METHOD FOR MEASURING PARAMETERS OF A QUADRIPOLE USING THE WALPERT-SMITH DIAGRAM

摘要

The proposed method for measuring parameters of a quadripole using the Walpert-Smith diagram implies measuring the input and the output immitances of the quadripole at the different specified immitances of the load and signal source, with the following calculation of immittance parameters W11, W22. The method is distinctive by measuring only two values of the input immitance and one value of the output immitance at two corresponding arbitrary specified values of the load immitance and an arbitrary specified value of the signal source immitance, calculating immitance parameters W11, W22, and W12W21, the angle (?) of the slope of the diagram to the real axis in the complex plane and the radiuses (?) of the diagrams in the complex planes of the input and output immitances, determining the point of origin for the diagram in the complex plane of the input immitances, drawing a straight line through the said point at the angle of ? to the real axis, plotting a section that is equal to the double radius (?) of the diagram in the complex plane of the input immitances, and aligning the said section with the central axis of the diagram for representing the Walpert-Smith diagram in the complex plane of the input immitances. The similar procedure is used for representing the Walpert-Smith diagram in the complex plane of the output immitances. The diagram representations so obtained are normalized for a possibility to use the standard Walpert-Smith diagrams at the subsequent calculations. The input and output immitances are determined by the standard diagrams at the specified parameters of the quadripole load.