A new dual-polarized antenna and array are presented for In-Band Full-Duplex (IBFD) applications, offering high inter-port isolation. The single-element antenna system consists of four H-shape slots, stacked patches for wide bandwidth, and two external hybrid couplers. The multilayer antenna is well matched from about 2.1 to 2.4 GHz and provides high isolation in this frequency range in excess of 60 dB. Two different prototypes are simulated and measured to highlight the design process. In addition, a new and compact hybrid coupler with excellent phase and magnitude stability is also presented for improved antenna radiation and IBFD performances. When compared to other similar types of hybrid coupler and antenna systems, the proposed configurations are simple to manufacture, provide a higher isolation bandwidth (10%), and higher gain of 7.3 dBi with cross-polarization levels of 30 dB or lower. The single-element design was also extended to a $2\times 2$ array and studied for different beam steering and feeding scenarios. The operating bandwidths and isolation values offered by these S-band antenna and array systems can support new data link possibilities for beam steering and future low-cost IBFD wireless networks by simple antenna fabrication.

中文翻译：

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双极化高隔离天线设计和波束控制阵列，支持全双工通信，可在较宽的频率范围内工作

提出了一种新的双极化天线和阵列，用于带内全双工（IBFD）应用，可提供高端口间隔离度。单元素天线系统由四个H形缝隙，用于宽带宽的堆叠式贴片和两个外部混合耦合器组成。多层天线在大约2.1至2.4 GHz的频率范围内具有良好的匹配性，并在超过60 dB的该频率范围内提供了高隔离度。对两个不同的原型进行了仿真和测量，以突出设计过程。此外，还提出了一种新型的紧凑型混合耦合器，具有出色的相位和幅度稳定性，可改善天线辐射和IBFD性能。与其他类似类型的混合耦合器和天线系统相比，建议的配置易于制造，提供更高的隔离带宽（10％）和更高的增益（7）。3 dBi，交叉极化水平为30 dB或更低。单元素设计也扩展到了 2美元/次2美元 并针对不同的光束转向和馈电情况进行了研究 这些S波段天线和阵列系统提供的工作带宽和隔离值可以通过简单的天线制造为波束控制和未来的低成本IBFD无线网络提供新的数据链路可能性。