In this study, a circular cross-coupled dielectric waveguide (DW) filter was realized based on 90-degree sectoral resonators. The filter is formed by splicing four 90-degree sectoral DW resonators (SDWRs). A shallow blind hole (BH) was set at the center of each 90-degree SDWR to adjust the resonant frequency. The magnetic coupling between the resonators was realized through the rectangular wall and shallow BH. Electrical coupling between the resonators was achieved through deep BHs. The overall structure was designed, simulated, and fabricated. The measured results demonstrate that the designed filter has a center frequency of 3.6 GHz, bandwidth of 200 MHz, insertion loss less than 1 dB, in-band return loss greater than 15 dB, and two out-of-band transmission zeros at 3.38 and 3.82 GHz.

中文翻译：

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基于90度扇形谐振器的圆形交叉耦合介质波导滤波器

在这项研究中，基于 90 度扇形谐振器实现了圆形交叉耦合介质波导 (DW) 滤波器。该滤波器由四个 90 度扇形 DW 谐振器 (SDWR) 拼接而成。在每个 90 度 SDWR 的中心设置一个浅盲孔 (BH) 以调整谐振频率。谐振器之间的磁耦合是通过矩形壁和浅 BH 实现的。谐振器之间的电耦合是通过深 BH 实现的。整体结构经过设计、模拟和制造。实测结果表明，所设计的滤波器中心频率为3.6 GHz，带宽为200 MHz，插入损耗小于1 dB，带内回波损耗大于15 dB，在3.38和3.38处有两个带外传输零点。 3.82 GHz。