天線工程期中報告 論文研討: Yong-Ling Ban, Cheng-Li Liu, Zhi Chen, Joshua Le-Wei Li, and Kai Kang “Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications ,” IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 13, 2014. 報告人: 碩研電子一甲 MA430222 廖冠傑 Southern Taiwan University of Science and Technology

Outline 1.摘要 2.天線架構 3.結果與討論

摘要 八頻的LTE/WWAN 用兩個直接饋入路徑產生高頻以及由地延伸兩個分支路徑產生低頻 運用3個元件做電路匹配產生額外增強較低頻帶的頻寬 五個共振模態到達704-960和1710-2690MHz 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線設計 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線設計 探討模態的變化。 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線設計 Ref3就是饋入那裏的電路匹配，可以看出一個並聯諧振產生大約在1000MHz，涵蓋LTE700 / GSM850 / 900。 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線設計 模擬各個模態頻率的電流圖 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線實作(正反面)

實作的2D場型圖 圖7測量的場型圖分別有 (a)812MHz (b)1740MHz (c)2650MHz。 (b)(c)1750MHz、2650MHz，在圖中發現有比較大的變化。 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

實作增益與效率 在低頻的效率 ( 40% - 53% ) 天線增益 ( 0.5 - 0.6 dBi )。 效率都在於40%以上，這是實作上非常希望達到的。 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

天線模擬與實作圖 1.模擬和實作的 Return loss 的對照表. 實作的RETURN LOSS 和模擬的相比是吻合的. 2.模擬和實作也是吻合的然後在我們要得頻帶都保持在-6dB以下 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

結論 此天線設計的架構密集，一個小尺寸的多諧振天線包括兩個直接饋入路徑和一個電感相連的兩分支路徑達到八頻的LTE/WWAN。應用兩個電感和一個電容電路匹配電路。頻帶用於704-960和1710-2690MHz。該天線是有希望在智慧型手機的八頻的LTE/WWAN操作應用。 參考文獻 Small-Size Multiresonant Octaband Antenna for LTE/WWAN Smartphone Applications

心得 本文的天線設計雖然比較密集，但是運用了電路匹配使低頻的頻寬變得更好，電路匹配是自己還不太會的地方，現在要設計其他有關的天線可能都需要，需要花更多時間來研究電路匹配的方法，這樣才有效利用以及變得更獨特的天線。

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