Investigation of reduced height dual-polarized Archimedean spiral antennas with unidirectional radiation patterns

A compact dual-polarized Archimedean spiral antenna is further investigated in terms of its axial dimension. The spiral antenna is center-fed and capable of generating two orthogonal circularly polarized waves over a shared frequency bandwidth. Parametric studies are performed to examine the impact of the antenna heights on the frequency responses of the dual-polarized Archimedean spiral antennas.