Inline Quasi-Elliptic Bandpass Filter Based on Metal 3-D Printing Technology
Inline Quasi-Elliptic Bandpass Filter Based on Metal 3-D Printing Technology
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DOI：
10.1109/tmtt.2022.3144275
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发表时间：
2022-04
影响因子：
4.3
通讯作者：
Jiayu Rao;K. Nai;J. Marqués-Hueso;Povilas Vaitukaitis;Jiasheng Hong
中科院分区：
文献类型：
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作者：
Jiayu Rao;K. Nai;J. Marqués-Hueso;Povilas Vaitukaitis;Jiasheng Hong
本文提出了一种新型的波导加载空气槽谐振器(WLASR)，它由周围的金属盒和带有刻蚀空气槽的插入金属盘组成。所提出的WLASR具有与同轴谐振器相当的空载品质因数(Q{\mathm{u}})，并且允许分别控制电耦合和磁耦合。利用这些吸引人的特性，首次设计了一个中心频率为2.82 GHz、分数带宽为6.73%、两个可控传输零点(TZS)分别位于2.65 GHz和2.98 GHz的四极直列式电磁混合耦合带通滤波器。利用直接金属三维打印技术制作了样机。对于第一个演示的3-D打印样机来说，测量结果是吉祥的。因此，设计了两个具有多个TZS、尺寸更紧凑、Q值更高、形状更好的六极点滤波器。为了进行实验验证，其中一份只打印了两件。测量结果与模拟结果吻合较好。
This article presents a novel waveguide loaded air slots’ resonator (WLASR) comprised of a surrounding metal box and inserted metal disk with etched air slots. The proposed WLASR exhibits a comparable unloaded quality factor ( $Q_{\mathrm {u}}$ ) to the coaxial resonator and allows controlling the electric and magnetic couplings separately. These attractive characteristics were first deployed to design a four-pole inline electrical–magnetic mixed-coupling bandpass filter centered at 2.82 GHz with a fractional bandwidth of 6.73% and two controllable transmission zeros (TZs) located at 2.65 and 2.98 GHz, respectively. Direct metal 3-D printing technology was utilized to manufacture the prototype. The measured results were auspicious for the first demonstrated 3-D printed prototype. Hence, two six-pole filters with multiple TZs, more compact sizes, higher $Q_{\mathrm {u}}$ , and improved shape were designed. For experimental validation, one of them was printed with only two pieces. The measured results agreed well with the simulated ones.