Branch number and height effects on the multi-branch tri-band monopole antenna resonance

Abstract

The branch number and height effects on tri-band antenna resonance was analyzed. The antenna consisted of a monopole and two or four branches connected circumferentially to the monopole a short distance away from the feed point. Method of moments was used to find the input impedance and genetic algorithm was used for searching the resonating monopole and branch length. The optimal height of the branch was found to be 1.875 cm and increasing the number of branches improved the antenna bandwidth at 1.8 and 2.4 GHz.