Antenna array of wide-band dual-polarization all-metal radiators for mobile communication systems

A novel modification of the all-metal dual-polarization radiator based on crossed dipoles is proposed for broadband antennas of base station for modern mobile communication systems. The Bezier curves of 3rd order were used for approximation of the dipole arm profile, which provide fine-tuning of the crossed dipoles mutual coupling and expansion of the operating frequency band during multi-variable optimization of the dipoles without complication of the radiator design. The developed radiator has high impedance matching and ports isolation in the frequency band 1.35-2.85 GHz, which exceeds the octave. In this range, the reflection coefficients of the coaxial ports is less than |S11|, |S22| < -17 dB, and the isolation |S21| < –30 dB. The radiation pattern of the antenna element has a stable symmetrical shape in the operational frequency range. The beam width in horizontal plane is 122°…134° for the level -10 dB, side lobe level is less than -20 dB and cross polarization component is -20 dB. High performance of the 8-element linear antenna array of this type of dipoles has been studied and confirmed. The proposed modification of the antenna can be used in other frequency ranges, as well as in multi-band and multi-beam antenna systems.