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A novel dual-band circularly-polarized (CP) CPW-fed slot antenna is proposed in this communication. This antenna characterizes a small frequency ratio and wide CP bandwidths. The dual-band operations are realized by using two parallel monopoles, one curved monopole and one fork-shaped monopole. In addition, a crane-shaped strip is placed in the ground plane to achieve circular polarization. The experimental results show that the antenna has the axial ratio bandwidths of 9% for the lower band and 11% for the upper band. Both bands are left handed. The frequency ratio of the upper band to the lower band is 1.286 (1.98 GHz/1.54 GHz). Other characteristics such as impedance bandwidths, radiation patterns and gains will also be presented.