RESEARCH AND MANUFACTURE OF A DIELECTRIC SUBSTRATE WITH THE INCLUSION OF A METAMATERIAL FOR PLANAR MODERATING SYSTEMS IN THE MILLIMETER RANGE

Abstract

The development and creation of miniature traveling wave tubes (TWT) is an urgent and promising task of modern microwave electronics. TWT has significant potential for high power and efficiency, wide bandwidth and high gain in the millimeter and terahertz ranges. One of the promising designs of deceleration systems that provide small dimensions and relatively low operating voltages TWT is a planar-type deceleration system on a dielectric substrate. Earlier, in a number of works, it was proposed to use metamaterials in the structure of the substrate in order to increase the efficiency of planar slow-wave systems, suppress parasitic oscillations, etc. The aim of this work is to study a promising design of a planar slow-wave system on a dielectric substrate, in the structure of which a metamaterial is embedded, for use in millimeter-wave TWTs. The paper presents the design results in the COMSOL Multiphysics environment of a meander-type planar slow-wave system. Substrate parameters: quartz material. In fig. 1 shows a dimensional diagram of the investigated decelerating system, the results of numerical simulation of electrodynamic characteristics, as well as the experimental implementation of a metamaterial using the method of laser ablation by nanosecond pulses. It was found that the inclusion of a metamaterial affects the dispersion characteristics of the slowing down system, leads to an increase in the coupling resistance due to the better concentration of the field at the surface of the slowing down system. In the course of the experimental implementation, the formation of the metamaterial was carried out with the following parameters of pulsed laser ablation: a pulse duration of 20 ns, a maximum pulse energy of 57 mJ, and a laser beam repetition rate of 100 mm / s. In Figures 1 (c, d) photographs of the metamaterial after processing, obtained using an optical microscope in transmitted light Olimpus. In the future, it is planned to study in detail the influence of the thickness and material of the substrate and the presence of a metamaterial on the electrodynamic characteristics of the slowing down system, as well as to optimize the experimental method for the implementation of the presented structure in the case of substrates made of different materials.

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Speaker

Ivan A. Chistyakov
Saratov State University, SC «RPE «Almaz»
Russia

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