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DUAL CIRCULARLY POLARIZED RADIAL LINE SLOT ANTENNA

A dual circularly polarized radial line slot antenna (RLSA), built up on a very thin parallel-plate waveguide cavity, is here proposed and analyzed. The antenna radiating surface consists of several concentric arrays of crossed slots etched on the upper waveguide plate. This configuration allows to radiate both a symmetric left-hand (LHCP) and right-hand (RHCP) circularly polarized wave by properly exciting corresponding rotational field inside the cavity. The exciting fields are launched through a concentric annular slot cut on the lower waveguide plate and fed by four microstrip lines with identical amplitudes and 90° rotating phases. A simple planar network provides the required clockwise/anticlockwise phasing at the four microstrip ports. Input S-parameters behavior and antenna radiation performances have been simulated in the 9.5 to 10.5 GHz frequency range.