A small-size broadband circularly polarized microstrip antenna array is proposed in this article. The array has four broadband dual-feed U-slot patch antenna elements with circular polarization, and the sequential feeding technique is used to further enhance the 3?dB axial ratio bandwidth. The lateral size of the fabricated array is as small as , and the profile is only . Measured results show that the overlapped ?10?dB reflection coefficient and the 3?dB AR bandwidth is 53%, and the variation of the measured realized gain is less than 1?dB for -band satellite communications (1.98–2.2?GHz).
展开▼
