臺灣博碩士論文加值系統

本論文主題為應用於非連續性腔體之低頻電磁屏蔽研究，屏蔽頻段為30MHz ~ 960MHz，頻段為資訊類電子產品設備電磁防護頻段，內容中先透過電磁分析軟體的模擬進行圖形與結構研究，並分析其參數與屏蔽效果。
本文提出四種基本元素類型的頻率選擇表面及基本元素型延伸的雙頻圖形，分別是C環形、圓環形、方環形以及十字形，和雙頻的互補式雙環形、雙圓環形、雙方環形以及米字形，從中分析電磁波三模態與雙頻間距，選出最適合的圖形為十字形，元素大小為45 mm x 45 mm，使用夾合式雙層基板，單一基板厚度為1.6 mm，分析其週期性排列方式與大小，最終選擇為基本的周期性排列與週期性面積大小為180 mm x 180 mm的尺寸，十字形在屏蔽頻段中都有高於30dB，呈現出良好的表現，最終對文中所述的週期性結構進行總結，並思考對於未來低頻屏蔽的方法或設計方式有關的方向與應用。

The topic of this paper is the low frequency electromagnetic shielding research applied to discontinuous cavity, the shielding frequency band is 30MHz ~ 960MHz, the frequency band is electromagnetic protection band for information electronic equipment, the content of the first graphical and structural research through electromagnetic analysis software simulation, and analyze the parameters and shielding effect.
In this paper, we propose four basic element type frequency selection surfaces and basic element type extended dual frequency shapes, namely C-ring, circular, square, and cross, and dual frequency complementary dual-ring, dual circular, dual-sided ring, and meter shape. The cross shape showed good performance in the shielding band with the element size of 45 mm x 45 mm, using a sandwich double-layer substrate with a thickness of 1.6 mm, analyzing its periodic arrangement and size, and finally choosing the basic periodic arrangement and periodic area size of 180 mm x 180 mm. The final conclusion of the periodic structure described in the paper and the consideration of the direction and application for future low frequency shielding methods amd designs.

摘要 I
ABSTRACT II
誌 謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章 緒論 1
1.1 前言 1
1.2 研究動機 2
1.3 文獻探討 3
1.4 章節提要 4
第二章 基本設計原理 5
2.1 馬克斯威爾方程式 5
2.1.1 完全介質中的電磁波傳遞 7
2.2 傳輸線原理 8
2.2.1 傳輸線有損耦合型 9
2.2.2 傳輸線有損非耦合型 10
2.3 弗洛凱理論 Floquet’s Theorem 16
2.4 電磁屏蔽解析 18
2.4.1 電場屏蔽 18
2.4.2 磁場屏蔽 20
2.4.3 電磁屏蔽 20
第三章 低頻屏蔽研究與結果 22
3.1 頻率選擇表面概述 22
3.2 頻率選擇表面圖形分析 23
3.2.1 頻率選擇表面三模態分析 29
3.2.2 頻率選擇表面雙頻圖形分析 32
3.3 頻率選擇表面圖形選擇 37
3.3.1 十字形參數探討 41
3.3.2 週期性結構大小探討 45
3.4 頻率選擇表面量測結果 50
3.4.1 同軸治具量測 50
3.4.2 電波暗室與自由空間量測 53
3.4.3 電擊實驗量測 58
第四章 結論與未來展望 60
4.1 結論 60
4.2 未來展望與研究方向 61
參考文獻 63

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