Radiation from a dipole antenna on two-layer grounded Faraday chiral substrates

Abstract

The generalized spectral domain-exponential matrix technique (GSD-EMT) is used to investigate the radiation characteristics of a dipole antenna placed on various grounded Faraday chiral substrates, and such Faraday chiral materials include chiroferrite and semiconductor chiroplasma.Numerical results are presented to demonstrate the combined effects of gyrotropy and chirality on the pattern sharp as well as the main beam direction of dipole antenna, and the influences of different constitutive parameters are taken into consideration carefully. It is believed that the present study provide us much insight into the physical properties of Faraday chiral substrates.

The Combined Effects of Chiral Operation in Multilayered Bianisotropic Substrates

“…The material parameters used for calculations are related to parameters used in the literature, and the losses of the materials are neglected here so that the attenuation by the bianisotropic substrates can not mask effects produced by chiral operation. In addition, it should be emphasized that the developed computer codes have been checked at first and all figures in [28,44] have been reproduced under the corresponding conditions.…”

“…2, both co-and cross-polarized components of the far-field are symmetrical to the direction θ = θ m = 0 • . Here θ m is the main beam direction and its definition is the same as in [28,44] (i.e., the beam due to the co-polarized component of the electric field only, and for x -directed dipole in the ϕ = 90 • plane this implies E ϕ component). Since the axes of the four constitutive tensors c (i) (c = ε, µ, ξ, η) in case (a) are chosen to be in the same direction (…”

“…and following a similar procedure used in [28], the transverse field components in each layer of multilayered bianisotropic slabs can be expressed as: [28] have some printing errors, and their exact expressions are presented in APPENDIX 1 for the multilayered case. Furthermore, the general solution to the vector differential Eq.…”

“…Bianisotropic linear materials are characterized by four independent constitutive tensors, and till now significant theoretical research progress has been achieved concerning the electromagnetic characteristics and potential applications of some bianisotropic materials. For instance, the dyadic Green's function theory for source radiation and wave propagation in uniaxial and helicoidal bianisotropic media [2][3][4][5][6][7][8], wave reflection and transmission properties of multilayered bianisotropic slabs and their potential applications for making novel non-reflection coatings and filters [9][10][11][12][13][14][15], the guided hybrid mode features in some bianisotropic waveguides [16][17][18][19][20][21][22][23][24], the dispersion characteristics of bianisotropic microstrip transmission lines and the effects of bianisotropic substrate and su-perstrate on the radiation of sources [25][26][27][28], the scattering from some particular bianisotropic objects [29][30][31], the edge effect in bianisotropic region [32,33], and the macroscopic properties of bianisotropic mixtures as well as experimental investigations on the effective constitutive parameters of uniaxial bianisotropic composites [34][35][36][37][38][39], et al In these studies the authors usually pay attention to the diverse chiral effects in bianisotropic med...…”

“…To some degree speaking, such a technique is efficient and powerful to deal with most linear complex materials, and it has been employed in the author's previous study and improved more recently [14,28]. In this contribution, our attention is concentrated on the effects of chiral operation on the radiation characteristics of a dipole antenna placed on some grounded multilayered bianisotropic substrates, and this chiral operation is realized by stacking up a certain number of bianisotropic biaxial chiral plates in a way of the consecutive principal axes of four constitutive tensors c (i) (c = ε, µ, ξ e , ξ m ) describing either right-or left-handed spirality, or ranging the orientation of biasing magnetic field in the right-or left-handed spirality in Faraday chiral plates.…”