A dual‐functional substrate‐integrated waveguide (SIW) cavity which integrates a filter and two antennas is proposed in this article. Three slots are etched to divide a single cavity into four quarter‐mode subcavities. Two equal subcavities are utilized to design a second‐order filter. Mixed coupling is induced by this slot‐etched structure, where a controllable transmission zero can be generated in the lower or upper stopband. Two unequal subcavities are utilized to design two integrated antennas. By adjusting their areas, the frequency ratio of these two antennas achieves a wide range of 0.55‐1.81. In addition, the overall port isolation of higher than 21.0 dB is obtained by optimizing slot length. The proposed design has been validated by experimental results of a fabricated prototype. With advantages of low profile, light weight, suitable isolation, and flexible design, it has potential applications for modern wireless communication.

中文翻译：

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具有滤波器和天线集成的双功能基片集成波导腔的设计

本文提出了一种集成了滤波器和两个天线的双功能基片集成波导（SIW）腔。蚀刻了三个槽，以将单个腔分成四个四分之一模子腔。利用两个相等的子腔来设计二阶滤波器。缝隙刻蚀结构引起混合耦合，在该结构中可以在较低或较高的阻带中产生可控的零传输。利用两个不相等的子腔来设计两个集成天线。通过调整它们的面积，这两根天线的频率比可以达到0.55-1.81的宽范围。此外，通过优化插槽长度可以获得高于21.0 dB的总体端口隔离度。拟议的设计已通过制造原型的实验结果得到验证。外形小巧，重量轻，