一种小型宽带双极化5G基站天线

A miniaturized broadband dual-polarized antenna for 5G base station

摘要:

设计了一种适用于2G/3G/4G/5G移动通信的小型宽带±45°双极化基站天线。该天线由2对偶极子辐射片、2条微带馈线和1块反射板组成，辐射臂和微带馈线采用双面印刷工艺印刷在0.8 mm厚的FR4板，并固定放置于开有圆形槽的反射板上。对天线实物进行加工测试，测试结果表明，端口1工作频段为1.82~3.60 GHz，端口2工作频段为1.64~3.41 GHz；工作频段内，反射系数小于-10 dB，端口隔离度优于18 dB；交叉极化比在视轴方向大于17 dB，±60°方向大于15 dB；半功率波束65°左右，前后比优于18 dB，测试和仿真结果较吻合。所设计天线带宽宽，尺寸小，且制作工艺简单，成本低廉，适合批量生产，应用于5G移动通信基站中。

Abstract:

A ±45° dual-polarized base station antenna with a small size and a broad bandwidth for 2G/3G/4G/5G mobile communication is proposed in this paper. The proposed antenna comprises two pairs of dipole radiation patches, two microstrip feedlines and a reflector. The radiation patches and microstrip feedlines are printed on a FR4 substrate with a thickness of 0.8 mm, using a process called double-sided printed circuit board. The reflector is grooved a circular slot and the antenna is fixed above it. The prototype of the proposed antenna is fabricated and measured. The results show that it has a bandwidth of 1.82~3.60 GHz(port1) and 1.64~3.41 GHz(port2) respectively, during which, the reflection coefficient is less than -10 dB, the port isolation is better than 18 dB, the cross polarization discrimination is better than 17 dB in the boresight direction, and better than 15 dB in ±60° directions, the half power beam width is approximately 65° and the front-to-rear ratio is better than 18 dB. With the advantages of wide bandwidth, small size, simple manufacturing process and low cost, the proposed antenna is suitable for mass production and is an excellent candidate for applications in 5G mobile communication base station.