论文标题
使用metasurface的近场角扫描增强天线阵列
Near-Field Angular Scan Enhancement of Antenna Arrays Using Metasurfaces
论文作者
论文摘要
在本出版物中，我们继续使用Metasurfaces扩展分阶段阵列的角度扫描范围。我们详细考虑使用源近场中的单个跨表镜头的扫描增强，并为获得所需的光束提供了源激发的分析表达式。我们表明，这种设备的方向性降解与远场镜头放置相同。此外，我们详细讨论了这种方法有局限性，并且不能将镜头任意放置在源数组中。然后，我们提出了两个镜头近场扫描增强子，该扫描剂不受相同的限制，尽管仍会遭受相同的方向性降解。最后，我们提出了一个二进制元表概念，从理论上讲，它可以实现所需的扫描增强，而无需定向性降解。然后，通过全场模拟验证了一些理论主张。
In this publication we continue our previous work on extending the angular scan range of phased arrays using metasurfaces. We consider in detail scan enhancement using a single metasurface lens in the near-field of a source and provide analytical expressions for source excitation to obtain a desired beam. We show that such a device suffers from the same directivity degradation as in the case of far-field lens placement. Moreover, we discuss in detail that this approach has limitations, and one cannot place the lens arbitrarily close to the source array. We then propose a two-lens near-field scan enhancer which is not subject to the same limitations, although still subject to the same directivity degradation. Finally we propose a binary metasurface concept which theoretically achieves desired scan enhancement without directivity degradation. Some theoretical claims are then verified via full-field simulations.
