Diffraction of electromegnetic waves by electrically controlled FDF-structures

Abstract

Novel electrodynamic FDF-structures are of special interest since it is a key unit for new class of mm-wave integrated phased array antennas [1,2], FDF-structure is planar, multilayer and anisotropic, it is consisted of two thin ferrite substrates with dielectric layer having high dielectric constant displaced between ferrite layers. The magnetization of ferrite elements leads to variation of propagation constant, electromagnetic field configuration and mode transformation of propagating electromagnetic waves [2] as well as to the changes of scattering parameters to be found. Scattering of two models of FDF-structures has been analyzed: multilayer anisotropic structure with arbitrary number of infinite layers (infinite model) and the model consisted of the set of three-layer FDF-waveguides (discrete model). The case with patch dipoles placed on one ferrite substrate and witwwithout metal screen on another ferrite substrate were considered The analysis has been carried out with the help of generalized reciprocity principle and surface impedance matrix method for infinite model or by space harmonic decomposition method for discrete model. Diffraction analysis resulted in reflection coefficient, dipole pattern diagram and radiation impedance calculations. The results are evidently very helpful for optimization of mm-wave integrated phased array parameters which promise wide civil application in mobile communication and autonomous cruise control radar systems. References: 1. Ernst F. Zaitsev et al. MM-wave Integrated Phased Arrays with Ferrite Control.