A modified broadband transmission line model for rectangular patch antennas

The purpose of this paper is to present a broadband circuit model for rectangular patch antennas. It has been shown that how the transmission line model can still be used to determine the input characteristic over a large band of frequencies with minor adjustments. The models developed by Deanley and Pues have been chosen as the basis for this work as they fairly complete and give good results. Pues model has been applied with adjustment for fundamental mode, whereas for obtaining accurate model for higher modes, Wilkinson power divider is used to combine them and filters and matching networks are added to obtain broadband circuit model, the effect of higher order modes excited in the patch, can easily be incorporated in CAD software, with little computational effort. Eventually, we have introduced a broadband circuit model for rectangular microstrip antennas. Finally our results are compared with the results obtained form Method of Moment for same antennas.