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

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

Blog Article

This study 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 sidewalls.A three-quarter circular phase shifter connected to the fan-shaped arms of this antenna allows it to radiate CP waves owing to the excitation of the arms Ball - Coach Aids and the creation of sequential phases.

The significant contribution of this study is the creation of electromagnetic coupling between 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.Experiments indicate that the proposed CP antenna achieves an impedance bandwidth of 57% (1.

47-2.65 GHz) for VSWR < 2, an AR bandwidth of 33% (1.65-2.

3 GHz) for AR < 3 dB, and a gain of 7.8-8.7 dB.

The implemented arrays of $1 imes 4$ and $1 imes 8$ 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 Evening gowns ratios (FBRs) for the antenna arrays are approximately 64°± 3°, > 90°, and > 25 dB, respectively.