A WIDEBAND WIDE-STRIP DIPOLE ANTENNA FOR CIRCULARLY POLARIZED WAVE OPERATIONS

A thin dipole antenna is a well-known antenna with linearly polarized wave operation. In this work, a wide-strip dipole antenna is proposed for circularly polarized wave operations. To obtain circularly polarized (CP) wave operations, there are two conditions to be satisfled. One is that the antenna must have two degenerated orthogonal modes with difierent resonant frequencies. The other is that the phase difierence of two orthogonal modes is 90 degrees. To match the flrst condition, the slab width W is tuned to generate current distributions directed in two difierent directions. In addition, the second condition is matched by asymmetric feeding point by adjusting the overlapped square width C. The parametric study is completed by the Ansoft HFSS simulator. Simulated results reveal that the CP wave is mainly in∞uenced by the slab width W. The in∞uences of the parameters C and d on the performances of the proposed antenna are also investigated in this paper. Taking i8dB as reference, there are two working bands for this proposed antenna and the measured center frequencies are 0.66GHz and 2.04GHz, respectively, and the corresponding bandwidths are 0.27GHz (40%) and 1.78GHz (87%), respectively. In addition, the measured center frequencies and bandwidths of the axial ratio are 1.94GHz and 0.53GHz (27%), respectively.