Abstract
In this paper, a round corner design optimization method for the square coupler is proposed to improve its mutual inductive coupling characteristics by analyzing the relationship between structural characteristics and coupling characteristics of the circular and square couplers. The influence of the optimization parameter on the mutual inductive coupling characteristics and the selection method of the optimal optimization parameter is given. Based on the optimal parameter, the coupling characteristics of circular, square, and optimized square couplers are comprehensively compared under the different gap and horizontal offset distances. Through the simulation and experimental results, the optimized square coupler corresponding to the optimal parameter can combine parts of the advantages on the coupling characteristics of the circular and square couplers, thereby maximizing the mutual inductive coupling characteristics of the square coupler. Besides, the coupling characteristics among the circular, square, and optimized square coils are analyzed. The method to use the optimized square coil as the emitter coil, and use the circular and square coil as the receiver coil, respectively, can have better interoperability.
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