Photoconductive THz Antennas

被引：0
|
作者：
Khiabani, Neda [1 ]
Huang, Yi [1 ]
Shen, Yao-chun [1 ]
Sajak, Aznida Abu Bakar [1 ]
机构：
[1] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England
来源：
2013 LOUGHBOROUGH ANTENNAS AND PROPAGATION CONFERENCE (LAPC) | 2013年
关键词：
THz CW system; THz photoconductive natenna; THz photomixer antena; THz pulsed system; TERAHERTZ; GAAS; PHOTOMIXERS; GENERATION; RADIATION; POWER;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Terahertz (THz) antennas based upon photoconduction techniques in THz pulsed and continuous-wave (CW) systems are introduced and compared. It is addressed that the differences in the excitation of these antennas lead to different design requirements. In both antenna types, optical-to-electrical conversion efficiency is very low - this means that employing techniques which can enhance the generated THz photocurrent in the antenna gap is necessary. Comparison of impedance matching of these antennas demonstrates that matching efficiency is a much more severe problem in a CW system than in a pulsed system. Regarding the coupling of the THz wave to the air, both antenna types suffer from low radiation efficiency due to the losses in photoconductive substrate. Considering these analyses, a simplified block diagram on how different parameters can improve the radiated THz power and efficiency is presented and finally a new THz photomixer solution with improved performance is demonstrated.
引用
收藏
页码：307 / 310
页数：4
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