Novel Balun Structure for Dipole Antenna

摘要

A novel balun structure for dipole antenna ,which is based on the current distribution on parallel micros-trip lines and the emission cancellation characteristic of close equal and opposite currents ,is proposed .The princi-ple of the balun structure is first elaborated and verified .Then ,a dipole antenna with resonance at 2 .45 GHz is constructed using the balun and its radiation pattern is measured .The simulated and measured reflection coeffi-cients (S11 ) of the antenna are in good agreement 2—3 GHz .The relative bandwidth with an S11 of below -10 dB is more than 25% .The antenna also shows a good radiation pattern at 2 .45 GHz .The proposed structure can pro-vide a new balun design method for dipole antennas .