科研之友
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摘要
In order to overcome the shortcomings of the scanning antenna that is used in the current terahertz scanning imaging technology, a rectangular wave-guide antenna with inclined slits in the narrow side which can achieve one-dimensional frequency scanning is designed. Through applying the equivalent circuit method and the Taylor line array method for designing slit antenna, the initial parameters such as slit spacing, slit width, slit length, slit inclination and slit number are estimated. Then, simulation and optimization are done in the ANSOFT-HFSS software. Finally, the antenna which is suitable for 0.101~0.111 THz bandwidth is achieved. The simulation results show that the antenna transmits or receives different frequencies according to different angles in bandwidth in the extending direction of wave-guide so that it can accomplish frequency scanning. Scanning range is about 6.1°. The gain of main lobe is higher and the difference between the main lobe level and minor lobe level at every frequency point is larger. The antenna has advantages of compact structure, small volume, light weight, low cost, faster scanning, which provides a certain application value for the terahertz scanning imaging technology.
