A Miniaturized GNSS Antenna with Bandwidth Broadening

A miniaturized patch antenna loaded with split-ring resonators (SRRs) and modified reactive impedance surface (RIS) is proposed and present. Four sequentially rotated SRRs around the patch of antenna improve the impedance and the axial ratio bandwidth, the modified RIS which with a balanced slots can miniaturize the antenna size and the circularly polarized radiation is achieved by an asymmetric cross slot cut along the orthogonal directions in the center of patch over RIS. The measured results of the proposed antenna are 3.2% (2.44--2.52 GHz) for 3-dB axial ratio bandwidth, 7.8% (2.40--2.595 GHz) for 10-dB return loss bandwidth, and 2.48 dBi for gain at the boresight. The overall antenna volume is 0.27 λ0 x 0.27 x λ0 0.03 x λ0 on a low cost F4B substrate at 2.49 GHz.