A new singly-fed bidirectional wideband circularly polarized cylindrical dielectric resonator antenna (CDRA) using modified J-shaped ground plane is investigated and presented in this paper. The designed antenna excited by a single microstrip feed line with the modified Jshaped ground plane, which supports the orthogonal mode generation i.e. HEM 11δ mode for realizing circular polarization (CP). Measured results show that the proposed antenna achieved S 11 ≤ -10 dB, input impedance bandwidth of

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... 41.44% (centered at 3.74 GHz) and 3-dB axial ratio bandwidth in broadside direction of 29.91% (centered at 3.61 GHz). The average measured gain and simulated radiation efficiency in broadside are 2.84 dBic and 94.69% respectively, throughout the working band. The proposed CPDRA is a bidirectional radiator, and the radiation patterns on both sides are nearly the same. The antenna radiates left-handed CP wave in +z-direction and right-handed CP wave in -z-direction for both the resonance frequencies, which has been confirmed by plotting CP radiation pattern. The presented design can be used for GHz) and LTE3400 (3400-3800 MHz) bands.