Properties of Helical Structures Containing Periodical Inhomogeneities

Abstract

Rejecting properties of inhomogeneous helical systems are considered. The model of the systems based on the multi-conductor line method is used. Examples of calculated characteristics are presented, and properties of the non-homogeneous helical systems are revealed. In the system containing two homogeneous sections along the helix turn, the stop-band appears when the phase angle between the voltages on the neighbor conductors of the helix approach π. Dispersion properties of the helical system containing periodical inhomogeneities can be improved reducing variation of characteristic impedance along the helix turn at θ = π and reducing the length of the inhomogeneous section of the helix turn. Besides that we can increase the width of the pass-band of the helical system containing periodical inhomogeneities decreasing the period of inhomogeneities (increasing the number of the periods of inhomogeneities along the helix turn). Ill. 5, bibl. 14 (in English, summaries in English, Russian and Lithuanian).