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• ELECTROMAGNETIC WAVES POLARIZATION TRANSFORMATION BY PRINTED GRATINGS AT MICROWAVES

  А. О. Kasyanov

  2022-01-31

  Abstract ▼

  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.

• PRINTED LATTICES APPLICATION TO ELECTROMAGNETIC WAVES POLARIZATION CONTROL AT MICROWAVES

  А.О. Kasyanov

  38-60

  2025-07-31

  Abstract ▼

  The paper is devoted to consideration of variants of solution to some problems of diffraction
  for printed arrays with anisotropic inhomogeneities. The rotation of the plane of polarization is
  realized by means of a twist-reflector. On the basis of computational and full-scale experiments it
  was shown that twist reflectors based on microstrip reflective type antenna arrays (RAA) can be
  quite broadband. The obvious advantage of such twist-reflectors is simplicity of the technology of
  their manufacture, small thickness and weight. In addition, in twist-reflectors based on printed
  RAA, 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 twistreflectors.
  It is shown that introduction of impedance loads in the construction of the re-radiating
  elements of the printed RAA 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
  RAA. The results of numerical studies based on the author algorithms and computational programs
  are presented. Besides, spatial polarizing filters and a controllable twist-reflectors based
  on microstrip RAA are considered. If microstrip elements of a twist-reflector contain controllable
  loads, then qualitatively new type of the microwave device is formed. This device enables to control
  polarization of the scattered field. Such devices can be named by polarizing modulators or
  manipulators. By means of printed RAA with elements of complex topology the spatial polarizers,
  which can transform electromagnetic waves with linear polarization in waves with rotating polarization
  and, in particular, in waves with circular polarization, are realized