COMPUTER SIMULATION OF THE ELECTROMAGNETIC FIELD ON URBAN RADIO ROUTES WITH A MOBILE COMMUNICATION POINT

Приведены результаты выполненного с помощью программы FEKO [1-3] электродинамического расчета распределения поля в зоне городской застройки, представленной трехмерной компьютерной моделью. Проведена оценка интенсивности электромагнитного поля в радиоканале с подвижным пунктом связи на затененных и закрытых трассах. The results of the electrodynamic calculation of the field distribution in the urban area, represented by a threedimensional computer model, performed using the software FEKO, are presented. The intensity of the electromagnetic field in a radio channel with a mobile communication point on shaded and closed routes is estimated.

Integral representations in boundary-value problems on calculation of devices of microwave and EHF bands

In the electrodynamic calculation of microwave (EHF) devices using methods that lead to algorithms in an open form, strict integral relations (representations) are very useful: Lorentz lemma, reciprocity theorem, orthogonality condition for eigenwaves, etc. of the results obtained, their convergence improves, and in some cases the calculation of characteristics that cannot be calculated without the indicated representations. Integral representations are a record of the equations of electrodynamics (in any unified form) and their solutions in one or another generalized form, linking in general the electromagnetic fields in electrodynamic structures described by boundary value problems. Integral views are used to control the results obtained; insome cases, they allow obtaining analytical solutions; lead to self-consistent problems that take into account the reverse effect of the radiation field on the primary sources; allow obtaining a priori information about the spectrum of possible solutions; solve associated problems as specific problems of arousal. Consideration of the phenomenon of complex resonance in this work shows that integral representations make it possible to establish a connection between non-self-adjointness and self-consistency of boundary value problems.

Microwave technologies in medical and environmental practice.

This article discusses three current medical and environmental problems that use microwave technologies to solve. The first task was related to the influence of the magnetic field on the human body. At the same time, special attention was paid to its deficiency, which leads to undesirable consequences and the need for correction. The second task was related to the diagnosis and therapy of brain tumors. The results of studies of the possibility of virtual microwave diagnostics of cerebral edema using the CST MS 2013 software component on a computer phantom of the human head with physically accurate electrodynamic parameters of biological tissues are presented and its effectiveness is shown, including in the early stages of the disease. In addition, the possibility of local hyperthermia of neoplasms in the brain using a focused electromagnetic field is considered. The third task was related with assessment of the electromagnetic situation in the urban area in order to identify areas with field levels exceeding sanitary norms. Electrodynamic calculation of the field distribution in the urban development zone, represented by a three-dimensional computer model, was carried out on the base of the FEKO program.

VIBRATION PROTECTION OF POWERFUL INDUCTORS

Electrodynamic and vibroacoustic problems during induction heating of solids with variable curvature of surface - primarily heating of slabs for rolling - are viewed. It is recommended to perform electrodynamic calculation on numerical model developed through coupled circuits method and virtual displacement law. For numerical solution of vibration problem it is worth to use finite-element method. In the general case for calculating of distributed forces Biot-Savart-Laplaces law is used. This law permits to definite surface current density in a slab. Through inductor vibration model studies the form of inductor optimal shell is synthesized according to the criterion of minimal noise emissions.