Analysis of cylindrical printed slot and slot-coupled microstrip antennas

Analysis of microstripline-fed printed slot and slot-coupled microstrip antennas becomes complicated, when the actual currents on the feed line are modeled. Recently, the complexity of the theoretical analysis for such antenna structures has been reduced by using the reciprocity analysis, which considers only the fundamental-mode propagation on the microstrip feedline. The obtained results based on the reciprocity analysis are also found to be in good agreement with the measured data. In this paper, the extension of this method to the analysis of such antenna structures on a cylindrical body is described. Both the input impedance and radiation pattern for the cylindrical printed slot and slot-coupled microstrip antennas with various curvature radii are calculated and discussed.