This paper presents a methodology of designing an amplifier integrated with a microstrip filter using an active coupling matrix. The microstrip filter is directly coupled to the active device, and the integrated filter amplifier can achieve filtering as well as matching functionalities, simultaneously, eliminating the need for separate matching networks. The filter amplifier is represented by an active coupling matrix, with additional columns and rows in the matrix corresponding to the active transistor. The matrix can be used to calculate the S-parameter responses (i.e., the return loss and the gain) and the initial dimensions of the integrated device. Moreover, the integration of a filter and an amplifier leads to a reduced loss and a more compact architecture of the devices. An X-band microstrip filter amplifier has been designed and demonstrated as an example. Microstrip technology has been chosen because of its appealing advantages of easy fabrication, low cost, and most importantly, easy integration with active devices.

本文介绍了一种使用有源耦合矩阵设计集成微带滤波器的放大器的方法。微带滤波器直接耦合到有源器件，集成滤波器放大器可以同时实现滤波和匹配功能，无需单独的匹配网络。滤波器放大器由有源耦合矩阵表示，矩阵中的附加列和行对应于有源晶体管。该矩阵可用于计算 S 参数响应（即回波损耗和增益）和集成器件的初始尺寸。此外，滤波器和放大器的集成导致损耗降低和器件结构更紧凑。作为示例，我们设计并演示了一个 X 波段微带滤波器放大器。之所以选择微带线技术，是因为它具有易于制造、成本低以及最重要的是易于与有源器件集成的吸引人的优势。