Research On 3mm Down-conversion Component

In millimeter-wave circuits and systems, the millimeter-wave receiving front-end plays a vital role on the performance of the system. In view of the increasing depth of millimeter wave technology used in modern military, communications and other fields, the study of millimeter wave technology becomes increasingly critical urgency. However, currently, there are few reports and studies about high-frequency circuits especially for 3mm band systems. The task of this subject is to research the theory and design method for 3mm receiving front-end system.In this article, the 3mm receiving front-end is designed for a radar receiver, which employs superheterodyne structure and hybrid integration technology with a fixed local oscillator frequency. The receiver front-end system includes two receiving branches, each branch is comprised of transitions, a low-noise amplifier, a mixer, filters and other components.Based on the requirements of project targets, the paper detailedly analyses overall design of 3mm receiving front-end, and refine, distribute, estimates related indicators for each sub-circuit. Especially focuses on the basic theory and design method for transition unit, filter circuit, low-noise amplifier and mixer. Firstly, we complete each component design and simulation, and some key ones which have greater impacts on the system performance are separately processed and tested. Then design overall circuit layout and cavity structure of the receiving front-end. It is indicated that the basic requirement of project target is achieved in final system performance estimation and test Finally, summarize the main contents of this paper and conclude the direction where the following work can be strengthened and improved.To a certain extent, the work carried out in this thesis may provide some relevant experience for future study of millimeter-wave receiving front-end technology.