Fourier Transform Domain Analysis of High T c Superconducting Rectangular Microstrip Patch over Ground Plane with Rectangular Aperture

Abstract

A rigorous full-wave analysis in the Fourier transform domain is carried out in order to obtain the resonant frequencies and half-power bandwidths of the high T c superconducting rectangular microstrip patches over ground planes with rectangular apertures. To include the effect of the superconductivity of the microstrip patch in the full-wave analysis, a complex surface impedance is considered. This impedance is determined by using London's equation and the two-fluid model of Gorter and Casimir. The validity of the solution is tested by comparison of the computed results with previously published data. Variations of the resonant frequency with the high T c superconducting film thickness are presented. Results showing the effect of the temperature on the resonant frequency and half-power bandwidth of the superconducting microstrip antenna with a rectangular aperture in the ground plane are also given. Finally, a comparison between the efficiency of two antennas is presented. For the first antenna, YBCO patch with YBCO ground plane are considered. For the second antenna, the patch and the ground plane are with copper.

Improving the Performances of a High Tc Superconducting Circular Microstrip Antenna With Multilayered Configuration and Aniso Tropic Dielectrics

“…The complex conductivity σ of the superconducting film is determined by using London's equation and the model of Gorter and Gasimir as [9]:…”

“…Efficiency can be improved by the use of superconducting patch [8,9]. Nevertheless, these investigations which include the rectangular, circular and annular patch, have found that the superconducting microstrip antenna suffers from inherently narrow bandwidth.…”

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

“…The second advantage is the frequency independent penetration depth, unlike the common conductor. This means that dispersion introduced in superconducting devices will be negligible up to frequencies as high as hundreds of gigahertz [4]. The third advantage is that liquid nitrogen cheaper than liquid helium, as a refrigerant, can be used for cooling the superconducting devices because high Tc superconductors have Tc above the boiling point of liquid nitrogen, 77 K [2].…”

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

“…There are many techniques [10][11][12] to enhance the bandwidth of conventional microstrip antennas. 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].…”