The Software Designment for a Microwave Automatically Measuring System
Fen Xiao · Journal of Xiamen University · 2004
This paper presents the software and hardware system of a simple scalar network analyzer. The system is programmed by Visual C++, and its GUI is built in Windows operation system and convenient for operation. The microwave source is VCO, which is controlled by data collected card in PC, and microwave parameters such as standing wave radio, demodulation law of diode, permittivity of medium and transmission coefficient, etc., can be achieved automatically.The linearity or polynominal fitting models are implemented to achieve high precision in measuring the demodulation law of diode and the relationship between the output microwave signal frequency and the input direct voltage.Based on the assumption of weak coupling between the rectangle cavity with the outside source, the resonance curve of cavity can be viewed as Lorentz function and fitted by it to get low error.