本文提出了一款高增益、低旁瓣的 L型波纹太赫兹喇叭天线。该天线工作于太赫兹第一个大气窗口, 由波导段、模式变换段和辐射段三部分组成, 在模式变换段和辐射段内壁引入波纹结构, 利用控制变量法分析 L型波纹喇叭天线模式变换段的波纹数目和辐射段每个波长内的周期数目对天线辐射特性的影响。分析结果表明: 该波纹喇叭天线在工作频率为 320～380 GHz范围内增益均大于 21.7 dB, 其 3 dB主瓣宽度都小于 15.2°。该天线满足高增益、低旁瓣的要求, 适用于太赫兹通信系统。

This paper presents a high gain, low sidelobe terahertz horn antenna with L type corrugation. The antenna, which works in the first atmospheric window, is composed of three parts, the waveguide section, the mode conversion section and the radiation section. The corrugated structure is drawn into the inner wall of the mode conversion section and the radiation section. The influence of corrugation number of mode conversion section and the period number of the wave length of the radiation section on the radiation characteristics are analyzed using the control variate method. Analysis results show that the gain of the corrugated horn antenna is greater than 21.7 dB and the 3 dB main lobe beamwidth is less than 15.2° in the working frequency range of 320-380 GHz. The antenna meets the requirement of high gain and low sidelobe which is suitable for Terahertz communication system.