In this letter, a beam-scanning printed dipole antenna fed by a rectangular patch with periodic structures is proposed. A simple rectangular patch embedded with rampart line structures is used as the novel feeding structure for the planar dipole. The embedded rampart line structures are used to reduce the size and radiation of the rectangular patch, which facilitates feeding. By exciting the coupled modes of the dipoles, continuous and gradual phase differences for the dipole arms can be achieved so as to achieve beam scanning. A double-layer reflector and director are used to enhanced the antenna gains. In the simulated results, the dipoles radiated a beam that scanned from −48° to 14° in the azimuth planes as frequency changed. The measured results show consistent scanning beams within the operating bands from 3.16 to 3.24 GHz. The measured gain ranged from 3.27 to 5.58 dBi within the corresponding bands. Furthermore, the proposed antenna had a high radiation efficiency close to 90%, as well as a compact size.

中文翻译：

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具有周期性结构的矩形贴片馈电的光束扫描印刷偶极子天线


在这封信中，提出了一种由具有周期性结构的矩形贴片馈电的波束扫描印刷偶极子天线。嵌入壁垒线结构的简单矩形贴片被用作平面偶极子的新型馈电结构。采用嵌入式壁垒线结构，减小矩形贴片的尺寸和辐射，方便馈电。通过激发偶极子的耦合模式，可以实现偶极臂连续渐变的相位差，从而实现光束扫描。采用双层反射器和导向器来增强天线增益。在模拟结果中，偶极子辐射出随着频率变化而在方位角平面上从-48°扫描到14°的光束。测量结果显示在 3.16 至 3.24 GHz 工作频段内扫描波束一致。在相应频段内测得的增益范围为 3.27 至 5.58 dBi。此外，所提出的天线具有接近 90% 的高辐射效率，并且尺寸紧凑。