Circularly polarized chamfer-shaped DRA array

A novel of circularly polarized aperture coupled chamfer-shaped (CS) DRA array, is presented for wideband circular polarization and broad-band matching. The proposed single element achieves 7% 3-dB axial ratio bandwidth. The array structures are built from four closely identical elements to improve matching, gain and enhance circular polarization. The investigated array exhibits 46% broad-band matching and promotes 38% 3-dB axial ratio bandwidth by applying the sequential phase feeding technique. The gain is increased from 6 dB for one element to 10.5 dB for the array. In addition, the radiated field patterns are symmetrical around broad-side direction with side-lobe levels below −15 dB. A radiation efficiency of 87% is achieved at 10 GHz. A 2 × 2 array elements with size of λ
0
× λ
0
at 10 GHz has been investigated and verified using full-wave analysis with good agreements.