| 摘要: |
| 设计了一种用于卫星通信的低剖面宽波束双圆极化扫描阵列天线。天线阵元采用十字形贴片的形式，使用改进的共面耦合探针结构来实现较好的匹配性能并降低剖面高度。在天线阵元4个角放置矩形金属块，用于改善天线的波束宽度。在天线底部增加了匹配网络，引入非辐射模式，实现了双谐振，进一步优化了天线的阻抗带宽。该天线阵元实现了可覆盖频段（上行：889~904 MHz，下行：934~949 MHz）的阻抗带宽，在频段内大于92°的半功率波束宽度，同时实现了大于5 dBi的峰值增益，且天线的剖面高度仅为0.03│霜0。采用矩形栅格布阵将该阵元组成8×8阵列，最终可实现俯仰60°下17.56 dB的可实现增益覆盖，波束扫描至60°时，可实现增益的扫描下降都在4.5 dB以内，且不同扫描角度下阵列轴比小于3 dB。该天线可用于运营商LTE band8频段的卫星通信。 |
| 关键词: 卫星通信 阵列天线 低剖面 宽波束 双圆极化 LTE band8频段 |
| DOI：10.20079/j.issn.1001-893x.240711003 |
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| 基金项目: |
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| Design of a Low-profile Wide-beam Dual Circularly Polarized Scanning Array for Multi-beam Controlling |
| WANG Li,DU Chunye,DANG Huan,JIN Bochuan |
| (1.AVIC Xi揳n Aeronautics Computing Technique Research Institute,Xi揳n 710068,China;2.Guangzhou Institute of Technology,Xidian University,Guangzhou 510555,China) |
| Abstract: |
| A low-profile and wide-beam dual circularly polarized scanning array antenna is designed for satellite communication terminal equipment.The antenna array element takes the form of cross-shaped patch,and uses the improved coplanar coupling probe structure to achieve better matching performance and reduce the profile height.Rectangular metal blocks are placed at the four corners of the antenna element to improve the beam width of the antenna.A matching network is added at the bottom of the antenna,and a non-radiating mode is introduced to achieve dual resonance in the frequency band,which further optimizes the impedance bandwidth of the antenna.The antenna array element realizes the impedance bandwidth of the coverage frequency band (uplink:889~904 MHz,downlink:934~949 MHz),the half-power beam width greater than 92° in the frequency band,and the peak gain greater than 5 dBi,and the profile height of the antenna is only 0.03│霜0.Using the method of rectangular grid array arrangement,the array elements are formed into 8×8 array,which can finally achieve 17.56 dB realized gain coverage at 60 ° elevation.When the beam is scanned to 60°,the scanning reduction of gain is within 4.5 dB,and the array axial ratio is less than 3 dB at different scanning angles.The antenna can be used for operators LTE band8 satellite communication. |
| Key words: satellite communication antenna array low profile wide beam dual circularly polarized LTE band8 |
