摘要
本文重点研究了一种赋形波束功率方向图的综合算法，并以赋球波束为例分别讨论了等间距线阵和方阵的综合过程。
传统的赋形波束综合算法没有对电流幅度加以有效的控制，综合得到的电流幅度变化较大，给馈电网络的设计和实现造成很大困难。这里把线阵综合问题转化为优化问题来解决，即要求在足够多的采样点处，综合得到的方向图与目标方向图之间的误差达到最小。并在综合的过程中引入了隐含的电流幅度约束条件，大大降低了电流幅度的变化，保证了工程上的可实现性。
本文正是采用此方法首先得到了线阵综合的结果，并将它推广运用到面阵综合的情形。为了使问题简化，在综合过程中假设阵元都是全向性的，最后再选择一定数量的圆锥喇叭作为阵元对方向图进行了数值模拟和仿真。两种情形都充分表明这种综合方法简单有效。
In this paper, a synthesis method is studied to produce the shaped beam patterns. This method is based on the fact that synthesis of antenna patterns is equivalent to minimizing a certain function.
Shaped pattern synthesis originated with Schelkunoff in 1943. However, the current magnitude variations could not be effectively controlled by most conventional approaches until Michael. J. Buckley in 1993 employed the implicitly constrained current elements in the optimization process. In his pioneering work, pattern synthesis is viewed as the minimization of an objective function and only that portion of the solution space which yields physically realizable solutions is searched.
This paper has successfully adopted the above method to synthesize an equally-spaced linear array, and then has extended its application into the synthesis of shaped beam patterns from planar arrays. To simplify the question, each element can be viewed as omnidirectional during the synthesis. Finally the horn is chosen as the array element to revise that synthesis result. The simulation results both from the equally-spaced linear array and from the square array prove that the above method is flexible and effective.
引文
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