摘要
介绍了一种交叉耦合微波滤波器的自适应预失真理论。该理论在传统预失真理论的基础上,实现了传输极点向jω轴的异步移动。每一个极点移动的距离,可以通过最小二乘法优化得到,避免了传统预失真中极点同步移动的盲目性。虽然传统预失真技术可以使滤波器通带内损耗变化及群时延变得较为平坦,但这是以增大插入损耗、回波损耗为代价的。采用自适应预失真技术,滤波器的电参数将得到较好的折衷。同时,通过选择合适的反射零点,可以综合出物理结构对称或者同步调谐滤波器对应的耦合矩阵。
This paper presents an adaptive predistortion theory for cross-coupled microwave filters. On the basis of traditional method, the transmission poles are moved to the axis at a difference pace, which can be determined by an effective optimization method, namely, the Least Square method. Although the traditional method could flat the loss variation and group delay in the passband, it is at the severe expense of the insertion loss and return loss. With the adaptive predistortion technique, the electrical parameters for a filter can be well traded off. Meanwhile, the coupling matrix of the physical symmetric or synchronously tuned filters can be synthesized by choosing the appropriate reflection zeros.
出处
《电子科技》
2010年第2期49-51,共3页
Electronic Science and Technology
基金
国家自然科学基金资助项目(60571059)
关键词
微波滤波器
自适应预失真技术
传输极点
耦合矩阵
microwave filters
adaptively predistortion technique
transmission poles
coupling matrix
