太赫兹科学与电子信息学报, 2019, 17 (3): 430, 网络出版: 2019-07-25  

单馈点宽带圆极化交叉偶极子天线

Single fed wideband circularly polarized crossed dipole antenna
作者单位
西安邮电大学电子工程学院,陕西西安 710121
摘要
基于传统交叉偶极子天线,设计了一款应用于全球定位系统 (GPS)的宽带圆极化天线。该天线用一个 50 .的同轴线给交叉偶极子馈电,通过一对四分之一空置印刷环使振子臂之间形成 90°相位差以产生圆极化辐射。为了拓展阻抗带宽和轴比 (AR)带宽,在耦合贴片上进行切角、开缝处理。Ansoft HFSS仿真结果显示,阻抗带宽 (|S11|<-10 dB)为 66.7%(1.141~2.283 GHz),3 dB轴比带宽为 33.3%(1.347~1.885 GHz)。在工作频段内最大圆极化增益为 8.2 dBi,圆极化特性良好,实现了带宽展宽的目的。
Abstract
Based on the traditional crossed dipole antenna, a wideband circular polarization antenna used in Global Positioning Systems(GPS) is designed. The crossed dipole is fed with a 50 . coaxial line. The crossed dipole can produce circularly polarized performance because of the orthogonal arms of dipoles with the phase difference of 90° due to a pair of vacant-quarter print rings. To achieve a broader impedance bandwidth and Axial Ratio(AR) bandwidth, the coupling patch is cut and slotted. Simulation results in Ansoft HFSS show that the antenna has an impedance bandwidth(|S11|<-10 dB) of 66.7% (1.141-2.283 GHz) and a 3 dB bandwidth of 33.3%(1.347-1.885 GHz). It has the maximum circular polarization gain of 8.2 dBi at the operating bandwidth. It has good circular polarization characteristics and the bandwidth can be expanded.

商锋, 韩娇娇. 单馈点宽带圆极化交叉偶极子天线[J]. 太赫兹科学与电子信息学报, 2019, 17(3): 430. SHANG Feng, HAN Jiaojiao. Single fed wideband circularly polarized crossed dipole antenna[J]. Journal of terahertz science and electronic information technology, 2019, 17(3): 430.

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