Two models of the reflection coefficient modulus meter in a wide frequency band using microwave radiometry

Abstract: Two models of a broadband meter of the integral value of the reflection coefficient modulus using low-intensity noise signals are considered, which operation principle is based on one of the modifications of the zero measurement method. As a result of the simulation, the effect on the accuracy of measurements of the non-ideality of nodes in the input path is determined and expressions are obtained for selecting the parameters of the nodes with allowance for a given measurement error. It is shown that the main error occurs at the edges of the measuring range and has different signs for the minimum and maximum values. A second model of a meter with a calibration at one point is proposed. Then, the error at the end of the measuring scale assumes a zero value, and at the beginning it is related to the degree of isolation of the directional coupler.

Keywords: microwave radiometry, reflection coefficient