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中文摘要：
随着通信产业的蓬勃发展,双频段无线通信系统对双频段滤波器的要求愈来愈高。实现滤波器的带宽和中心频率可控且保持良好的阻带特性一直是难以解决的问题。该文提出了一种采用枝节加载双模开环谐振器设计的微带双模双频段滤波器。该双模双频段滤波器是通过两个工作在不同频段的单频段双模滤波器并联而成的,因此滤波器两个频段的带宽和中心频率是独立可控的。在滤波器的设计中,采用延长耦合馈线的方法实现了过耦合,进而达到了抑制寄生通带的效果。最后,设计了一个工作在2.4/3.5 GHz的应用于无线通信领域的双频段带通滤波器,并对其进行了加工和测量。测量结果和仿真结果的良好吻合验证了设计理论的合理性。
英文摘要：
With the vigorous development of the communication industry, the demand of the dual-band wireless communication system with the dual-band bandpass filter （BPF） has rising more and more. Designing a dual-band BPF with controllable bandwidths central frequencies and good stopband performance has always been a difficult problem. This paper proposes a microstrip dual-band BPF by using stub-loaded dual-mode resonators. Two different single band BPFs are connected in parallel to design the dual-band BPF, so the bandwidths and central frequencies of it can be controlled separately. And coupled feed lines have been extended to achieve over coupling, then the spurious passband can be suppressed. Finally, a 2.4/3.5GHz dual-band BPF applied in the field of wireless communication has been designed, fabricated and measured. Good agreement between simulation and measurement has validated the design theory.
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