基片集成波导双频段可调滤波器设计

Design of Dual-band Tunable Filter Based on Substrate Integrated Waveguide

根据基片集成波导谐振腔微扰原理,设计了一种基片集成波导双频带可调滤波器。通过在基片集成波导谐振腔中插入不同数量的金属铜柱,对电场进行微扰,实现滤波器四个状态可调。滤波器的第一通带由TE101模谐振产生,第二通带由TE102和TE201模谐振产生。为了验证设计的有效性,对可调滤波器进行加工与测试,实测滤波器的中心频率可以在5.25/8.25 GHz、6.40/8.32 GHz、7.90/8.95 GHz、8.20/9.20 GHz变化,插入损耗为-2.1^-3.8 dB,回波损耗小于-10 dB,满足设计要求。该滤波器具有易调谐、与其他平面电路易集成等优势。

According to the principle of substrate integrated waveguide(SIW)resonator perturbation,a SIW dual-band tunable filter was designed. The four states of the filter were adjusted by inserting different numbers of metal copper columns into the SIW cavity to perturb the electric field. The first passband of the filter was generated by TE101 mode resonance,and the second passband was generated by TE102 and TE201 modes resonance. In order to verify the validity of the design,the SIW dualband tunable filter was fabricated and measured. The center frequency of the tunable filter can be changed at 5.25/8.25 GHz,6.40/8.32 GHz,7.90/8.95 GHz,8.20/9.20 GHz. The insertion loss is from-2.1 dB to-3.8 dB,the return loss was less than-10 dB.The filter has the advantages of easy tuning and integration with other planar circuits,etc.