In this letter, the stacked dual-slotted substrate integrated cavities (SICs) are proposed to achieve a filtering antenna. The dual-slotted SIC shows dual-mode behavior (quasi-dual-slot mode and quasi-cavity mode), which can achieve multiorder response with fewer SICs. Furthermore, the antenna exists at two frequencies at which the electric field has opposite horizontal component ($E_{x}$) near each slot. Thus, two radiation nulls can be obtained to enhance the frequency selectivity. The frequencies of the radiation nulls and the dual modes can both be controlled to some extent by the distance between the slots. For demonstration, a prototype at 9.65 GHz is designed with the fractional bandwidth of 9.1%, the gain of 7.2 dBi, and the frequency selectivity of 0.70.

中文翻译：

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一种使用堆叠双槽基板集成腔的具有高频选择性的滤波天线

在这封信中，提出了堆叠双槽基板集成腔（SIC）来实现滤波天线。双槽SIC表现出双模式行为（准双槽模式和准腔模式），可以用更少的SIC实现多阶响应。此外，天线存在于两个频率处，其中电场在每个缝隙附近具有相反的水平分量 ($E_{x}$)。因此，可以获得两个辐射零点以提高频率选择性。辐射零点和双模的频率都可以在一定程度上通过缝隙之间的距离来控制。为了演示，设计了一个 9.65 GHz 的原型，其部分带宽为 9.1%，增益为 7.2 dBi，频率选择性为 0.70。