无线局域网的双频圆极化圆环缝隙天线设计  

Design of dual-band circularly polarized annular slot antenna for wireless local area network applications

作　　者：任王[1] 邓俊勇[2] 洪少华[2] 陈抗生[2] 

机构地区：[1]浙江工商大学信息与电子工程学院,浙江杭州310018 [2]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第8期1306-1309,1315,共5页Journal of Zhejiang University：Engineering Science

摘　　要：通过分析与改进传统圆环缝隙天线，提出了一种用于无线局域网（WLAN）的小型双频圆极化缝隙天线．天线的底层由接地面的2个圆环缝隙组成，圆环之间用2条矩形切口连接，确保能量由外到内传递．介质基板采用FR-4材料，顶层由50Q开路微带线馈电，天线大小为40mm×40mm．给出了天线的阻抗带宽、辐射方向、圆极化率及最大增益的仿真曲线．仿真结果表明，天线能够完全覆盖WLAN工作频段（2．400～2．485，5．150～5．350，5．725～5．825GHz），并且在WLAN频段内圆极化轴比低于3dB，最大增益达到4．8dBi．利用矢量网络分析仪测量了天线实物的阻抗带宽，测试数据与仿真结果十分吻合．A compact dual-band circularly polarized annular slot antenna for wireless local area network （WLAN） applications was proposed through analyzing and improving the traditional annular slot antennas. The proposed antenna is composed of two annular slots on the ground plane with the size of 40 mm by 40 mm. Two notches are placed between the annular slots to guarantee that the energy flows into the inner annular slot. The substrate material is FR-4. The antenna is fed by a 50 Ω microstrip at its top. The impedance bandwidth, radiation pattern, axial ratio and peakgain of the antenna were simulated. The results showed that the antenna completely covered the WLAN bands （2. 400-2. 485, 5. 150-5. 350, 5. 725- 5. 825 GHz） with the axial ratio lower than 3 dB, and the peakgain could reach about 4.8 dBi. The antenna was fabricated and its impedance bandwidth was tested by the vector network analyzer to validate the simulation results. The measured data agreed very well with the simulation results.

关 键 词：圆环缝隙天线 双频 圆极化 无线局域网(WLAN) 

分 类 号：TN821.4[电子电信—信息与通信工程]