On account of the high order resonant frequencies in bandpass filter design, the common methods adopted to achieve the spurious suppression are to add open stubs on the input and output feeding lines, based on which, two different stepped impedance open loop resonators loaded by open stubs on the middle are used to realize the separation and suppression of the high order resonant frequencies and achieve wide stopband in this paper. The simulation by HFSS and the measurement of fabricated prototype based on the proposed topology demonstrate the designed filter available and can be applicated in spurious suppression.%针对带通滤波器的高次谐波干扰,结合目前常用的在输入输出微带馈线上添加开路线构成带阻的方法,采用两个互异的中间添加开路线的阶跃阻抗开环谐振器来实现高次谐振频点的相互分离,达到抑制高次谐波实现宽阻带的目的.通过仿真软件对这一方案的验证及网络分析仪的实物测试证明,该方案具有良好的效果,能广泛应用于带通滤波器的谐波抑制.
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