Optimization of Multilayer Microwave Absorbers using Multi-strategy Improved Gold Rush Optimizer

In this study, a multi-strategy improved gold rush optimizer (MIGRO) is proposed for the design of multilayer broadband microwave absorbers (for normal incidence). The purpose of this optimization process is to minimize the maximum reflection coefficient of the absorber by selecting appropriate material layers from existing literature databases within the desired frequency range. To enhance the performance of a gold rush optimizer (GRO), three improvement strategies are proposed. This paper demonstrates the effectiveness of the improved strategy and the superior reflection coefficient of the MIGRO compared to other heuristic algorithms used for the design of microwave absorbers through two different simulation examples.