K频段斐波那契网格稀疏阵列分析与设计

Analysis and Design of K Band Fibonacci Grid Sparse Array

针对低轨宽带卫星通信网、5G通信网应用中对K/Ka频段多波束有源相控阵天线的需求,对斐波那契网格阵列进行改进,提出一种大规模低旁瓣稀疏阵列的高效设计方法。首先从数学上对斐波那契网格阵列的栅瓣抑制特性进行解释,进而对阵列进行数值计算和全尺寸三维电磁仿真,最后结合实际工程应用给出一种K频段高密度集成有源相控阵多波束天线的阵面及射频芯片的布板方案。这种大间距阵列在大扫描角域和大带宽内具有低副瓣、无栅瓣、高增益等优良特性,非常适用于通信应用中的高密度集成有源相控阵天线。

For the demands of K/Ka band multibeam active phased array antenna in low Earth orbit(LEO)wideband satellite communication networks and 5G networks application,an efficient design method of large scale low side lobes sparse array based on Fibonacci grid is presented.The grating lobe suppression priority of Fibonacci grid is explained in mathematics,followed with numerical evaluation and full scale three dimensional electromagnetic simulation of several antenna arrays.A schematic layout of radiation elements and radio frequency integrated circuits(RFICs)of a super-integrated K band multibeam active phased array is demonstrated.Featured by low side lobes,non-grating lobes,high gain in wide scan angles and wide frequency band,this kind of large spacing array is adequate for the super-integrated phased array in communication.