A dual-band circularly polarized antenna, for applications of a global navigation satellite system (GNSS), is designed. The proposed antenna can generate two frequency bands, covering L1 [1.563 - 1.587] GHz and L2 [1.215 - 1.2396] GHz GPS bands with a Right-Hand Circular Polarization (RHCP). To achieve a resonance at two distinct frequency bands, we have used the concept of a stacked antenna combined with a single feed. The S11 of the proposed antenna is less than ？10 dB at the upper and lower bands. The gain is 7.6 dB at 1.227 GHz and 9.4 dB at 1.575 GHz. Circular polarization is obtained by using the truncated corner technique. We have obtained an axial ratio of less than 1 dB at 1.227 GHz and 1.575 GHz. For the design and optimization of antenna, we use CST MWS software.
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