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长期以来,在微波测量领域内,同轴测量线的精度低于波导测量线的测量精度,而同轴定向耦合器的精度则更差。为了提高驻波测量的精度,人们一方面在制造工艺上改善测量线及定向耦合器等,另一方面,寻求新的测量方法。近年来出现的驻波比电桥是利用新的测量原理实现驻波比(或反射系数、回波损耗)精密测量的一种仪器。它具有精度高、分辨度高、宜于测量小反射、制造简单和成本低廉的优点。本文将介绍这一技术的原理、测量方法和测量精度等。
For a long time, in the field of microwave measurement, the accuracy of coaxial measurement line is lower than the measurement accuracy of waveguide measurement line, while the accuracy of coaxial directional coupler is even worse. In order to improve the accuracy of standing wave measurement, one on the manufacturing process to improve the measurement line and directional coupler, on the other hand, to find new measurement methods. The VSWR bridge appeared in recent years is an instrument that uses the new measurement principle to achieve the precision measurement of VSWR (or reflection coefficient, return loss). It has the advantages of high precision, high resolution, suitable for measuring small reflections, simple manufacture and low cost. This article will introduce the principle of this technology, measurement methods and measurement accuracy.