本篇論文主要研究於第五代行動通訊的天線，由於台灣方面對於5 G規範尚未明確，此論文是參考各方釋出的中頻段資訊（3.3 GHz ～ 3.8 GHz、4.4 GHz ～ 4.9 GHz）下去模擬與實作。一般天線是以玻璃纖維板（FR4）當作基板、導體為銅，FR4本身介電係數（εr）為4.4、正切損耗角（tanδ）為0.025，此論文是將基板更換成氧化鋁基板（Al2O3）εr為9.8、tanδ為2x10-4、導體則用銀、銅、鋁三種金屬做為比較。銀具有很高的延展性且導熱性和導電性在金屬中名列前茅，此種特性若應用的好很適合作為天線導體，銅位於元素週期表第11族，同族的還有銀和金，這些金屬的共同特點有延展性高、導電性好，銅不但柔軟，導電性、導熱性也好，在室溫下僅次於銀。而鋁的比重為2.7，密度只有2.7 gw/cm³，約為鋼、銅密度的1/3，在重量相等的基礎上，鋁的導電度為銅的兩倍。故以導電度衡量，鋁之成本比銅還低，不過鋁本身電阻率高過其他金屬，所以導電率為最差。天線圖形方面改用厚膜印刷方式呈現出來以保持圖形平整度與均勻度。而電磁波在介質中傳遞時會有一變化參數稱傳播常數（γ=α+β）、其實部α表示衰減常數，虛部β表示相位常數，在這裡我們可以控制的因數則為α，這裡對β不討論，衰減常數α是由導體損耗αc與介電損耗αd組成。本論文採用了tanδ較低的Al2O3，可將損耗看成是導體帶來的影響，以此做為基礎，我們可探討出哪種導體對天線領域或其他微波相關有帶來效益。

This paper mainly studies the antenna of the fifth-generation mobile communication（5 G）. Because 5 G don’t have a clear specifications in Taiwan,this paper reference to the middle band informations（3.3 GHz ～ 3.8 GHz、4.4 GHz ～ 4.9 GHz） by the other countries,and run the simulation and measuring. The common Antenna is a glass fiber board (FR4) as a substrate, the conductor is copper,and the FR4 has the intrinsic permittivity （εr） of 4.4 and loss tangent angle （tan δ） of 0.025. This paper replaces the substrate with alumina substrate （Al2O3）. Al2O3 has the intrinsic permittivity （εr） of 9.8 and tangent loss angle （tan δ） of 2 x10-4, the conductor is compared with silver, copper, aluminum three metals.Silver has high ductility and electrical conductivity and thermal conductivity in the metal top.And then, this kind of property is very suitable as an antenna conductor if it is applied well.Copper residing in periodic table group 11, the same family as well as silver and gold.The common feature of these metals have high ductility and good conductivity.Copper is not only soft, but also has good electrical conductivity and thermal conductivity. It is second only to silver at room temperature. Aluminum has a specific gravity of 2.7 and a density of 2.7 g/cm3, which is about 1/3 of the density of steel and copper. On the basis of equal weight, aluminum has the double conductivity of copper. Therefore, the cost of aluminum is lower than that of copper by conductivity. However, aluminum has higher resistivity than other metals, so the conductivity is the worst.The antenna pattern is replaced with a thick film printing method to maintain the flatness and evenness. While the electromagnetic wave is transmitted in the medium, there will be a parameter called the propagation constant （γ=α+β）, the real part α represents the attenuation constant, and the imaginary part β represents the phase constant. The factor that we can control to α, which don’t discuss for β in this paper. The attenuation constant α is composed of conductor loss αc and dielectric loss αd.This paper uses Al2O3 with lower tan δ, which can be regarded as the influence of conductors. Based on this idea, we can explore which kind of conductor can bring benefit to the antenna industry or other microwave correlation.

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