Vovchuk D. Components of broadband communication means based on deterministic chaos and wire metastructures.

Ph.D. thesis addresses the important scientific problem of expending of functional abilities of communication system nodes using deterministic chaos signals and wire metastructures that allows improving the characteristics of noise immunity and information secrecy in the communication channel. Author has improved the chaotic masking scheme for hidden digital communication based on an analysis of advantageous and disadvantageous of existing schemes that operate on full synchronization phenomenon. The hiding information degree in the channel has been estimated. The thesis provides measures to increase the information rate by the spectrum spreading of Chua's scheme. To obtain of chaotic signals characterized by the similar statistical properties as noise ones the Colpitts oscillator was modified. The artificially constructed media that consists of the parallel wires to transfer broadband signals in the frequency range 0.9…12 GHz was proposed for the first time to ensure the quality connection between transmitter and receiver of hidden communication system based on deterministic chaos. The article is the first attempt to investigate the irregular wire structure for designing antennas that allows extending the frequency range of dipole antenna with arm length 12.5 mm from 2 to 5 GHz and the electromagnetic wave radiation in the wide frequency range 1.08 to 1.46 GHz was highlighted. It allows their implementation to broadband communication systems. The obtained results can be recommended to construct noise generators and to develop broadband communication systems that are characterized by high secrecy and noise protection degree in the channel as well as to design the multi-users network communications.