Hankel transform domain analysis of covered circular microstrip patch printed on an anisotropic dielectric layer

Abstract

In the present paper, a rigorous full-wave analysis for determining the resonant frequency and half-power bandwidth of covered circular microstrip patch antenna is presented. Green's functions of the structure are determined in Hankel transform domain. Galerkin's is used in the resolution of the electric field integral equation. The TM set modes issued from the cavity model theory are used to expand to unknown current on the patch. For an isotropic substrate, it is demonstrated that the bandwidth decreases with increasing ratio of superstrate-substrate thickness for high permittivity and low thickness of superstrate. Also, we show that the resonant frequency and bandwidth are highly dependent on the permittivity variations along the optical axis. The validity of the results is tested by comparing results with those published in the literature. Also, numerical results for the variation of the resonant frequency and half-power bandwidth of the substrate-superstrate configuration for high order modes, and for several values of substrates thickness are presented.

Efficient CAD Model to Analysis of High Tc Superconducting Circular Microstrip Antenna on Anisotropic Substrates

“…The antenna parameters for this study are h = 1.27 mm. The computed resonant frequency in Verma [14] for various anisotropic substrates is also shown to agree very well with the values computed using cavity model (6)(7)(8)(9). The results of this comparison indicate that the present model shows excellent agreements with those of Verma [14] for all values of patch radius.…”

“…In a previously presented study [6][7][8], we have shown that circular microstrip antenna with the properly selected uniaxial anisotropic substrate is more advantageous the isotropic one by exhibiting wider bandwidth characteristic with different resonant frequencies. Several computational methods have been carried for computing the resonant characteristics of superconducting circular microstrip patch antenna by using the spectral domain analysis and other fullwave analysis methods [6,9]. With the increasing complexity of geometry and material property, designing these antennas requires more and more dedicated and sophisticated computer-aided-design (CAD) tools to predict the characteristics.…”

“…In the design of microwave integrated circuit components and microstrip patch antennas, anisotropic substances have been increasingly popular. Especially the effects of uniaxial type anisotropy have also been considered in some of the later studies [5][6][7][8][9][10] due to the availability of this kind of substances such as Sapphire, Magnesium fluoride and Epsilam-10. Formulations of those studies are lengthy and complicated even in single substrate case.…”

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

“…When the thickness of the superconducting patch is less than three times of the zero-temperature penetration depth (λ 0 ), Z s can be expressed as follows [16][17][18][19]:…”

“…Several researchers have studied the effect of the air gap layer on the resonant frequency of highTc superconducting microstrip patch antenna [7,10,13,17]. To the best of our knowledge, neither any design guideline nor any experimental or theoretical results are available in the open literature to predict the characteristics of high-Tc superconducting rectangular microstrip patch with substrate-superstrate configuration.…”