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为了在毫米波波段准确测量波导器件的反射系数,提出了一种应用在反射系数测试前端(反射计)中的校准方法.该校准方法采用基于多项式的误差模型,使得每一个误差项的求解都转化成一个求解轨迹圆圆心的问题,同时不影响求解精度.采用一个滑动负载、一个滑动短路和一个短路器,在毫米波波段降低了对标准件理想程度的要求.实验中搭建了一个Ka波段的反射计,图解误差项的求解过程,分析了误差项的物理意义.把校准后的测量结果与商用矢量网络分析仪(VNA,Vector Network Analyzer)进行比较,吻合较好.同样比较了一组W波段反射计对波纹喇叭的测量结果,进一步验证了方法的合理性.
In order to accurately measure the reflection coefficient of the waveguide device in the millimeter wave band, a calibration method used in the front end of the reflection coefficient test (reflectometer) is proposed. The calibration method uses a polynomial-based error model so that the solution of each error term Which is transformed into a solution of the problem of the circle center of the trajectory without affecting the accuracy of the solution.Using a sliding load, a sliding short circuit and a short-circuit device, in the millimeter wave band reduced the ideal degree of standard parts.A experiment set up a Ka band , And the physical meaning of the error term is analyzed.The comparison between the calibrated measurement results and the Vector Network Analyzer (VNA) is in good agreement with that of a set of W-band reflectometer of the corrugated horn measurements, and further verify the rationality of the method.