This paper proposes a signal feedback interference topology to control the characteristics of a coupled line bandpass filter. Control is carried out by varying the ratio of the transmission line parameters of the forward and the feedback couplers. The topology produces a compact filter that does not require a complicated design or fabrication. The results of the insertion and return losses show that the feedback‐controlled design has desirable features in terms of the design frequency, fractional bandwidth, stopband rejection level, roll‐off rate and insertion loss. The test results of the fabricated prototype achieved good agreement with the simulation results of the ideal transmission line design model. Several microwave, modern wireless and mobile/satellite communication systems may benefit from such a filter design due to its compactness and flexibility.

中文翻译：

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反馈干扰拓扑的微波带通滤波器

本文提出了一种信号反馈干扰拓扑，以控制耦合线带通滤波器的特性。通过改变前向和反馈耦合器的传输线参数的比率来执行控制。该拓扑结构产生了紧凑的滤波器，不需要复杂的设计或制造。插入损耗和回波损耗的结果表明，反馈控制设计在设计频率，分数带宽，阻带抑制水平，滚降速率和插入损耗方面具有理想的功能。所制作原型的测试结果与理想传输线设计模型的仿真结果吻合良好。几个微波炉