Planar Archimedean spiral antenna is widely used with its low profile, light weight, high efficiency, circular polarization and broad bandwidth. In this paper, the effects on the electromagnetic characteristics of the planar Archimedean spiral antenna, which are owing to the changes of the diameter and the heights of the transmutative cavity and the width of the spiral, are investigated respectively. Results show that the changes of the diameter and the heights of the transmutative cavity have much influence on the input impedance and the gain of the Archimedean spiral antenna, while the changes of the width of the spiral have much influence on the input impedance of the Archimedean spiral antenna.
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