无反射滤波器的设计理论与实验研究

This project mainly focuses on the lumped and distributed reflectionless filters. Breakthrough the Morgan's reflectionless filter patent protection,  a new lumped reflectionless high/low–pass filter topology structure and a new distributed band–pass filter topology structure are proposed to solve the problem on reflectionless filter basic theory. Based on the IPD process, the design method of three–dimension reflectionless filters is studied to solve the problem of 3D layout and layout design method of the reflectionless filter in IPD process. With the method of cooperating with the active chips, the distributed filter is realised in microwave transceiver channel, and the improved data of signal-to-noise ratio (SNR) and the third order intercept point (IP3) can be obtained by the experiment. By lumped reflectionless filter processing and testing,  the influenced   reflectionless filter performance indexes caused by functional materials or processes are collected, such as temperature drift, power handling and some other electronic characteristics, providing the appropriate technology theoretical basis.

本项目主要研究集总式和分布式无反射滤波器。突破美国Morgan的无反射滤波器专利保护，新提出一种集总式无反射高/低通滤波器拓扑结构和一种分布式带通滤波器拓扑结构，解决无反射滤波器的基础理论。基于IPD工艺，研究三维无反射滤波器的设计方法，解决无反射滤波器在IPD工艺中的三维布局、布版图的设计规则问题。采用与有源芯片配合的方式，在微波收发通道中实现分布式滤波器，并通过实验得到无反射滤波器对信噪比（SNR）和三阶交调截取点（IP3）的改进数据。通过集总无反射滤波器的加工与测试，收集材料、工艺对无反射滤波器电性能指标、温漂、承受功率等特性的影响，提供合适的工艺理论基础。

提出了一种新的1阶无反射低通滤波器的电路结构，并根据IPD工艺进行了三维电磁场设计。在三维结构中，充分利用布局、耦合方式研究无反射低通滤波器的新型设计方法，实现了1阶无反射低通滤波器的设计，结果优于Morgan提出的单阶无反射低通电路拓扑结构。提出了增加无反射滤波器的阶数，提高集总式低通滤波器性能改进方法。对于无反射带通滤波器，虽然通过简单级联三阶无反射滤波器可以实现更好的滤波器特性，但带外抑制还是不能满足实际应用，提出了采用高低通组合和一体式带通滤波器拓扑结构。提出了通过借鉴传统滤波器带外零点的引入方式，给无反射滤波器也引入了传输零点。基于国内IPD工艺，完成了三维无反射滤波器的设计方法，解决了无反射滤波器在IPD工艺中的三维布局、布版图的设计规则问题，并对常用元器件进行了建模和实际加工测试验证，对后续开展自动化CAD设计，完成了相应的技术积累。