Resonant Frequency of Cavity-Backed Rectangular Patch Antenna with Metal Column

A finite element-boundary integral formulation was introduced to investigate the resonant frequency of a cavity-backed rectangular patch antenna with a metal column. The effects of the size of the metal column and the position of feeding points on the resonant frequency were discussed in detail. The research results show that the resonant frequency of the cavity-backed rectangular patch antenna rises with the size increasing of the metal column, and its inner field is different from that of a common patch antenna.