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A novel planar ultrathin electronically steerable parasitic array radiator (ESPAR) is presented in this paper. Through theoretical analysis of the electric fields of orthogonally crossed dipoles in phase quadrature, it is found that the crossed dipoles radiate linearly polarized wave with a rotational electric field in the azimuth plane. This characteristic is then utilized to design a planar crossed...
This paper presents one fully integrated active folded reflectarray with wide-angle beam steering capabilities and one beam-switching array-fed reflector antenna for future wireless communications at millimetre-wave frequencies. Design concept of the antenna elements and arrays in each case are explained with simulation and experimental results.
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