On two-channels control systems described by equation with complex parameters

The paper includes the analysis of linear two-channels systems with asymmetric cross bonds. Classification of asymmetric bonds is presented and transfer functions with complex parameters are introduced.
The effect of different asymmetric bonds on increasing stability margin and critical gain of system is analyzed.
The author states that two-channels systems are more useful for synthesis of corrective devices than single-channel systems are.
Also the introduction of cross bonds is shown to provide considerable enlargement of stability field.