Dual-Frequency Behavior of Stacked High T c Superconducting Microstrip Patches

Abstract

The dual-frequency behavior of stacked high T c superconducting rectangular microstrip patches fabricated on a two-layered substrate is investigated using a full-wave spectral analysis in conjunction with the complex resistive boundary condition. Using a matrix representation of each layer, the dyadic Green's functions of the problem are efficiently determined in the vector Fourier transform domain. The stationary phase method is used for computing the radiation electric field of the antenna. The proposed approach is validated by comparison of the computed results with previously published data. Variations of the lower and upper resonant frequencies, bandwidth and quality factor with the operating temperature are given. Results showing the effects of the bottom patch thickness as well as the top patch thickness on the dual-frequency behavior of the stacked configuration are also presented and discussed. Finally, for a better comprehension of the dual-frequency operation, a comparison between the characteristics of the lower and upper resonances is given.

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

“…High Tc superconducting microstrip patch antennas have higher gain than their normal counterparts [7], due to the advantages of superconductors [8,9]. Benefits of using high Tc superconducting materials at high frequencies include [8]: 1) very small losses, which means low attenuation and low noise level; 2) very low dispersion up to frequencies of several tens of GHz; 3) smaller devices due to minor losses, which leads to greater combination density; and 4) the transmission phase can be significantly reduced because of the smaller size and shorter interconnects [9], but they suffer from extremely narrow bandwidth, which severely limits their application [7].…”

“…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.…”

“…In [7], we studied the resonant characteristics behavior of covered high superconducting microstrip patch antennas using a full-wave spectral domain technique in conjunction with the compound resistive boundary condition. The effects of certain important parameters such as thickness and permittivity values of the superstrate and dielectric substrate, the dimensions and thickness of superconducting patch on the resonant frequencies are presented.…”

A Review: Circuit Theory of Microstrip Antennas for Dual-, Multi-, and Ultra-Widebands

“…Ma and Row [40] proposed a design of single-fed antenna structure composed of two stacked patches with different polarizations and radiation patterns. Benkouda et al [41] investigated stacked high T c superconducting rectangular patches fabricated on a two-layered substrate using a full-wave spectral analysis. Batgerel and Eom [42] presented a stacked microstrip patch antenna structure combined with high-gain dielectric rod and a sleeve-dipole element.…”

Design and Analysis of a Microstrip Antenna Based on Superconducting Material for Millimeter Wave Applications

“…High T c (HT c ) superconducting microstrip patch antennas have higher gain than their normal counterparts, but they suffer from the extremely narrow bandwidth, which severely limits their application [7].…”