共平面波導饋入圓形極化天線

CPW-FED CIRCULARLY POLARIZED ANTENNAS

王聖憲(Sheng-shian Wang)

指導教授 ： 張知難

大同大學/電機資訊學院/通訊工程研究所/碩士(2008年)

摘要

本篇論文提出一種由共平面波導饋入的寬頻圓形極化天線，它同時具有寬廣的阻抗和軸向比頻寬。這天線被設計用來應用於3 GHz頻段的全球互通微波存取(WiMAX)。10 dB的阻抗頻寬為38.5 ％ (2.75~4.058 GHz)，3 dB的軸向比頻寬為22.3 % (3.288~4.111%)，而在頻寬內天線的增益範圍在0.5~6.2 dBic之間。量測輻射場型所呈現的結果滿足IEEE 802.16標準所操作的頻段3.4~3.69 GHz。所呈現的天線不只提供了寬頻，還能產生圓形極化波，可以進一步改善接收訊號的能力。

關鍵字

圓形極化 ； 共平面波導饋入 ； 天線

並列摘要

In this thesis, a CPW-fed wideband circularly polarized antenna is proposed to provide wide impedance and axial ratio bandwidths simultaneously. The antenna is designed and implemented for the 3-GHz WiMAX access points. The measured 10-dB return loss bandwidth is 38.5 % (2.75~4.058 GHz), the 3dB axial ratio bandwidth is 22.3 % (3.288~4.111 GHz), and the in-band antenna gains lie in the range of 0.5~6.2 dBic. The measured radiation patterns are shown to be satisfactory across the entire operating band 3.4~3.69 GHz for the IEEE 802.16 group standards. The present antenna not only provides this wide bandwidth but also generates a circular polarized wave. The latter one may further improve the reception ability.

並列關鍵字

circular polarization ； coplanar-waveguide fed ； antenna

參考文獻

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