Optimization of multi-band AMC surfaces with magnetic loading

This work presents single-bband and multi-band artificia magnetic conducting (AMC) surface designs that are shown to have significant bandwidth enhancement achieved by loading the substrate with a magnetic material. In both cases, a conventional AMC structure consisting of a high impedance frequency selective surface (HZ-FSS) is optimized using a genetic algorithm (GA) for maximum bandwidth. The single-band design operates at 2 GHz, while the multiband design has targeted resonant frequencies of 860 MHz, 1.575 GHz, and 1.88 GHz. These design examples serve to demonstrate that the inclusion of a modest amount of magnetic material within the substrate allows for improved bandwidth at all resonant frequencies.