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针对传统耦合结构的双模微带滤波器端口耦合度受限于加工精度及存在二次寄生通带等问题,提出了一种新型双模滤波器。该滤波器采用弯折偏移馈电型的耦合结构,结合阶跃阻抗双模谐振器,能够在提高端口耦合度的同时有效抑制谐波响应。在此基础上,针对级联双模滤波器的近边带杂散问题,通过分析杂散响应频点变化规律和模式电流分布,并利用该新型滤波器自身传输零点可控的特性,优化寄生谐振器的结构参数,有效抑制了近边带杂散响应。仿真和实验表明,与传统双模滤波器相比,该设计具有插入损耗低、过渡带陡峭、阻带宽的特性,在宽带通信中的杂散抑制方面具有较好的应用价值。
Aiming at the problems that the coupling degree of the dual-mode microstrip filter with traditional coupling structure is limited by the machining accuracy and the secondary parasitic passband, a new type of dual-mode filter is proposed. The filter adopts a bending bias feed-type coupling structure and a step impedance dual-mode resonator, which can effectively suppress the harmonic response while improving the port coupling degree. Based on this, aiming at the near-sideband spurious problem of cascaded dual-mode filter, by analyzing the change rule of frequency of spurious response and the mode current distribution, the novel filter is used to control the zero-point controllable characteristics and optimize parasitic The structural parameters of the resonator effectively suppress the near-side band spurious response. The simulation and experiment show that the proposed scheme has the characteristics of low insertion loss, steep transition band and wideband stopband compared with the traditional dual-mode filter, and has good application value in spurious suppression in wideband communication.