Abstract
In this paper a low-cost solution to tackle the problem of electromagnetic interference (EMI) is proposed for shield packaging industry. The absorber consists of circularly shaped frequency selective surface (FSS) based structure engraved on an acrylic sheet. Each unit cell of the absorber structure is filled with Plaster of Paris (POP) as a dielectric material backed with a copper foil acting as ground plane. The top of this FSS based structure is covered with a thin sheet of acrylic sheet. The periodicity of the unit cell is 0.4λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> and the thickness of the absorber is only 0.12λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> , where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the wavelength of free space at the lowest absorbing frequency. A polarization independent behaviour of the absorber is depicted up to 45° angles of incidence. A detailed parametric study is carried out on HFSS simulation tool, and a prototype model is developed. Finally, the simulated result is verified with measured results which shows a good agreement between the two. It is found that the proposed absorber structure provides a viable solution for absorbing the EMI at X-band.
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