CST – Computer Simulation Technology

Effects of Substrate on the Performance of Photoconductive THz Antennas
Di Li, Yi Huang, Yao-Chun Shen, Neda Khiabani
International Workshop on Antenna Technology (iWAT), 2010
March 2010
1 - 4
Photoconductive antennas have been widely used to generate and detect THz waves in recent years. Because the thickness of the substrate is usually larger than the wavelength of THz waves, surface/ substrate modes may be generated and the effect of the substrate cannot be ignored – this has not been properly investigated. This paper is therefore to investigate this problem using a numerical simulation tool (CST Microwave Studio). The radiation pattern and power of photoconductive antennas with different sizes of substrates are obtained. The results show that the radiated power is sensitive to the dimensions of the substrate: most of the radiated power is radiated towards the substrate side rather than the free space, and a thin substrate is preferred to maximise the radiated power and control the radiation direction

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