Frequency-invariant pattern synthesis of conformal array antenna with low cross-polarisation
Frequency-invariant pattern synthesis of conformal array antenna with low cross-polarisation
复制标题
低交叉极化共形阵列天线的频率不变方向图合成
DOI：
10.1049/iet-map:20070258
复制
发表时间：
2008-08-01
影响因子：
1.7
通讯作者：
Lin, Y. -Z
中科院分区：
文献类型：
--
作者：
Wang, B. -H.;Guo, Y.;Lin, Y. -Z
尽管共形阵具有传统平面阵无法比拟的优点，但它也给天线设计带来了许多挑战，包括阵元法向因曲率变化、严重的交叉极化效应、有限的工作带宽等。提出了一种适用于共形阵方向图综合的空时极化滤波器结构，该滤波器通过对每个阵元分配有限冲激响应（FIR）滤波器来获得频率不变的阵列方向图，并利用阵元极化分集来抑制交叉极化。利用交替投影法得到最优权向量。交替投影法是一种功能强大且有吸引力的方向图综合方法，因为它需要相对较小的计算负担，并且可以以可见的方式自由地实现各种各样的期望约束，这通常是其他优化方法不可能实现的。本文提出的方向图综合方法为频率不变、低交叉极化的共形阵方向图综合建立了统一的框架。仿真结果证明了所提出的方法的有效性和行为。
Despite their potential and promising advantages over classical planar arrays, conformal arrays also present many challenges to the antenna designer, including varying element normal due to curvature, serious cross-polarisation effect, limited operational bandwidth and so on. A uniform method for the element polarised pattern transformation of arbitrary 3D conformal arrays is presented based on Euler rotation. A space-time-polarisation filter structure is proposed for the pattern synthesis of conformal array, in which the finite impulse response (FIR) filters assigned to every element are used to acquire the frequency-invariant array pattern and the element polarisation diversity in array global coordinates is used to depress the cross-polarisation level. The optimal weight vector is obtained by alternating projection method. The alternating projection method is a powerful and attractive method for the pattern synthesis in that it requires relatively smaller amount of computation burden and a wide variety of desirable constraints can be freely implemented in a -visible- way, which is usually impossible for other optimisation method. The pattern synthesis method proposed has established a unified frame for the frequency-invariant and low cross-polarisation pattern synthesis of conformal array. Simulation results are provided to demonstrate the effectiveness and behaviour of the proposed method.