Reconfigurable Tri-Band UWB Antenna Using Single Winding Balun Structure

This paper proposes a novel tri-band reconfigurable UWB antenna using a balun structure. The proposed UWB antenna achieves tri-band frequency of operation in two configurations as Step-up and step-down transformer configurations. The proposed reconfigurable design using balun structure suppresses harmonics and reduces overall power consumption. The performance of the proposed tri-band reconfigurable UWB antenna is analyzed with and without balun structure. The introduction of balun structure in the proposed antenna design achieves triband operation whereas without balun structure it operates only in the dual band. A proposed tri-band UWB antenna prototype with balun structures is designed, simulated, fabricated, and tested. The simulated and measured results show a good degree of agreement within the tri-band operating frequency. The proposed balun structure improves the overall performance of the antenna by suppressing the harmonics in the operating frequency band and achieves wider bandwidth at operating frequencies with return loss above − 10db and peak gain of 8.7 dB.