小型化双频印刷缝隙天线

Miniaturized dual band printed slot antenna

针对无线通信系统中的多频段传输天线的小型化问题,设计了一种由L型微带线馈电的小型化缝隙天线。通过在地平面上开三个阶梯组成一端开口的缝隙切断电流路径,从而实现WLAN频段的双频带覆盖。运用电磁仿真软件对天线进行参数仿真和优化分析,通过改变缝隙的长度和宽度来实现天线同时工作在2.45和5.8 GHz。结果表明天线端口回波损耗S≤-10 dB以下工作带宽分别为2.4~2.49 GHz和5.48~6.1 GHz,满足IEEE802.11 b/g和IEEE802.11 a/n标准。同时对天线进行实物制作并进行端口回波损耗、增益和辐射方向图测试,仿真结果与测试结果比较吻合。相较于传统平面缝隙天线,本文提出的天线尺寸紧凑且结构简单,易于加工并与电路良好集成,具有广泛的通信应用前景。

In view of miniaturization of multi band transmission antenna in wireless communication system, this paper presents a miniaturized slot antenna, which is fed by L-shaped microstrip line, a slot with an opening at one end formed by three steps on the ground plane to cut off the current path, so as to realize dual-band coverage of WLAN band. The electromagnetic simulation software is used to simulate and optimize the parameters of the antenna, by changing the length and width of the slot, the antenna can work at 2.45 GHz and 5.8 GHz at the same time, the results show that the antenna port return loss S≤-10 dB, and the working bandwidth are 2.4~2.49 GHz and 5.48~6.1 GHz respectively, which meet the requirements of IEEE802 11 b/g and IEEE802 11 a/n standards. Meanwhile, the antenna is fabricated, and the port return loss, gain and radiation pattern are tested, the simulation results are in good agreement with the test results. Compared with the traditional planar slot antenna, the antenna proposed in this paper is compact in size, simple in structure, easy to implement and well to integrate with the circuit, which hopes a wide range of communication applications in the future.