Frequency splitting patterns in wireless power relay transfer

Frequency splitting patterns in low‐order wireless power relay transfer systems are analysed by the coupled‐mode theory. In addition to the V‐type splitting pattern reported widely, two new patterns, I‐type and W‐type, are introduced. Specifically, it is found that a 0‐relay system shows a V‐type or I‐type splitting; a symmetrical 1‐relay system shows an I‐type or W‐type splitting; and a symmetrical 2‐relay system usually shows a V‐type or W‐type splitting. The criteria for different frequency splitting patterns are given, and the theoretical results are validated finally by 1‐relay and 2‐relay wireless power transfer experimental systems.