Woo Insang, Nguyen Truong Khang, Han Haewook, Lim Hanjo, Park Ikmo
Department of Electrical and Computer Engineering, Ajou University 5 Wonchon-dong, Youngtong-gu, Suwon 443-749, Korea.
Opt Express. 2010 Aug 30;18(18):18532-42. doi: 10.1364/OE.18.018532.
To improve the output power of a photomixer used as a THz source, we propose a four-leaf-clover-shaped antenna structure composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were first investigated on a half-infinite substrate as a simplified radiation environment to reduce the computation time. Based on the antenna characteristics on that half-infinite substrate, the antenna structure was designed to have a maximum total efficiency and a maximum directivity on an extended hemispherical lens. The input resistance of this structure was six times that of a full-wavelength dipole, significantly improving the mismatch efficiency between a photomixer and the antenna. The terahertz output power from this structure is expected to be 2.7 times that of a full-wavelength dipole.
为了提高用作太赫兹源的光混频器的输出功率，我们提出了一种由高谐振辐射元件和稳定直流馈电元件组成的四叶草形天线结构。首先在半无限大基板上研究了该结构的谐振特性，作为简化的辐射环境以减少计算时间。基于该半无限大基板上的天线特性，设计了一种在扩展半球形透镜上具有最大总效率和最大方向性的天线结构。该结构的输入电阻是全波长偶极子的六倍，显著提高了光混频器与天线之间的失配效率。预计该结构的太赫兹输出功率是全波长偶极子的2.7倍。
