{"title":"设计可重构智能表面中的物理光学和反射位置性","authors":"Javad Shabanpour;Yongming Li;Sergei Tretyakov;Constantin Simovski","doi":"10.1109/OJAP.2024.3422681","DOIUrl":null,"url":null,"abstract":"This paper discusses the applicability conditions of the Physical Optics (PO) approximation and investigates its predictive power for far-field diffraction patterns of Reconfigurable Intelligent Surfaces (RISs) based on binary metasurfaces (BMSs). We compare the PO model with the approximation of socalled Reflection Locality (RL). Although these two approximations are conceptually different, in the case of BMSs, RL turns out to be a prerequisite of the applicability of the PO. If RL holds for such RISs, PO adequately predicts the diffraction pattern only in the case of large periods, which restricts the applicability of the PO to rather small deflection angles. Recently, it was shown that the RL approximation and the popular approximation of so-called angular stability for periodically non-uniform reflecting metasurfaces are equivalent. Therefore, we conclude that BMSs with angular stability can be successfully designed using the PO approximation if the required deflection angles are restricted. In the absence of angular stability, the accuracy of PO is very poor. This finding highlights the importance of considering both the angular stability and the electromagnetic dimensions in RISs designs.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"5 6","pages":"1571-1579"},"PeriodicalIF":3.5000,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10584092","citationCount":"0","resultStr":"{\"title\":\"Physical Optics and Reflection Locality in Designing Reconfigurable Intelligent Surfaces\",\"authors\":\"Javad Shabanpour;Yongming Li;Sergei Tretyakov;Constantin Simovski\",\"doi\":\"10.1109/OJAP.2024.3422681\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This paper discusses the applicability conditions of the Physical Optics (PO) approximation and investigates its predictive power for far-field diffraction patterns of Reconfigurable Intelligent Surfaces (RISs) based on binary metasurfaces (BMSs). We compare the PO model with the approximation of socalled Reflection Locality (RL). Although these two approximations are conceptually different, in the case of BMSs, RL turns out to be a prerequisite of the applicability of the PO. If RL holds for such RISs, PO adequately predicts the diffraction pattern only in the case of large periods, which restricts the applicability of the PO to rather small deflection angles. Recently, it was shown that the RL approximation and the popular approximation of so-called angular stability for periodically non-uniform reflecting metasurfaces are equivalent. Therefore, we conclude that BMSs with angular stability can be successfully designed using the PO approximation if the required deflection angles are restricted. In the absence of angular stability, the accuracy of PO is very poor. This finding highlights the importance of considering both the angular stability and the electromagnetic dimensions in RISs designs.\",\"PeriodicalId\":34267,\"journal\":{\"name\":\"IEEE Open Journal of Antennas and Propagation\",\"volume\":\"5 6\",\"pages\":\"1571-1579\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-07-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10584092\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Open Journal of Antennas and Propagation\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10584092/\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Open Journal of Antennas and Propagation","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10584092/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
摘要
本文讨论了物理光学(PO)近似的适用条件,并研究了其对基于二元元表面(BMS)的可重构智能表面(RIS)远场衍射图样的预测能力。我们将 PO 模型与所谓的反射位置(RL)近似进行了比较。虽然这两种近似方法在概念上有所不同,但就 BMS 而言,RL 是 PO 适用性的先决条件。如果 RL 在此类 RIS 中成立,那么 PO 只能在大周期的情况下充分预测衍射图样,这就限制了 PO 在较小偏转角情况下的适用性。最近的研究表明,对于周期性非均匀反射元面,RL 近似值和流行的所谓角度稳定性近似值是等价的。因此,我们得出结论,如果所需的偏转角受到限制,使用 PO 近似值可以成功设计出具有角度稳定性的 BMS。在没有角度稳定性的情况下,PO 的精确度很低。这一发现强调了在 RIS 设计中同时考虑角度稳定性和电磁尺寸的重要性。
Physical Optics and Reflection Locality in Designing Reconfigurable Intelligent Surfaces
This paper discusses the applicability conditions of the Physical Optics (PO) approximation and investigates its predictive power for far-field diffraction patterns of Reconfigurable Intelligent Surfaces (RISs) based on binary metasurfaces (BMSs). We compare the PO model with the approximation of socalled Reflection Locality (RL). Although these two approximations are conceptually different, in the case of BMSs, RL turns out to be a prerequisite of the applicability of the PO. If RL holds for such RISs, PO adequately predicts the diffraction pattern only in the case of large periods, which restricts the applicability of the PO to rather small deflection angles. Recently, it was shown that the RL approximation and the popular approximation of so-called angular stability for periodically non-uniform reflecting metasurfaces are equivalent. Therefore, we conclude that BMSs with angular stability can be successfully designed using the PO approximation if the required deflection angles are restricted. In the absence of angular stability, the accuracy of PO is very poor. This finding highlights the importance of considering both the angular stability and the electromagnetic dimensions in RISs designs.