摘要

現今，由於無線技術與行動穿戴裝置的飛快發展導致可用頻譜短缺。為了解決這個摁問題，吾人引入被稱之為5G的通信技術。本論文是有關於一款應用於5G通信的雙極化天線設計，在本論文終將分為兩大主題，首先是應用於6GHz的雙極化天線。再者是用於毫米波的頻帶的線性雙極化天線設計

在天線設計中，吾人提出一款集成平衡-不平衡的轉換器用以實現雙極化電耦極天線。首先設計兩組單極化集成巴倫饋入的電耦極天線，然後將兩個單極化天線以正交形式組合，這將形成一線性雙極化天線，其模擬的阻抗頻帶寬33%，模擬天線增益為7.7dBi，並具有穩固結構。

在論文的第二部分，設計了雙極化毫米波天線，在這裡使用基板整合波導(SIW)製造一共振腔，並在其上設計輻射於28GHz之交叉槽孔天線，共振於28.3GHz。天線經由SIW中的多層孔徑偶和饋入，具兩個獨立的端口，這兩個端口正交放置於不同的層上。因此實現了共振在28.3GHz 具有5dBi的模擬增益的窄頻線性雙極化天線

Abstract
Nowadays, due to the rapid increase of mobile and wireless applications resulted in a shortage of available frequency spectrum. To solve this, a technology called 5G communications is introduced. This thesis is about designing a dual-polarized antenna for 5G communications. It consists of 2 research types, the first one is dual-polarized antenna at sub-6 GHz band. While the second one is a design of a linearly dual-polarized antenna for mm-Wave applications.
In the first antenna, an integrated balun feed planner dipole is proposed to realize the dual-polarized antenna. Two single, linearly polarized integrated balun feed antenna is designed first, after that, the two single polarized antenna elements are combined in an orthogonal form. This resulted in a linearly dual-polarized antenna which has 33% impedance bandwidth and 7.7 dBi simulated antenna gain with compact structure.
In the second part of the thesis, a linearly dual-polarized mm-Wave antenna is designed. Here Substrate Integrated Waveguide (SIW) cavity-backed crossed slot antenna is used for radiation at 28GHz band resonance. The antenna is fed by SIW multilayer aperture coupling using two independents ports which is placed orthogonally at a different layer. Thus, a linearly narrowband dual-polarized antenna that resonates in the 28.3 GHz and 5 dB simulated gain is achieved.

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