve the selectivity and out-of-band rejection of the filter, the two CPWs are combined into two cascaded QMSIW resonators. Since the coupling between the two CPW resonators is electrically coupled, it helps to generate two transmission zeros. And thus have a higher selectivity. The miniaturized filter measures only 8.1 mm×15.4 mm with a center frequency of 8.7 GHz and a relative bandwidth of 16.1%. The simulation measures an insertion loss of 0.83 dB and an out-of-band rejection of more than 40 dB.