一种星载Ka频段圆极化振子天线阵列设计

Design of a Spaceborne Ka Band Circularly Polarized Dipole Antenna Array

针对Ka频段卫星通信系统的需求,设计了一种应用于卫星通信的星载Ka频段圆极化振子天线阵列.天线单元采用非对称双臂振子单元形式,十字交叉振子采用自相移结构来实现圆极化.天线阵列采用三角形排布的方式,通过调整布阵时天线单元旋转相位,来实现阵列的右旋圆极化.仿真结果表明:天线阵列驻波比除阵面四周由于边缘效应引起的驻波比偏大外,其余都小于1.5;天线阵列的轴比小于2.3 dB;扫描60°时,天线增益下降小于5 dB,表明天线阵列具有较高辐射功率.该天线阵列可作为相控阵天线的馈源,在卫星通信系统具有良好的应用前景.

In order to meet the needs of Ka band satellite communication system,a Ka band circularly polarized dipole antenna array for satellite communication is designed.The antenna element is in the form of asymmetric double arm dipole element,and the cross oscillator uses a self-phase shift structure to achieve circular polarization.The right-hand circular polarization of the array is realized by adjusting the rotation phase of the antenna elements.The simulation results show that the VSWR of the array is less than 1.5 except for the larger VSWR caused by the edge effect around the array.The axial ratio of the antenna array is less than 2.3 dB.When scanning at 60°,the antenna gain decreases by less than 5 dB,indicating that the antenna array has a higher radiation power.As the feed source of the phased array antenna,the antenna array has a good application prospect in satellite communication systems.