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This article provides examples that illustrate the search for different two-layer metamaterials that provide rotation of the polarization plane (“optical activity”). Selected objects show a twenty-year history of the search for a new principle of creation of polarization rotators based on planar metamaterials that were implemented in the form of thin-layered periodic structures. The manifestation...
We have studied the possibility to design a compact polarization plane rotator of electromagnetic waves based on the structures with dihedral symmetry. Proposed structure allows rotation of polarization plane at arbitrary angles and has acceptable loss in given frequency band.
Recent advances in problem-oriented and general-purpose microwave-oriented software and applications developed in the department of computational electromagnetics are considered. Numerical-analytical automatic mode-matching based models are extended on the objects given in cylindrical coordinate system. The geometry has to be specified as the set of piece-wise coordinate fragments in Cartesian (MWD1...
We have studied the possibility of designing compact polarization plane rotator on the base of the structures with dihedral symmetry, and formed by 5-slotted irises. Proposed structure allows to rotate polarization plane by angles being different from 90° and have an acceptable loss in a given frequency band.
A possibility to design a compact polarization rotator based on the structures of dihedral symmetry is studied. Here, the diaphragms with several equal rectangular apertures are considered as dihedral symmetry structures. Ultimate performances of the rotators considered are obtained by using different optimization procedures. They demonstrate acceptable reflection in the predetermined frequency band...
A numerical algorithm for the analysis and optimization of broadband polarizers consisting of symmetrically placed rectangular ridges in a coaxial waveguide is developed. Because polarizer boundaries cannot be described in a single (cylindrical or Cartesian) coordinate system, the approach based on a stepped approximation of regular and ridged coaxial waveguides is proposed to apply. The factors influencing...
Small-sized waveguide bandpass filters based on modified split-ring resonators are considered. Extremely compact dimensions are their salient features distinguishing them from known designs. The filters demonstrate enhanced out-of-band suppression in a broad frequency range. We propose a way to reduce the longitudinal dimensions of the filter, consisting in rotation of the adjacent resonators. Arrangement...
The results of the design and testing of circular polarization splitters (polarizers) of the Ka-, X-, and S-bands, intended for operation as constituent parts of a three-band feed of a radio telescope reflector antenna, are presented. In addition, the results of developing a set of polarizers intended for connecting to waveguide outputs of band-measuring horn antennas are presented. These polarizers...
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