A Twelve-Element Sequentially Rotated Array for Circular Polarization Links at 5.8 GHz

The paper presents a hexagonal 12-element array working at 5.8 GHz. The proposed device operates in circular polarization exploiting the sequential rotation architecture. The antenna elements are disc patches and modal degeneration is enforced to attain circular polarization at element level. A hexagonal sub-array is well-suited to be packed in planar space-filling arrangement, as well as in assembling truncated icosahedron, one of the Archimedean solids which are ideal shape for smart antennas with omnidirectional angle spatial coverage. A single layer via-less prototype is simulated considering a commercial FR408 substrate. A realized gain up to 11.6 dBi with a polarization purity exceeding 30 dB at 5.8 GHz is observed.