一种具有宽带散射抑制特性的共口径基站天线单元设计OA

The research of miniaturized shared-aperture base station antennas that integrate Multiple Bands and Multiple Arrays(MBMA)have become the main research trend in current base station antenna industry.However,in the process of miniaturizing MBMA antennas,the spacing between radiators of each band is extremely compressed,the resulting electromagnetic coupling induces significant radiation pattern distortion.This paper presents a low-band shared-aperture base station antenna design with wideband scattering suppression characteristics.By integrating split-ring resonator structures on the low-band antenna radiator,the coupling high-band currents can be neutralized,thereby the influence on the high-band's radiation pattern is reduced.The experimental results show that the proposed low-band antenna element has good electrical and radiation performance in the 617～960 MHz band,achieving an impedance bandwidth of 43.5%,in-band polarization isolation of 25 dB and an average gain of(8.0±0.5)dBi.Moreover,pattern distortion in the high-band is effectively avoided,test results show that the proposed antenna exhibits excellent scattering suppression in the 1 700～2 700 MHz band.In conclusion,the proposed shared-aperture dual-band design has improved the performance in both low-band and high-band,and has high application value in MBMA base station antenna design.