Figure 1.

A coordinate transformation method is proposed for regulating electromagnetic waves. Based on a geometric coordinate transformation method (a), an ellipsoidal electromagnetic cloak (b) and an arbitrary geometric cloak (c) are designed. Reproduced with permission from [58]. Copyright © 2021, Elsevier. The electromagnetic wave concentrator is designed based on a coordinate transformation process (d) and the simulation results (e,f). Reproduced with permission from [59]. Copyright © 2019, Wiley. An electromagnetic cloak designed based on a coordinate change method (g) and a preset electric field and power trend (h), and radar detection results (i). Reproduced with permission from [60]. Copyright © 2019, AIP Publishing.