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NUMERICALANALYSISOFATUNABLERECTANGULARPATCHANTENNAWITHONETUNINGPOSTLIUYUNLIN(刘运林)YANGRUGUI(杨儒贵)RENLANG(任朗)INSTITUTEOFELECTROM...“,”The finite element method(FEM) is applied to a thin substrate rectangular antenna with a shorting post. The results of the resonant frequencies are in good agreement with the experimental data. The input impedances are calculated and the results are presented. In principle, this method is applicable to a microstrip antenna with shorting posts in arbitrary locations.