Abstract
An analytical method to estimate the bandwidth of planar phased array of spiral antennas is presented. Three main parameters are considered: circular polarization, reflection coefficient, and sidelobe levels. An application of the method for a planar array of asymmetrical Archimedean spirals is presented for a scan angle of $\theta {= 30^ \circ} $ . The estimated bandwidth and the bandwidth obtained with the simulation results differ in 3.5%.
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