Wideband Wide-scanning Phased Array of U-slot Microstrip Antenna Elements in Triangular Lattice
Wideband Wide-scanning Phased Array of U-slot Microstrip Antenna Elements in Triangular Lattice
复制标题
三角晶格U型槽微带天线单元的宽带宽扫描相控阵
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Huiwen Xu
中科院分区：
文献类型：
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作者：
Binyun Yan;Weixing Sheng;Chenyun Shi;Jie Lu;Huiwen Xu
研究了一种紧凑、宽带、宽扫描的X波段平面微带天线阵。该元件是一种由$500Omega$同轴馈电馈电的低调U形槽微带天线。该阵列以三角形网格排列，以减少单元数。在VSWR=2.5$的情况下，当扫描到$PM 60^{CIRC}$时，无限阵列在E面达到28.9%的带宽，在D面达到28.4%的带宽，在H面达到22.5%的带宽。制作了七个单元的三角形点阵，并进行了测试，结果与模拟结果吻合较好。当驻波比为2.5$时，每个单元的驻波带宽都达到了3 GHz以上。当扫描到所有方位面上的$pm 45^{CIRC}$时，中心单元对于有源VSWR$leq 2.5$获得了超过2.85 GHz的带宽，而一个边单元对于有源VSWR$leq 2.1$获得了超过3.5 GHz的带宽。中心元件的扫描方向图在E面和H面上分别为115和105dB，交叉极化电平小于-30mathbf{dB}。该元件在X波段具有超过5.5dB峰值增益的辐射能力。综合了一个$8×8$阵列的扫描性能，表明H面连接的平面阵列的扫描能力高达$60^{cic}$。
A compact, wideband and wide-scanning planar microstrip antenna array is investigated over X band. The element is a low-profile U-slot microstrip antenna fed by $50Omega$ coaxial feed. The array is arranged in triangular lattice for element number reduction. The infinite array is able to achieve 28.9% bandwidth in E-plane, 28.4% bandwidth in D-plane and 22.5% bandwidth in H-plane when scanning to $pm 60^{circ}$ with VSWR $leq 2.5$. An array of seven elements with triangular lattice arrangement is fabricated and measured, showing satisfying agreement with simulation results. The individual VSWR bandwidth of each element reaches over 3GHz when VSWR $leq 2.5$. The center element achieves over 2.85GHz bandwidth for active VSWR $leq 2.5$ and a side element achieves over 3.5GHz bandwidth for active VSWR $leq 2.1$ when scanning to $pm 45^{circ}$ in all azimuth planes. The measured scanning pattern of the center element illustrates $115^{circ}$ and $105^{mathrm{o}}$ 3dB beamwidth in E-plane and in H-plane respectively, with cross polarization level below $-30mathbf{dB}$. The element is capable of radiation with over 5.5dB peak gain during the X band. The scanning performance of a $8 imes 8$ array is synthesized, showing the ability of scanning up to $60^{circ}$ of a H-plane connected planar array.