Methods for increasing the efficiency of shapers powerful microwave radiation in the task of electromagnetic destruction of a group of radio-electronic means.

Methods for increasing the efficiency of electromagnetic field shapers based on powerful microwave generators in case of electromagnetic defeat to a group of radio-electronic means distributed on the earth is surface have been determined. As an indicator of efficiency the radius of the zone of electromagnetic defeat of the most resistant radio-electronic mean was chosen. The limitations of the maximum power of the generator due to the finite energy of the power supply and (or) the electrical strength of the air in the radiating antenna are taken into account. It was found that the main methods to improve the efficiency of the electromagnetic field formers are the choice of the radiation parameters of the generator and the directivity characteristics of the radiating antenna. The optimal modes of operation of a microwave generator with a limited energy the power source have been determined. A comparison is made of the efficiency of shapers with different types of radiating antennas. It is shown that antennas with narrow toroidal radiation patterns are the most preferable for solving the problem under consideration.

LIBRARY OF MATHEMATICAL MODELS OF MICROWAVE AMPLIFIERS AND MICROWAVE GENERATORS

The paper considers mathematical models of an amplifier, an unstabilized generator, and an autogenerator which take into account the stability parameters of the active component. The developed library of mathematical models provides automation of simulation modeling of amplifiers and autogenerators by means of a simulator-analyzer in the CAD system.

Parameters of the electric strength of air in a surface antenna during the emission of an ultrahigh-frequency pulse with a trapezoidal envelope

On the basis of the breakdown criterion and the equation of continuity of electrons in air, the amplitude and energy parameters of the electric strength of air in the surface antenna of a powerful microwave relativistic generator are determined when pulses are emitted with a trapezoidal envelope. Triangular and rectangular envelopes were considered as boundary cases of a trapezoidal envelope. The dependence of the parameters of electric strength on the shape of the envelope has been established. The calculation of the dependences of the breakdown field and the maximum permissible energy in a flat aperture on the pulse duration in the range of realizable durations of powerful relativistic microwave generators is carried out. For the same duration, the largest breakdown field has a pulse with a triangular envelope, and the smallest a pulse with a rectangular envelope. Wherein a pulse with a triangular envelope has the lowest maximum permissible energy, and a rectangular one has the highest. The relationships between the maximum permissible energy and the breakdown field for the pulses under consideration are determined. With the same maximum permissible peak amplitude, the highest energy has a pulse with a triangular envelope, and the smallest a pulse with a rectangular envelope.

A Novel Microwave and Induction Heating Applicator for Metal Making: Design and Testing

The use of microwave heating in primary metallurgy is gaining an increasing interest due to the possibility to selectively process ores and to volumetrically heat large amounts of low-thermal conductivity minerals. In this paper the study, development and testing of a new applicator combining the use of microwave and induction heating for rapid reduction of metal containing oxides is described. Numerical simulation was used in order to achieve the proper control over heat generation, considering the use of microwave solid state generators. A prototype, with a capacity up to 5 liters of standard input feed but with the predisposition for continuous processing has been designed, built and tested on reference loads like iron oxide powders and pellets. Results on the microwave heating part of the applicator indicate that it allows to efficiently and rapidly process these kinds of loads, which change from dielectric to conductors as reduction proceeds. The use of variable frequency solid state microwave generators allows to maximize energy efficiency and to controllably change the heating pattern inside the load.

Modeling of three-limb three-phase transformer relates to shunt core using in industrial microwave generators with n=2 magnetron per phase

<p>This paper describes the development and implementation of a digital simulation model of a three-phase transformer relates to shunt core transformer, which used to drive magnetron tubes in the microwave. The focus of this study is based on modeling of a new shell-type of three limbs three-phase transformer. The model uses to feed two magnetrons instead of one magnetron per phase. The proposed model is established on the simultaneous analysis of a duo electromagnetic lumped component equivalent circuit. This latter was implemented in a MATLAB environment under rated conditions. The results obtained from the application of the analytical method are provided results in conformity to the experimental tests in the case of single phase high voltage power supply for one magnetron.</p>