ELECTROMAGNETIC WAVES POLARIZATION TRANSFORMATION BY PRINTED GRATINGS AT MICROWAVES
Keywords:
Polarization transformation, polarizer, electromagnetic activity, grating, printed array, diffraction grating, mathematical simulation, re-radiator, scattering matrix, twist-reflectorAbstract
The problem of printed gratings application is considered as converters of electromagnetic
waves polarization and polarizing modulators. Two directions in development of antenna engineering
are considered in this paper. In each of them the scattering fields control of an antenna
arrays allows essentially to expand functionalities of radio engineering sets. The first direction is
the creation of auxiliary depolarizing reflectors for two-mirror reflector antennas and folded
lenses. In addition, in twist-reflectors based on printed gratings, it is possible to constructively
realize the necessary phase distributions of the field on their surfaces. Thus, it becomes possible to
use such twist-reflectors to create phase-correcting twist-reflectors. The second direction is connected
to application of antenna arrays for a reduction of a radar cross section of the radartracking
targets. Transformation of a field polarization by an antenna array allows to achieve both
these purposes. In an aspect of high cost and complexity of arrays experimental researches as a method of the analysis the mathematical simulation is selected. Besides, it is shown that introduction
of impedance loads in the construction of the re-radiating elements of the printed grating
opens additional possibilities for controlling the field scattered by it. Thus, twist reflectors with
improved characteristics can be realized on the basis of microstrip-pin gratings. The given results
can be used for choosing the most of rational electrodynamic structure geometry variant at decision
of particular problems by antennas engineering. The possible flat arrays based on printed
complicated shape elements application area is also discussed and it's shown these arrays are the
very attractive type for controllable radioelectronic covers designing at microwaves. Some numerical
results presented prove the possibility of a printed reflectarrays application as smart covers
microwave modules.
