Abstract
The photoconductivity antenna is a promising technology to generate THz wave. However, the technology is problematic in THz low antenna gain. The improvement of efficiency and directive is very important to the photoconductivity antenna. Here, a super directivity THz photoconductivity antenna (PCA) is proposed. The antenna uses the dielectric resonator to enhance the directivity which yields the super directivity in radiation. The eigen mode analysis is performed to the super directivity antenna, which is used to help design the antenna and understand the mechanism for the super directivity. The spherical cap is used as the dielectric resonate antenna (DRA), and the relationship between the radius of sphere and the height of cap and super directivity is surveyed. The dielectric cap height and sphere radius are found both playing an important role in enhancing the directivity of the antenna. To validate the proposed design, a THz photoconductivity antenna is designed. The simulations are performed using FDTD and FEM method. Both results show that the designed THz antenna has the super directivity value above 9.0 at 2.0 THz.
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