This paper presents the design, simulation, and real-world validation of a compact, dual-band, right-hand circularly polarized antenna for Global Navigation Satellite System (GNSS) applications. The antenna operates in the L1 (1575 MHz) and L5 (1176 MHz) bands, utilizing a stacked patch structure on low-cost FR4 substrates to achieve compactness and circular polarization. The design ensures axial ratio values below 3 dB, with peak gains of 2.59 dBi (L1) and -0.89 dBi (L5), while maintaining wide radiation coverage. Unlike many recent proposals based on Rogers substrates or complex geometries, our design focuses on cost-effectiveness and manufacturing simplicity. The prototype was validated using a Quectel LC29HAAMD GNSS receiver during the 2024 French National Microwaves Days (JNM), successfully acquiring over 40 satellites within 60 seconds in a real-world suburban environment. These results demonstrate the antenna’s suitability for space-constrained and low-cost GNSS platforms in the “New Space” era.
