Dual-Band Frequency Selective Surface for Improving the Transmission of Bluetooth and WLAN Signals through Energy-Saving Glasses

• Main Authors: Tsung-Han Lin, 林琮翰
• Other Authors: Hsing-Yi Chen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/20177931763545155752

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.