Abstract: With the rapid development of wireless communication system,the antenna with wide bandwidth,high gain and small dimension is extensively concerned.In this paper,wave concept iterative process(WCIP)is presented with transmission lines theory to analyze two ultra wideband antennas with two and three layer structure.The circuit characteristic parameters and voltage standing wave ratio, are calculated by the method effectively. The calculation effect of WCIP is also analyzed by comparison with multiple-input multiple-output(MOM) and finite element method.The results show good agreement compared with the HFSS simulation data,which proves the correctness and effectiveness of WCIP.Besides,by compared the bandwidths of the two antennas,the influence of bandwidth by circuit layers is analyzed.