A bow-tie antenna on the extended hemispherical lens for THz frequency

Nowadays, the band resources are increasingly scarce, showing a tendency toward situation, terahertz band gradually attracts people's discussion. However, it work in the high frequency, relatively wavelength is small and electromagnetic wave loss is very large, design and performance of the antenna structure must has some special requirements. In this article, we propose an antenna working in the terahertz band, which is bow-tie antenna coupled through an extended hemispherical lens to obtain high gain. This antenna is designed at 300GHz, and changed the structure to get the wider operating bandwidth which can reach 38%. By studying the size of expanded hemispheric lens, the antenna has a good directivity, which can meet the design requirements in terahertz band.