利用頻率選擇平面去改善無線通訊訊號通過金屬鍍膜玻璃之穿透性

Frequency Selective Surface for Improving the Transmission of Wireless Communication Signals Through a Metal-Coated Glass

周暘凱(Yang-Kai Chou)

指導教授 ： 陳興義

元智大學/電機通訊學院/通訊工程學系/碩士(2012年)

https://doi.org/10.6838/YZU.2012.00073

摘要

本論文有兩個研究重點，第一部分為探討一玻璃基板表面鍍上一層十字型迴路的頻率選擇平面，在Ku-band (12.2 GHz~12.7 GHz)的頻段下研究其電磁波對它的傳輸與反射特性有何影響。經過多次實驗模擬發現，頻率選擇平面的單元幾何結構在十字形凹槽的長度L=7.2 mm，十字形凹槽的寬度W=1.0 mm，週期性單元的尺寸P=9 mm，以及玻璃基板的厚度T=5 mm，其訊號能夠有效穿透鍍有頻率選擇平面的玻璃基板，並能夠有效阻擋Ku-band (12.2GHz~12.7GHz)之外的其它訊號。從模擬結果以及量測資料觀察，該玻璃基板的共振頻率落在12.45 GHz，而在Ku-band (12.2GHz~12.7GHz)的頻段範圍內，其反射損耗(S11)均在-10 dB以下。這項研究顯示利用玻璃基板在Ku-band (12.2GHz~12.7GHz)的頻段下設計出高穿透性的頻率選擇平面是可以被達成的。第二部分將提出一雙頻頻率選擇平面去改善在900 MHz和1800 MHz頻段時能夠加強電波訊號穿透建築物玻璃窗的效果，並且在900 MHz和1800 MHz頻段之外的任何頻率下也能強化其電磁雜訊的遮蔽效應。此雙頻頻率選擇平面包含了4個小耶路撒冷十字形槽孔結構和1個大耶路撒冷十字形槽孔結構。透過研究模擬以及對各項幾何參數進行了理論分析，得到了最佳幾何結構。此雙頻頻率選擇平面的穿透性與反射性之理論模擬亦利用實驗量測加以比較驗證。

關鍵字

頻率選擇平面 ； 金屬鍍膜玻璃 ； 玻璃

並列摘要

In the first part of this research work, a frequency selective surface (FSS) consisting of cross-slot elements coated on a flat glass was used to study the impact on transmission and reflection at Ku-band frequencies of 12.2~12.7 GHz. Based on the simulation experience of the first partial study, the FSS element with geometrical parameters the width of a cross-slot W=1.0 mm, the length of a cross-slot L=7.2 mm, the periodicity of a FSS element P =9 mm, and the thickness of the flat glass T=5 mm was proposed for signals to transmit the flat glass coated with the FSS at Ku-band frequencies of 12.2~12.7 GHz and to be blocked by the flat glass coated with the FSS outside the Ku-band frequencies. From simulation results and measurement data, it is shown that the resonant frequency of the flat glass coated with the proposed FSS is around 12.5 GHz which is in the Ku-band (12.2~12.7 GHz) for the reflection with better than -10 dB. It is also shown that high transmission in the useful frequency band (12.2~12.7 GHz) can be achieved by using the proposed FSS coated on the flat glass. In the second part of this research work, a dual-band FSS consisting of four smaller and one larger Jerusalem cross-slots was used to study the shielding effectiveness of electromagnetic (EM) noises through building glass windows. The larger and smaller regular Jerusalem cross-slots are used to improve the transmission of EM signals through a glass attached with the FSS in the frequency bands of 900 and 1800 MHz, respectively, but also used to enhance the shielding effectiveness outside the frequency bands of 900 and 1800 MHz. Through extensive studies on geometrical parameters by simulations, the optimum values of geometrical parameters of the FSS are obtained. Simulation results of the transmission and reflection of the glass attached with the proposed FSS are validated by measurement data.

並列關鍵字

Frequency Selective Surface ； FSS ； Metal-Coated Glass ； glass

參考文獻

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