The types of interconnection of two-port networks are: series,parallel,series-parallel,parallel-series and cascade connection.

Considering the changes of a power system in topology and on the basis of the two-port network theory, a fast method to calculate the open-port voltage of positive sequence network during a large-scale power system oscillation, which is caused by asymmetrical open-conductor faults, is presented.

tuner or the televisor in VHF band by the theory of Two-port network and filter.

In this paper, the g-parameters of double-port networks in series-parallel connection are deduced, and its application in circuit analysis is introduced.

This paper adopts the theory of two port networks to simplify the sinusoidal oscillating circuit into no power two port networks and describes it with parameter of two port networks.

Y shape microwave network and its application to radar system;

Based on the technological analysis of microwave network devices,the technological process and parameters for turning this kind of parts are determined on the premise of meeting the performance requirements,thus,a practical technological process is established for machining and manufacturing this kind of parts.

The paper briefly introduces the principle of enhanced electronic calibration, the concept and application of mixed mode S parameters in modern microwave network analysis, and the method of accurate high power measurements by vector network analyzers.

Aiming at the improvement of typical equivalent-circuit model s performance on precision, service band and compatibility with network analysis method, from ac I-V equations, this paper calculated SiGe HBTs two port network parameter model described by scattering parameters.