利用QUAD-EMC架構形成雙頻雙圓形天線

Dual-Band Circularly Polarized Antenna with QUAD-EMC structure

倪國揚(Guo-Yang Ni)

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(2006年)

摘要

本論文提出一個利用QUAD-EMC結構達成雙層、單一饋入之雙頻雙圓形極化的天線。此雙頻雙圓形極化的設計是由在下層基板的patch耦合至均勻排列在上層基板的四個相同的patch。藉由適當的調整上下層patch的大小尺寸以及patch的截角尺寸,此天線就能使用單一饋入而達成雙頻雙圓形極化的效果。接下來利用此結構設計並實際量測一個操作在無線射頻辨識系統915MHz及2.45GHz之天線。並且,我們再加入一置於FR4基板下之空氣層以增加天線增益及折返損失的頻寬。最後,加上空氣層的雙頻雙圓形極化天線,其折返損失頻寬以及增益都強烈的增加。

關鍵字

雙頻 ； 圓形極化

並列摘要

In this paper, a method for obtaining a two-layer single-feed dual-band circularly polarized antenna with QUAD-EMC structure is proposed and studied. The proposed dual-band CP design is achieved by four identical patches uniformly displayed with a rectangular aperture and fed electromagnectically by a driven patch etched on a lower substrate. Then, by tuning upper and lower patch size and truncating patch corners respectively and properly, the proposed antenna can perform dual-band CP radiation using a single probe feed. Prototypes of the proposed antennas designed for RFID operations in the 915MHz and 2.45GHz bands are presented and experimentally demonstrated. Furthermore, an air-layer is added as a substrate behind the stacked FR4 substrate to enhance the gain and bandwidth of return loss of the proposed dual-band CP antenna. Finally, the bandwidth of return loss and gain of the dual-band CP antenna with an air layer are strongly enhanced.

並列關鍵字

circularly polarized antenna ； dual-band ； QUAD-EMC structure

參考文獻

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