Investigation of delay system properties by software package “MicroWave Studio”
Possibilities of the MicroWave Studio (MWS) package application to the investigation of properties of helical delay systems are analyzed. MWS is a modern system of three-dimensional electromagnetic modeling. The program uses the finite integral technique (FIT), which, evaluating the energy conservation law, at first describes the Maxwell equations on a spatial grid and then forms specific differential equations (wave and Poisson equations). The method can be realized in the frequency and time ranges. Flat helical systems with different type internal shields: thin and thick continuous, anisotropic with longitudinal slots and formed of two parallel wafers, symmetrically and asymmetrically placed inside the helix − were analyzed using this program The obtained results confirmed the theoretical and experimental investigation results of authors of this work and other earlier published works. It should be noted that the package enables determination of physical processes occurring in the system. Alongside with main characteristics of the system, it is possible to obtain the distribution of electric and magnetic fields and surface currents in the system electrodes. The MWS application made it possible to reveal the investigated system properties earlier not detected by theoretical research. The introduction of longitudinal slots into the thin internal helix shield (the thickness of which is five and more times less than the width) does not change the system characteristics because the anisotropic properties of such a shield are very slightly expressed. The investigations confirmed that the cause of resonances in the helical system with the internal and external shield was the coaxial line segment, which is formed of shortconnected internal and external shields at the systems ends. Additional resonances in the system due to slots on the internal shield were not detected. The system with dielectric holders was investigated, and it was determined that such a system is distinguished by the rejection filter properties. It has been shown that it is possible to extend the frequency pass-band of such a system almost two times by placing the internal and external shields asymmetrical about the helix. It is possible to considerably reduce the influence of holders (to narrow down the rejection band and to shift it to the higher frequency range) by using the two-row dielectric holder. Ill. 11, bibl. 7 (in Lithuanian; summary in Lithuanian, English and Russian).
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