It is possible to obtain polarization diversity from one multiple arm logarithmic-spiral antenna. The log-spiral antenna with more than 2 arms can be excited by a single hybrid matrix connected to the antenna terminals at the origin of the antenna geometry, and operated such that currents flow on the arms with phase progression away from the origin and reflected currents flow back along the arms with phase progression toward the origin. These two components of current radiate fields of opposite sense of essentially circular polarization.
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Kim et al. (1971) studied this question.
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