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In this paper focusing properties of collimator based on modulated metal-dielectric spiral structure are investigated using a new efficient algorithm for calculating the radiation pattern.
Different kinds of spiral planar circularly polarized (CP) antennas are presented. These antennas are based on an interaction between a cylindrical surface-wave excited by an omnidirectional probe and a inhomogeneous surface impedance with a spiral pattern. The surface impedance interaction transforms a bounded surface wave into a circularly polarized leaky wave with almost broadside...
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