Abstract
This paper presents the design and fabrication of an ultra-thin and flexible electromagnetic interference (EMI) shield that is capable of rejecting multiple unwanted frequencies. The design starts with the equivalent circuit model of periodic concentric rings to determine the initial geometrical dimensions of the rings efficiently. Then it followed by full-wave electromagnetic simulation to fine-tune the final dimensions for the desired frequency response. Impacts of various geometrical designs on the EMI shielding performance of the concentric ring design are analyzed and discussed. With these results, an ultra-thin and flexible EMI shield is fabricated using the screen printing technique. Finally, its multi-band rejection performance is validated experimentally. Good correlation between measurement and simulation is demonstrated in this paper.
Highlights
With the exponential growth of wireless communications, the number of base stations is expected to increase for better service coverage
This paper describes the design procedure of an ultra-thin and flexible multiple-band rejection electromagnetic interference (EMI) shield
Once the initial geometrical dimensions of the ring structure is obtained from the equivalent circuit model, 3D full wave simulation of the structure can be carried out using a commercial 3D EM solver software with the necessary boundary conditions being considered [30]-[32]
Summary
With the exponential growth of wireless communications, the number of base stations is expected to increase for better service coverage. Light weight EMI shields that are ultra-thin, highly flexible and can be applied to existing walls of a building will be an attractive solution [3]. (2014) Ultra-Thin and Flexible Multi-Band Rejection EMI Shield. Closures have no frequency selective shielding feature and practically block out electromagnetic waves of all frequencies. For EMI shield that only block out several undesirable frequencies, frequency selective surface (FSS) design maybe applied to offer such capability [4]-[6]. By taking advantage of printed periodic elements to provide the frequency selective feature, the EMI shield can reject specific unwanted frequencies without affecting other wireless services. This paper describes the design procedure of an ultra-thin and flexible multiple-band rejection EMI shield. A prototype based on screen-printing is fabricated and its multi-band rejection capability is demonstrated experimentally
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