A novel composite-fed wide-beam circularly polarized rectangular dielectric resonator antenna (DRA) is proposed. The feed structures of the proposed antenna are divided into a rectangular slender slot fed by a microstrip line and a pair of printed metal strips bent at right angles. The slender rectangular slot excites TE y 1δ1 mode of the DRA, while the printed metal strips can excite TE x δ11 mode. These two modes can be modeled as horizontally placed magnetic dipoles along y-axis and x-axis, respectively. The 90º phase difference between the two magnetic dipoles can be realized by changing sizes of the printed metal strips, hence a circularly polarized radiation with a wide axis ratio beam width (ARBW) can be generated. In addition, by adjusting size of the DRA to change aperture size of antenna, the half-power beam width (HPBW) can also be broadened. Measured results indicate that its maximum ARBWs in φ=0º and φ=90º planes are 224º and 165º, respectively. ARBWs in both φ=0º and φ=90º planes are not less than 122º, while HPBWs are in the range of 101º to 127º. Finally, its gains are higher than 4.7dBic throughout the wide-beam bandwidth from 4.3 GHz to 4.8 GHz (11%).