CAJ | 학술논문

提出了一种基于多模谐振器的新型三通带滤波器.该滤波器由一个多模谐振器和一对馈线构成，多模谐振器结构具有对称性.利用奇偶模理论分析了该结构的谐振特性.该结构6个谐振模式的频率都可以由对应的物理尺寸自由调节；所有谐振模式的等效电路均为1/4波长谐振器，有效地减小了滤波器的尺寸，实现了小型化.同时，一次谐波出现在三倍频处，使得滤波器拥有良好的带外选择特性.在结构中引入枝节之间的耦合，不仅分离了重合的谐振模式，也形成了两个新的传输零点，进一步提高了通带之间的隔离度.最后设计并加工了一款工作于1.5 GHz/2.4 GHz/3.5 GHz的三通带滤波器，测试与仿真结果吻合良好.
제출료일충기우다모해진기적신형삼통대려파기.해려파기유일개다모해진기화일대궤선구성，다모해진기결구구유대칭성.이용기우모이론분석료해결구적해진특성.해결구6개해진모식적빈솔도가이유대응적물리척촌자유조절；소유해진모식적등효전로균위1/4파장해진기，유효지감소료려파기적척촌，실현료소형화.동시，일차해파출현재삼배빈처，사득려파기옹유량호적대외선택특성.재결구중인입지절지간적우합，불부분리료중합적해진모식，야형성료량개신적전수영점，진일보제고료통대지간적격리도.최후설계병가공료일관공작우1.5 GHz/2.4 GHz/3.5 GHz적삼통대려파기，측시여방진결과문합량호.
A compact tri-band microstrip filter based on an MMR(multiple mode resonator)is presented, which consists of an MMR and a pair of feedlines.Firstly,due to the symmetry of the structure,the even-odd-mode method is applied twice to analysis the resonant characteristics.All the six mode frequencies can be freely tuned by changing the lengths of loaded stubs,and all the four modes equivalent circuits are quarter-wavelength resonators,which largely minimize the size of the filter.Secondly,stub to stub coupling is introduced to split two modes and produce two new transmission zeros with the passband selectivity improved.Finally,a microstrip tri-band bandpass filter(BPF)operating at 1.5 GHz/2.4 GHz/3.5 GHz is designed,fabricated and measured.Measured results are in good agreement with the simulated ones.