利用堆疊槽孔環結構設計寬頻圓形極化天線

本篇論文主要是在RFID頻段上(UHF band; 0.858GHz-0.96GHz)，探討堆疊槽孔環結構對貼片天線的影響，進而改善天線增益及圓形極化，並在加大堆疊槽孔環外圍尺寸時，對天線既有的特性的變化加以探討。利用環型槽孔堆疊於貼片天線上，其此環型槽孔是蝕刻於FR-4上，兩結構之間以空氣為介質，其間隔的空氣層約0.1波長，藉此使堆疊的槽孔與貼片天線耦合產生具有寬頻圓形極化及高增益之特性。在實際量測下的堆疊槽孔天線特性與電磁模擬軟體分析結果雷同，其特性如下：阻抗頻寬(小於10dB)為20.3%(0.84GHz-1.03GHz)，3dB的軸比頻寬8.7%(0.88GHz-0.96GHz)，而天線增益大於6dBic以上的頻寬亦有11.9% (0.87GHz-0.98GHz)，其涵蓋操作頻率範圍內的3dB的波束寬度均在 ±20°。

關鍵字

圓形極化； RFID天線；無線射頻辨識； patch天線；天線增益

並列摘要

A method is proposed to enhance the Return-Loss and axial-ratio bandwidths for a probe-fed circularly polarized microstrip patch antenna. The patch is stacked by a slot-ring at a distance of 0.1λ in free space. By shifting the relative positions between the patch and the ring, 8.6% axial-ratio bandwidth can be achieved from 0.88GHz to 0.96GMHz, the gain is higher than 6dBic within this bandwidth.

並列關鍵字

CP ； patch antenna ； RFID

參考文獻

[1] R. Want, “An Introduction to RFID Technology,” IEEE Pervasive Computing, vol. 5, no. 1, pp. 25-33, January 2006.

[2] K. R. Carver and J. W. Mink, “Microstrip antenna technology,” IEEE Trans. Antennas Propag., vol. 29, pp. 2-24, January 1981.

[4] B. Y. Toh, R. Cahill, and V. F. Fusco, “Understanding and measuring circular polarization,” IEEE Trans. on Education, vol. 46, no. 3, pp. 313-318, August 2003.

[5] Z. N. Chen, X. Qing, and H. L. Chung, “A universal UHF RFID reader antenna,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 5, pp. 1275-1282 , May 2009.

[6] Giuseppe De Vita and Giuseppe Iannaccone, “Design Criteria for the RF Section of UHF and Microwave Passive RFID Transponders ,” IEEE Transactions On Microwave Theory And Techniques, vol. 53, no. 9, September 2005.

國際替代計量

利用堆疊槽孔環結構設計寬頻圓形極化天線

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