A patch antenna coupling of a periodic leak-wave structure with tri-frequency capability is proposed. The periodic offset double-sided parallel stripline (DSPSL) leaky wave structure (LWS) is embedded in the direction of the whole ground of the microstrip patch substrate, then the capability of tri-frequency could be obtained by the different Floquet mode of the propagation constant. According to the design principle, a unified formula was derived to calculate the tri-frequency points at the same time. Though applying of antenna design principle and the simple tri-frequency formula, a tri-frequency patch antenna was designed and tested. Experiment results show that the antenna operated at 1.71, 2.05, and 2.72 GHz. The measured and calculated results show high consistency.

中文翻译：

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具有三频能力的周期性漏波结构的贴片天线耦合

提出了一种具有三频能力的周期性漏波结构的贴片天线耦合。将周期性偏移双面平行带状线（DSPSL）漏波结构（LWS）嵌入微带贴片基板的整个接地方向，然后通过不同的Floquet传播模式获得三频能力不变。根据设计原理，推导出一个统一的计算公式来同时计算三频点。应用天线设计原理和简单的三频公式，设计并测试了三频贴片天线。实验结果表明天线工作在 1.71、2.05 和 2.72 GHz。实测和计算结果具有较高的一致性。