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针对连续太赫兹光电导天线辐射功率较低的缺点,利用有限积分方法对三种常用的光电导天线,包括偶极天线、蝶形天线和螺旋天线,进行数值模拟并分析比较其辐射阻抗特性.仿真结果表明,偶极天线的辐射阻抗与偶极长度、宽度、电极间隙以及传输线宽度有关,且在其谐振频率存在峰值阻抗,适用于特定频率的太赫兹波辐射.蝶形天线和螺旋天线在所研究的太赫兹波段具有近似稳定的辐射阻抗,广泛应用于宽带领域.对带有交叉电极的电极间隙进行计算,结果表明由交叉电极引入的附加电容降低了天线的高频阻抗.
Aiming at the shortcomings of continuous THz photoconductive antenna with low radiation power, three common photoconductive antennas including dipole antenna, butterfly antenna and helical antenna are numerically simulated and their radiation impedance characteristics are analyzed and compared by finite integral method. The simulation results show that the dipole antenna’s radiation impedance is related to dipole length, width, electrode gap and transmission line width, and has peak impedance at its resonant frequency, which is suitable for terahertz wave radiation with specific frequency. The studied terahertz band has an approximately stable radiation impedance and is widely used in the field of broadband.Electrode gaps with crossed electrodes are calculated and the results show that the additional capacitance introduced by the crossed electrodes reduces the antenna’s high frequency impedance.