| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 102 === In the first part of this research work, based on an equivalent circuit model, the least-square curve fitting technique is proposed to quickly design optimum values of geometrical parameters of a dual-band Jerusalem-cross element for arbitrarily specifying any dual resonant frequencies. The validity of the least-square curve fitting technique is checked by comparing geometrical parameters and dual resonant frequencies of six Jerusalem-cross grids obtained by the proposed technique with those obtained by the improved empirical model and measurement method. Design of dual-band Jerusalem-cross slots is also conducted by the proposed technique. Simulation results of reflection and dual resonant frequencies of Jerusalem-cross slots designed by the proposed technique are also validated by measurement data. In the second part of this research work, A dual-band slot frequency selective (FSS) surface consisting of Jerusalem-cross elements was designed and coated on an energy-saving glass. The proposed dual-band slot FSS can be used to provide a better signal transmission through energy-saving glass at 2.45 GHz and 5.8 GHz. Return losses of the energy-saving glass with the dual-band slot FSS are improved by a factor of 10 dB and 3 dB at 2.45 GHz and 5.8 GHz, respectively. While transmission of the energy-saving glass with the dual-band slot FSS are improved by a factor of 50 dB and 40 dB at 2.45 GHz and 5.8 GHz, respectively. The ratio of area occupied by the dual-band slot FSS to area of the energy-saving glass is 35.6 %, which may slightly degrade thermal isolation capability but can greatly improve the communication quality for wireless communications. The structure of the dual-band slot FSS consisting of Jerusalem-cross elements is easily fabricated and has a beautiful pattern on building windows.
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