基于环形极子的太赫兹超宽带圆极化阵列天线

Terahertz UWB Circularly Polarized Array Antenna Based on Ring Monopole

以方环单极子天线为基础,设计了一种太赫兹频段超宽带圆极化微带阵列天线。提出的新型低剖面环形天线单元由C型结构和改进后的接地结构组成,实现了天线表面电流不对称流动以及电流的最优纵横比,辐射圆极化波;采用2×4天线阵列不仅提高了天线增益,而且增强了其方向特性。仿真结果表明,该阵列天线的阻抗带宽为67.42%(193.86~391.02 GHz),圆极化轴比带宽可完全包含该频段,且在该频段内峰值增益为15 dBi,在太赫兹通信设备中具有广阔的应用前景。

Based on the square ring monopole antenna element, an ultra wideband circularly polarized microstrip array antenna in terahertz band was designed. By changing the structure of the ring antenna element, the current on the antenna surface could flow asymmetrically, and the circularly polarized wave radiation could be realized by changing the aspect ratio of the current using triangular perturbation. Using 2×4 antenna array not only increased the gain of the antenna, but also optimized the directional characteristics of the antenna. The simulation results show that the antenna array operates at 193.86~391.02 GHz, the relative bandwidth is 67.42%, and the maximum gain can reach 15 dBi. It has a good application prospect in terahertz communication.