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Miniaturized SIW Cavity Tri-Band Filter Design
IEEE Microwave and Wireless Components Letters ( IF 3 ) Pub Date : 2020-06-01 , DOI: 10.1109/lmwc.2020.2987172
Min-Hua Ho , Kun-Hua Tang

This letter presents a novel tri-band filter design using an ultraminiaturized substrate-integrated waveguide (SIW) cavity operated at evanescent mode. Two miniaturized SIW cavities in a face-to-face form are vertically stacked to build the proposed tri-band filter. The top and bottom metal layers form the cavity’s broadside walls, and the middle layer possesses three identical patches which are formed by evenly trisecting a circular patch. These patches are shorted to the cavity’s bottom wall through one, two, or four via-holes. The patches together with the host cavity exhibit three frequency-distinct resonances that create the filter’s triple passbands. The resonance frequencies are independently controlled, and six passband-edge transmission zeros are created for good selectivity. The filter size is only $0.22\,\,\lambda _{d} \times 0.22\,\,\lambda _{d}$ , and the measured in-band minimum insertion losses are 2.31, 2.25, and 3.01 dB for the first, second, and third bands, respectively. It is believed that the proposed tri-band filter has obtained the best circuit area efficiency in the SIW tri-band filter category.

中文翻译:

小型化 SIW 腔三频滤波器设计

这封信提出了一种新颖的三频滤波器设计,该设计使用在渐消模式下运行的超小型基板集成波导 (SIW) 腔。两个面对面的小型化 SIW 腔垂直堆叠以构建建议的三频滤波器。顶部和底部金属层形成腔体的宽侧壁,中间层具有三个相同的贴片,它们由圆形贴片均匀地三等分形成。这些贴片通过一个、两个或四个通孔与空腔的底壁短路。贴片与主腔一起表现出三个不同频率的共振,产生滤波器的三通带。谐振频率是独立控制的,并且创建了六个通带边缘传输零点以实现良好的选择性。过滤器尺寸仅为 $0.22\,\,\lambda _{d} \times 0.22\,\, λ _{d}$ ,测得的带内最小插入损耗分别为第一、第二和第三频段的 2.31、2.25 和 3.01 dB。相信所提出的三频滤波器在 SIW 三频滤波器类别中获得了最佳的电路面积效率。
更新日期:2020-06-01
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