Asymmetrical Effects of Bi-Anisotropic Substrate-Superstrate Sandwich Structure on Patch Resonator

Abstract

Abstract-Few works on symmetric and asymmetric dielectrics have been published, specifically the case of chiral and bi-isotropic media. For this reason and taking into account the complexity of the studied environment, this paper treats the asymmetrical effects on the resonant frequency and the bandwidth of a rectangular microstrip patch antenna in a complex bi-anisotropic substrate-superstrate configuration. This structure is studied theoretically, and the obtained results are discussed and commented. The numerical analysis used in this paper is mainly employed in order to obtain original results. The originality of this work is presented by the bianisotropic chiral asymmetry and the combined effect of the substrate and the superstrate.

Gyro-chirality effect of bianisotropic substrate on the operational of rectangular microstrip patch antenna

“…As a definition the bianisotropic medium is a generalization of the anisotropic and chiral medium [15], where there are different types of anisotropic medium: uniaxial, biaxial, gyrotropic, etc. An important step in the distinction between anisotropic medium comes through splitting the constitutive parameter dyadic x (x=  ,  ,  and  ) into two parts, symmetric and antisymmetric [50] [54]:…”

“…The research work presented in [45] focused on chiral medium, for which those reciprocal bi-isotropic medium whose existence was out of controversy-nonreciprocal bi-isotropic medium that have neither been found nor manufactured; and the possibility of their existence is currently under discussion in the open literature [46], [47]; in addition to the nonreciprocal behavior of particular classes of such materials has also been studied in [48]- [50]. In this work, a gyrotropic bi-anisotropy of chirality for a rectangular patch antenna is detailed and discussed in terms of complex resonant frequency, half-power bandwidth and input impedance.…”

Effects of Superstrate Layer on the Resonant Characteristics of Superconducting Rectangular Microstrip Patch Antenna

“…Bandwidth of antenna can be increased by designing the antenna with dielectric cover [13], where structures with substrate-superstrate are generally employed to improve the characteristics of the resonator, especially those of the antenna [14]. Whether a superstrate over the patch is naturally formed or imposed by design may adversely affect the antenna's necessary performance characteristics such as resonant frequency, quality factor, bandwidth, radiation resistance, efficiency, and gain [15].…”

Spectral Domain Analysis of Gyrotropic Anisotropy Chiral Effect on the Input Impedance of a Printed Dipole Antenna

“…Therefore, only the Green's functionG xx , in Equation (11), is developed herein, and the other functions will not be presented in this work, since they are not involved in the calculations. Equation (12) gives the expression ofG xx at z = d, for the chiral medium.…”