Publication de 12 numéros par an
ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009
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Using Polarization Effects to Improve the Electromagnetic Compatibility of Radio Electronic Equipment
RÉSUMÉ
The Electromagnetic Compatibility (EMC) of Radio Electronic Equipment (REE) of different functional destinations and operation wave bands is provided in antenna engineering by means of synthesizing of antennas with improved electromagnetic performance, for example by minimizing the level of side and rear radiation, either in the whole space or in a certain angular sector [1]. However, this approach may face difficulties in the case when the transceive antennas are placed in the near-field (Fresnel) zone of each other. This can happen, for example, when trying to provide the in-object intersystem EMC of on-board REE in aircraft or other mobile vehicles. Actually, it is well known that the nulls of the radiation pattern become blurred in the antenna near-field zone. This means that the field level in the corresponding directions (where the far field pattern has its zero values) is comparable with the field level in any other direction, including that of the principal maximum. In a near vicinity of an antenna its spatial field distribution is close to the amplitude distribution of the sources of this antenna or of that in the radiating aperture. Moreover, even if the distance between the antennas is sufficient for forming deep pattern nulls, it is usually necessary to create rather complex amplitude and phase distributions of the field sources on the synthesized antenna. Maintaining these distributions with a high accuracy through the operating range may also present difficulties.
The purpose of this paper is to analyze the possibilities of solving the problems of the intersystem EMC by using the polarization effects of electromagnetic field.