Abstract
A circularly polarized wideband omnidirectional array of spiral antennas is presented. It covers the frequency band from 1.2 up to 3.6 GHz while keeping a good $S_{11}$ and an omnidirectional coverage. This array achieved a dual polarization using left- and right-hand Archimedean spiral antennas. The gain of the array is enhanced using a unique cavity for the entire array, and the realized gain is above the maximum theoretical gain of a single spiral antenna.
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