A New Ultra-wideband Planar Spiral Antenna

In this paper, a new Ultra-wideband planar spiral antenna which can work in 0.8GHz to 18GHz is presented. The goal of this design is to miniaturize the spiral antenna, so the aperture size of this antenna is strictly restricted. In order to cover the frequency range under the size restriction, several kinds of miniaturization methods are employed. For structural aspects, the antenna uses side feed to reduce longitudinal dimension. The antenna can achieve a VSWR of less than 2.5:1 over the entire 0.8GHz to 18GHz frequency range. Through simulation design and test verification, the antenna has good performance and has the advantages of ultra-wideband, small aperture, easy processing and assembly, etc.