Modeling the superconducting effects on resonance and radiation characteristics of a cylindrical-rectangular microstrip antenna covered with a dielectric layer

In this work, the resonance and radiation characteristics of a superconducting cylindrical-rectangular microstrip antenna covered with a dielectric layer are studied using an electric field integral equation and the spectral-domain Green’s function. The effect of superconductivity of the patch is modeled by including surface complex impedance in the formulation. In order to validate the present method, numerical results for the cylindrical microstrip antenna with a perfectly conducting patch are presented and very good agreement has been demonstrated between our computed data and those found in the literature. Once the validity of the method is checked, the effect of the superconducting patch on resonance frequency, half-power bandwidth and radiation pattern of cylindrical rectangular microstrip patch is studied. It is found that the resonant frequency is affected significantly by the superconductivity property of the patch and the half-power bandwidth is considerably increased, which improves the narrow bandwidth characteristics of the microstrip structure. Further results show that a thin superconductor patch has a significant effect on the E-plane radiation pattern.