Abstract
A novel method for tapered rectangular dielectric rod antenna design is presented. This method can be used to design from millimetre to terahertz antennas. The work modes of antenna have been analysed. The input modes are fundamental mode and second mode, and the end-flre mode is only fundamental mode. The calculation formulas for bottom diameter and top diameter are given according to the work modes. In order to avoid standing wave in the antenna, the wave will not re∞ect on the boundary surface of antenna. The calculation formula of antenna length is given based on the radial theory. Difierent shaped 300GHz antennas have been designed based on the method. The results indicate that this method is suitable for difierent shapes of rectangular rod antennas. We also give the other two 1THz and 32GHz antenna design to demonstrate this method. The antenna gain will increase with the length expanding based on our design. The bottom and top diameters can be tuned slightly because the work mode formulas of rectangular dielectric waveguide are derived approximately. As an example difierent tuning designs of 100GHz indicate that the tuning region is based on the calculation results. The design results have ultra wide bandwidth which is almost 50% of centre frequency and high gain.
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