高辐射强度的带THz扼流圈的偶极天线阵列模拟分析

为了提高太赫兹辐射强度, 设计了带THz扼流圈的偶极天线阵列.模拟结果表明, 增加直线阵的阵元数对平均匹配效率影响很小, 却能线性增加相干辐射强度.加入THz扼流圈可减小进入到传输线的交流分量, 进而减小共振频率的偏移, 使平均匹配效率提升了两倍.相比于网格排列的平面阵, 交错排列的阵元在垂直方向上具有更小的耦合, THz发射谱更窄.通过使用聚酰亚胺透镜代替硅透镜, 可有效提高输入电阻, 并将总效率由25%提高到35%.

Numerical analysis of high radiation intensity dipole antenna arrays with terahertz chokes

To improve terahertz (THz) radiation intensity, the dipole antenna arrays with THz chokes on a thin LT-GaAs film are designed.The output radiation of the proposed linear array can be linearly enhanced by increasing the number of elements, while the average matching efficiency is changed insignificantly.The AC component flowing into the coplanar strip line (CPS) is limited by THz chokes which leads to a more stable resonant frequency, and the average matching efficiency is twice that of an array without chokes.We find the staggered array has a narrower emission spectrum than the gridding one due to the coupling of adjacent elements in the vertical direction.By designing the array on a polyimide lens instead of a silicon lens, a high input resistance can be obtained, and the total efficiency is raised from 25% to 35%.