利用疊層槽孔環改善微帶天線圓形極化之特性

STACKED RING-PATCH CIRCULARLY POLARIZED ANTENNA

洪一平(I-PING HUNG)

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(2010年)

摘要

本篇論文提出一種利用環形金屬結構改善微帶天線頻寬的方法，環形金屬結構疊置於矩形微帶天線上方約0.1波長處，並以空氣做為兩結構間之介質，並藉由控制環形結構與矩形微帶天線的相對尺寸產生圓形極化波，實驗量測數據為10dB的阻抗頻寬為15.7%(836~979MHz)，3dB的軸向比頻寬7.7%(870~940MHz)，而天線的增益6dBic以上操作頻率範圍為120MHz(850-970MHz)。

關鍵字

射頻辨識 ； 讀碼天線 ； 微帶天線 ； 圓形極化

並列摘要

In this thesis, a ring-patch circularly polarized antenna is presented. The ring is stacked above the patch and is separated from the patch by an air layer with around 0.1 wavelengths thickness. By controlling relative sizes of the ring and the patch, a wideband circularly polarized wave can be generated. In experiment, the antenna yields a 10dB return loss bandwidth of 15.7%(836-979MHz) and a 3dB axial ratio bandwidth of 7.7%(870-940MHz). the antenna gain is more than 6dBic within the over lapped return loss and axial ratio bandwidth.

並列關鍵字

RFID ； Reader Antenna ； microstrip antenna ； circular polarization

參考文獻

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