Single-Feed, Compact, GPS Patch Antenna Using Metasurface

This paper proposes a single-feed, compact, metasurface-based antenna with circularly-polarized (CP) radiation for the Global Positioning System (GPS) receivers. The antenna consists of a square patch on the metasurface, which is a periodic lattice of 4 x 4 square metallic patches arranged on a grounded dielectric substrate. The CP radiation is obtained by truncating corners of the patch radiator. The truncated-corner square patch on the metasurface structure is used to achieve an antenna miniaturization. The final design, with a size of 60 x 60 x 4.0 mm(3) (0.315 lambda(o) x 0.315 lambda(o) x 0.021 lambda(o) at the GPS L1 frequency) yields a bandwidth for vertical bar S-11 vertical bar < - 10 dB of 1.562 - 1.733 GHz (171 MHz) and 3-dB axial ratio (AR) bandwidth of 1.570 - 1.592 GHz (22 MHz). At 1.58 GHz, the proposed antenna yielded a gain of 2.75 dBic and a 3 dB AR beamwidth of 138 degrees and 144 degrees in the x-z and y-z planes, respectively.