In this work, the concept of high-order space harmonics (HSHs) applied to a hybrid form of nonradiative dielectric (NRD) waveguide and substrate-integrated square waveguide (SIW) involving both TE10 and TE01 modes is investigated with aim to develop multi-functional dually polarized leaky-wave antennas (DP-LWAs). A polarization-selective coupling (PSC) mechanism is used to guide the two orthogonally oriented modes in the hybrid structure to achieve a polarization diversity feature. The polarization effect on unit-cell geometrical structures is examined for different characteristics of LWA such as propagation constant behavior, leakage ratio, and scanning range variation. In addition, we demonstrate how the extrinsic characteristics of HSHs in a one-dimensional periodic LWA and its unit-cell analysis can provide design flexibility through two case studies. In the first case of demonstration, we show a dually polarized multi-beam LWA design with wide scanning capability in which we use both even and odd HSHs of n $\mathrm {\epsilon }$ [−1, −2]). The second antenna design case is concerned with a DP-LWA having the capability of fixed and scanning beams operation by using a combinatory set of PSC and four HSHs of n $\mathrm {\epsilon }$ [−1, −2, −3, −4]. Two DP-LWA prototypes are demonstrated as proofs of concept, and the obtained experimental results show a very good agreement with their simulation and analysis counterparts.

中文翻译：

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具有固定和扫描波束能力的单层双极化高阶空间谐波漏波 SIW 天线

在这项工作中，研究了应用于 TE10 和 TE01 模式的非辐射电介质 (NRD) 波导和衬底集成方形波导 (SIW) 混合形式的高阶空间谐波 (HSH) 的概念，旨在开发多模功能性双极化漏波天线 (DP-LWA)。偏振选择耦合（PSC）机制用于引导混合结构中的两个正交取向模式，以实现偏振分集特性。针对 LWA 的不同特性（例如传播常数行为、泄漏比和扫描范围变化）检查了对晶胞几何结构的极化效应。此外，我们通过两个案例研究展示了一维周期性 LWA 中 HSH 的外在特性及其晶胞分析如何提供设计灵活性。在第一个演示案例中，我们展示了具有宽扫描能力的双偏振多光束 LWA 设计，其中我们使用 n 的偶数和奇数 HSH $\mathrm {\epsilon }$[-1，-2]）。第二个天线设计案例涉及具有固定和扫描波束操作能力的 DP-LWA，它使用一组 PSC 和 n 个的四个 HSH $\mathrm {\epsilon }$[-1，-2，-3，-4]。演示了两个 DP-LWA 原型作为概念证明，所获得的实验结果与它们的模拟和分析对应物显示出非常好的一致性。