放大器型双极化有源微带天线阵的理论与实验

基于Green函数法推导出角馈双极化微带天线单元的输入阻抗和互阻抗的闭合表达式,并用腔模理论分析了其阵列的主极化和交叉极化方向图.设计了一副4×4元天线阵与低噪声放大器相接,将天线阵增益提高了12dB.有源器件对天线阵的方向留影响较小,方向图主瓣范围内交叉极化低于-36dB.有源天线阵的VSWR带宽和隔离度均大于无源天线阵.

Theory and Experiment of Corner Fed Dual-polarized Active Patch Antenna Array with Low-noise Amplifiers

New expressions for input and mutual impedance of corner-fed dual-polarized patch antenna double-and corner-fed by microstip line are derived on the basis of Green function method. Array patterns of the co-and cross-polarization are calculated by using the cavity theory. A 4×4 dual-polarized array integrated with low-noise amplifiers is designed and tested. An extra gain of 12dB comparable with the respective passive array is achieved at the central frequency. The radiation patterns have nearly no changes with the integrated amplifier, while the cross-polarization is lower than -36dB in the main lobe region. The bandwidth and isolation are largely increased when compared with those of the same array without the amplifiers.