Application of Characteristic Modes on High Gain UWB Platform Integrated Monopole Antenna

This paper discusses the cavity's influence on UWB (ultrawideband) monopole antenna structure using the theory of characteristic modes(TCM). An addition of square cavity converted the omnidirectional monopole to the unidirectional, high gain antenna. The cavity-backed antenna exhibits lesser impedance bandwidth and higher gain than monopole antenna. The change in antenna parameters due to platform or cavity has been analyzed using characteristic modes. The modal weighting coefficient gives the physical insight into the altered current modes due to cavity. It has been shown that identifying specific cavity modes can help in addressing performance deterioration of the antenna.