Abstract
The split strip lines (SSL) with adjustable parameters and examples of devices based on them are examined. Changing the parameters of the split strip lines are carried out with the help of so-called controlling strips, coupled with parts of the split strip line and having a strong electromagnetic coupling with them. Between controlling strips and the screen the lumped regulating elements are included. In wide frequency range such strip structures can be considered as transmission lines with changeable characteristic impedance and changeable propagation coefficient. Frequency analysis of of scattering matrix S of controlled split strip lines with different circuits of strip inclusion is carried out. Examples of the use of split strip lines with adjustable parameters in the design of different devices were discussed.
Highlights
There are two main methods to change the parameters of striplines and coupled strip transmission lines
Expressions were obtained for calculation of frequency characteristics of the controlled sections at variation of impedance of the regulating elements
The section of coupled lines is considered as a strip line with a changeable characteristic impedance and a changeable propagation factor, if the dielectric filling of the structure is heterogeneous in the cross section
Summary
There are two main methods to change the parameters of striplines and coupled strip transmission lines. The second method is based on the introduction of lumped heterogeneities, creating the effect of changing parameters in a limited frequencies range, as this heterogeneity creates a frequency-selective circuit [6]. Transmission lines do not change their properties when the control elements are included in them, and the effect of changing the parameters of the system is observed due to interference of incident and reflected waves from inhomogeneities. The change of parameters in the controlled sections of the coupled strip lines was shown in the work [6]. The task was to study the frequency properties of SSL and the possibilities of adjusting their parameters by introducing an additional strip conductor and lumped elements
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