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This paper presents and investigates broadband circularly polarized (CP) printed crossed dipole antenna and its arrays. The proposed antenna comprises a pair of crossed fan-shaped dipoles, two kinds of parasitic elements, and a reflector with two vertical side walls. A three-quarter circular phase shifter connected to the fan-shaped arms of this antenna allows it to radiate CP waves due to the excitation of the arms and the creation of sequential phases in them. The significant contribution of this work is the creation of electromagnetic coupling between the crossed fan-shaped dipoles and parasitic elements to improve the purity of CP radiation and increase the axial ratio (AR) bandwidth. The proposed antenna has upgraded into 4-element and 8-element array models as cellular base station antennas for PCS/DCS/UMTS systems. The experiments indicate that the proposed CP antenna achieves an impedance bandwidth of 57% (1.47-2.65 GHz) for VSWR &#x003C; 2, an AR bandwidth of 33% (1.65-2.3 GHz) for AR &#x003C; 3 dB, and a gain of 7.8-8.7 dB. The implemented arrays of 1&#x00D7;4 and 1&#x00D7;8 arrangement achieve peak gains of 13.2 and 16.1 dB, respectively. The horizontal half-power beam widths (HPBWs), horizontal axial ratio beam widths (ARBWs), and front-to-back ratios (FBRs) for antenna arrays are around 64&#x00B0; &#x00B1; 3&#x00B0;, more than 90&#x00B0;, and higher than 25 dB, respectively.

Broadband Circularly Polarized Printed Crossed-Dipole Antenna and Its Arrays for Cellular Base Stations