中文摘要：

为了解决耦合线滤波器谐波抑制问题,提出了一种新的结构简单的平行耦合线带通滤波器.该滤波器由平行耦合线和开路枝节组成.首先基于耦合线带通滤波器的等效电路图,通过奇偶模理论得到设计方程,并设计了带通滤波器;分析了滤波器特性与电参数之间的关系;通过仿真优化得到了滤波器的物理尺寸;制备并测试了滤波器的S参数,仿真结果和测试结果基本一致.该滤波器具有结构简单、面积小等优点,并通过引入传输零点实现了较宽的阻带抑制和较好的选择性.

英文摘要：

In order to solve harmonic suppression, a parallel coupled line band-pass filter with simple structure was proposed.The filter consists of parallel coupled lines and open stubs.Filters equation was firstly obtained via odd-even mode analytical method, which is based on the equivalent circuit of the proposed coupled line band-pass filter, and a compact band-pass filter was designed.Secondly, the relationship between filters resonant characteristics and its electrical parameters was analyzed.And then, the geometric parameters of the proposed band-pass filter was obtained and optimized.Finally, the proposed band-pass filter and measured its S parameters was fabricated, which were basically consistent with simulation.It is founded that the filter designed has the advantages of simple structure, small size, etc.The proposed band-pass filter also has a wide stop band rejection and better selectivity through the introduction of transmission zeros.