Analysis of the upper band load matching of class I (Darlington type) due to the choice of the approximating function of the synthesized matching circuits
In the introduction it is shown the relevance of broadband reconciliation tasks, which are of great practical value, since at the design stage they determine the characteristics of the radio engineering system. The aim of this work is to assess the upper band load matching of class I (Darlington type) due to the choice of the second-order approximating function of the synthesized matching network for a given load. In the main part it is presented the general positions of broadband matching theory, and the analysis of the alignment setting of the load of class I (Darlington type) is carried out. This parameter allows to obtain limiting values of load parameters for a given power transfer function of the matching circuit. As initial data for the solution of the problem the load of class I (Darlington type), as well as the reflection coefficient function obtained from the various approximating second-order functions are chosen. Based on the analysis of the matching parameter, the minimum values of the load parameters are obtained. To determine the gain in the matching band, a fundamental restriction on the Bode matching limits is used. The obtained numerical values of the limiting level of matching allow to judge the change in the load matching band depending on the choice of the approximating power transfer function of the matching circuit. The analysis of the estimation of the matching band with respect to the initially chosen values of the load ratings is made. Due to the lack of currently available literature with a systematic analysis of the approximating functions used in the reconciliation tasks, the obtained results can be used as recommendations for the design of broadband matching circuits adapted for the load of class I (Darlington type).