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    Title: 應用田口法及有限時域差分法於雙頻 WLAN/BT 天線的最佳化與強健設計
    Other Titles: Application of Taguchi’S Method and Fdtd Scheme to the Optimal and Robust Design of Dual-Band Wlan/Bt Antennas
    Authors: 李慶烈
    Contributors: 淡江大學電機工程學系
    Keywords: Taguchi’s method;finite difference time domain method;WLAN antenna;BT antenna;robust design;Π-type antenna;discretized patch
    Date: 2011-08
    Issue Date: 2012-05-22 21:52:49 (UTC+8)
    Abstract: 本計劃將應用田口法及有限時域差分法於雙頻WLAN/BT 天線的最佳化與強健設計,此處所指的 田口法涵蓋兩個面向:(1)田口最佳化法,(2)田口品質工程法。針對第一個面向,我們將結合田口 最佳化法與有限時域差分法於WLAN/BT 平面天線,以進行最佳化設計,預期其效果將可大幅超越 (2~10 倍)其它全域搜尋最佳化法(包括GA、PSO、DDE 等)。針對第二個面向,我們將應用田口 品質工程法於上述的最佳天線(指已滿足所設定的頻帶規格),進行敏感度測試,以達成強健設計的 目的。 由於目前所有商用電磁模擬軟體的最佳化工具並無田口最佳化法可用來進行測試,本計劃在第一 年將先自行開發撰寫一3D 時域有限差分法電腦程式,再結合田口最佳化法,用來模擬設計兩個創新 且其結構參數值為連續的平面倒F 天線結構,包括一種混合IFA 及彎繞回路天線的combo 結構以及一 個Π 型(dual-IFA)的天線結構,以進行天線結構參數的最佳化設計,其結果並將與GA、DDE 與PSO 等最佳化方法進行比較。 本計劃第二年將繼續應用時域有限差分法與田口法於天線的設計,但此次將用來模擬一寬頻天線 (中心頻率仍在2.45GHz 以及5.2GHz 附近,且各自的頻寬皆達25%以上),這是一種將貼片離散化 (discretized)的微帶天線結構,此次測試的未知數將介於400~900 個,且屬於一種具大量結構參數且 結構參數值為不連續的特殊天線,值得一提的是,對於此種結構參數值為不連續的工程問題,現有訴 求利用範圍逐步縮減(range reduction)的迭代搜尋機制將不再適用,為此,我們將提出一創新的亂數搜 尋機制,以充分開發並展現應用田口最佳化法在天線設計議題上的獨特能力。 接著,我們仍將應用田口品質工程法於該最佳化天線,以進行敏感度測試,達成強健設計的目的。 另外,除了以傳統的FR4 電路板,進行設計之外,我們並將針對FPCB(Flexible PCB)軟板進行設計 與製作,並將此一寬頻天線與人體模型相結合,進行將此一寬頻天線應用於智慧衣的測試,針對此種 近身天線的設計,得進一步將人體的介電影響納入以維持天線的性能;另一方面,如何減少人體遭受 來自近身天線的電磁劑量(SAR),我們亦將進行探究。
    The purposes this project are to apply the Taguchi’s methods and finite difference time domain scheme to the optimization and robust design of dual-band WLAN / BT antennas. Taguchi’s methods here are referred to two aspects: (1) Taguchi’s optimization method, (2), Taguchi method for quality control. For the first aspect, we will combine Taguchi’s optimization method and the finite difference time domain scheme for the optimization and robust design of dual-band WLAN / BT antennas. It is expected that the outcomes will significantly outperform those (about 2 ~ 10 times) by other global searching methods (including the GA, PSO, DDE, etc.). For the second aspect, we will apply the Taguchi method for quality control for the above optimized antenna (which means it has already met with the band requirement of the spec.), by which the sensitivity tests are conducted in order to achieve objectives of robust design. Since all electromagnetic simulation softwares commercially available do not provide the optimization tool of Taguchi’s method. Thus, in the first year, this project will conduct to write a 3D finite difference time domain computer program ourselves. And then, we will combine the home-made program with Taguchi optimization method and apply them to achieve the optimized design of two innovative planar inverted F antenna structures, which include a combo structure of IFA and bending loop antenna, and a Π-type (dual-IFA) antenna structure; both have continuous structural parameters. The structural parameters of these antennas will be optimized, while the results will be compared to those obtained by using other optimization methods, such as GA, DDE and PSO, etc. In the second year, this project will continue to apply the finite difference time domain scheme and Taguchi’s optimization method to antenna designs, but this time, we will test it upon a broadband antenna ( the center frequencies are still around 2.5GHz and 5.2GHz, and their bandwidth are both greater than 25% or more), of which the structure is in a way of patch-like (but discretized) microstrip antenna. The unknown number to be tested is between 400 and 900, thus it belongs to the catalog of antennas with large number of structural parameters. Especially, the parameter values of the antenna structure are not continuous. It is worth mentioning that the searching mechanism of Taguchi’s optimization method based on the gradual range reduction will fail for the engineering problems of discrete structural parameters. Therefore, we will propose an innovative random-search mechanism to fully develop and demonstrate the unique ability of Taguchi’s optimization method for the antenna design issues. Next, we will apply the Taguchi method of quality control to the obtained optimized antenna, , by which the sensitivity tests are conducted in order to achieve objectives of robust design. For the antenna design, in addition to the utilization of the traditional FR4 circuit board, we will use the FPCB (Flexible PCB) soft board to design and fabrication purposes. Furthermore, the dual-broadband antenna is associated with the model of human body for the test of applying the broadband antenna for the smart cloth. For the design of such an on-body antenna, it requirew to include the dielectric effect of the human body in order to maintain the performance of the antenna; on the other hand, how to reduce the SAR due to the on-body will also be explored in this project.
    Appears in Collections:[電機工程學系暨研究所] 研究報告

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