Microwave Automatic Measurement System

In this article we introduce the theory of microwave automeasure system and the construction,design and test of ASNA2001 scalar network analyzer. It applies to all kinds of soild microwave sources and supports manual and automatic measurement . With it,one port reflection coefficient,SWR and two ports S matrix can be got at fixed-frequency. One port reflection parameters,two ports transmission parameters and Q value of microwave resonator can be measured over wide frequency . Applying software is developed for windows98 using VC++6.0 with good user interface realized,real time display and printing of measure result enabled. Comparing to those doing the same research,our system is outstanding both in hardware and in software. This system is keeping ahead in our country.Now those world-class microwave network analyzers in circulation are too expensive for general use . In view of this condition,we made the research and development of ASNA2001. Our product can be used in research institutions,colleges and factory labs. This article is organized like below:In chapter one we introduce microwave automeasurement technics(MAMT) and theories needed in microwave measurement . First introduces briefly the characteristic of microwave,the history of MAMT,its characteristic and trends. Then explains the contents of one port reflection parameters,the way to measure them and something to pay attention to . At the end we illustrates how to get the reversible two ports S matrix using eight-point method.Chapter two focuses on the architecture and circuit design of ASNA2001. Three parts are included:power supplier,AD dc amplifier and stepping-motor driver. Circuit diagrams,design thoughtway and some calculation are provided .Software design is explained in chapter three. We try to make clear how to choose operating system,developing tool and programming idea. Flow charts are provided. Using object oriented programming(OOP) method,we designed some classes . They are also introduced.In chapter four we test our system in experiments. Results are given and analysed.A sum-up is made in chapter five.