face in order to achieve light off and regeneration in a discrete zone may be performed using the frequency filter layer 152 and the broadband absorbing layer 154 the frequency filter layer 152 may include a high temperature reflective electrically conductive and metallic material that resists oxidation the frequency filter layer 152 may include stainless steel platinum a super alloy austenitic nickel based superalloys an iron nickel based alloy a noble metal copper etc in one embodiment an iron nickel feni alloy with approximately 64 iron approximately 36 nickel and some carbon and chromium is used the frequency filter layer 152 includes one or more open frequency select patterns that are each designed to pass an independent narrow frequency band of radiation the three segments 156 of the frequency filter layer 152 differ in the frequency of radiation that they allow to pass through as generally shown by reference frequencies f 1 f 3 the broadband absorbing layer 154 absorbs the frequency energy passed through the segments 156 the term broadband may refer to a wide range of frequencies the broadband absorbing layer 154 may include a broadband microwave absorbing material such as indium tin oxide ito and silicon carbide the broadband absorbing layer 154 may include one or more magnetic dipoles electric dipoles and semiconducting materials the semiconducting materials may conduct at ambient temperatures the broadband absorbing layer 154 may include oxidized materials fig4 illustrates how microwave energy passes through at the corresponding frequencies f 1 f 3 of the three segments 156 each of the segments 156 has a.