文中提出了一种具有低互耦和低相关性的双圆形微带贴片阵列天线。阵元间加载两个对称放置的类E 型电磁带隙结构,利用其带隙特性抑制表面波传播,降低阵元间的互耦。此外,在阵元间地板上刻蚀两组方形缝隙缺陷地结构,抑制地面耦合电流,从而进一步减小互耦和相关性。所提出的阵列天线工作在5. 8 GHz 频段,单元间的最小距离仅为0. 19λ。理论分析和实验结果表明:在工作频段内,所设计的阵列天线互耦下降超过39. 4 dB,包络相关系数低于0. 001 5,在天线尺寸较小且辐射性能良好的前提下实现了较好的去耦效果。

A novel dual-circle microstrip patch array antenna with quite low mutual coupling and correlation is proposed in this paper. Two deformed E-shaped electromagnetic bang gap structures are symmetrically inserted between two circular antenna elements, which could suppress the surface waves propagation and decrease the envelope correlation coefficient (ECC). In addition, several rectangular slot defected ground structures are symmetrically etched on the ground plane to curb the ground coupling current. Thus the mutual coupling and correlation are further decreased. The shortest distance between the two circular antenna elements is only 0. 19 λ, where λ is the wavelength at the working frequency of 5. 8 GHz. Both the simulated and experimental results indicate that the mutual coupling reduction is more than 39. 4 dB and the ECC value is less than 0. 001 5. Decoupling effect can be achieved by the proposed decoupling antenna within its small size and good radiation performance.

TN821

南京航空航天大学研究生创新基地(实验室)开放基金资助课题(kfjj20201501)