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

Abstract

. Improving the performances of a high Tc superconducting circular microstrip antenna with multilayered configuration and anisotropic dielectrics. Progress In Electromagnetics Research, EMW Publishing, 2010, vol. 18, pp 169-183. <hal-00648571> Progress In Electromagnetics Research C, Vol. 18, 169-183, 2011 IMPROVING Abstract-The moment method technique has been improved to investigate the scattering properties of high T c superconducting circular antennas with anisotropic substrate in multi-layered configuration. In this method, the electric field integral equation for a current element on a grounded dielectric slab of infinite extent was developed by basis functions involving Chebyshev polynomials. An improved analytical model is presented taking into account anisotropic substrate, superconducting material for the circular patch and multilayered structure. To validate the theoretical results, an experimental study has been performed for a perfectly conducting circular patch on a single layer, with and without air gap. Good agreements were obtained between our theory and measurements. Effects of temperature and thickness of a superconducting film are also reported and discussed. The performances of high T c superconducting circular antennas were improved by the use of uniaxial anisotropy substrate and multilayer configuration.

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 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.…”

“…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.…”

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

“…In order to confirm the computation accuracy of the spectral domain approach, our results are compared with experimental and recent theoretical data [18][19][20]. Experimental and numerical evaluations have been performed with a patch for different radius a, printed on single substrate (d 1 = 0) with relative permittivity ε r = 2.43 and thickness d 2 = 0.49 mm.…”

TRANSPARENT ANTENNA DESIGN FOR WiMAX APPLICATION

“…In addition, an adhesive material was used between the glass and coated polyester sheet, AgHT-4, resulting in an air-gap between them. The air-gap will increase the overall height of the transparent antenna and thus widening the BW [21,22]. The material itself (AgHT-4) has high sheet resistance, and by applying a layer of highly conductive coating or metallization at high current density, which is at the arc-shaped slot, will improve the antenna performance [7].…”