Abstract
Design optimization to achieve broadband microwave absorption of a metal backed single layer microwave absorber in Dallenbach form is investigated by perforated designing of polyaniline (PA) reinforced novolac phenolic resin (NPR) composites in the frequency ranges of 8.2-12.4 GHz. The effect of triangular lattice pattern circularly perforated design is studied through effective complex permittivity and impedance matching condition between air-absorber interfaces. A comparative analysis of broadband absorption efficiency of perforated and non-perforated PA/NPR composite is carried out in terms of impedance matching to support the tailoring of microwave properties. The study shows a -15dB whole X band absorption bandwidth for PA3 perforated sample of thickness 3mm with a maximum absorption peak of ∼-35dB at 12.4 GHz.
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