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Optimization of a double 90° bend waveguide. (a) Permittivity map of the defective EBG device where the DR is superimposed with light grey rectangle and (b) the corresponding electric field amplitude distribution. (c) and (d) the same as (a) and (b) but for the optimized EBG device through the I-SMM [ϵ opt =12.2,14.3,12.2,12.5,11.9,12.5,17.7,11.3,12.4,7.4,8.3,13.7,14.4,14.2,12.9,13.2,12.8,12.9, 11.8,21.6].
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