This article presents a rectangular patch antenna designed to work at Global Positioning System and C frequency bands. The dual-band operation is obtained by combining the capacitivecoupled coplanar waveguide with the reactive loading method, which consists of a circular slot etched on the rectangular patch. This latter was designed first to resonate at the principal frequency f 10 then a circular slot was etched on the radiator to enhance the electric characteristics of the secondary frequency f 30 . The simulated and fabricated antenna resonates at 1.575 and 4.6 GHz. The achieved work shows a good concordance between the simulated and experimental results.