High performance of coaxial feed UWB antenna for human brain microwave imaging

A 4×1 array Ultra wide band (UWB) antenna coaxially feed is proposed in this paper. Four copper circular patches are appropriately connected using quarter-wavelength transformer transmission line. Introduction of copper parasitic element and copper partial ground technique are applied in this proposed antenna. Taconic associated with 2.2 dielectric constant is utilized as the antenna substrate. The proposed antenna recorded reflection coefficient less than −10dB started from 2.6 GHz until 13.1 GHz which fulfilling the requirement of UWB. Dimensions of 80 mm × 45 mm and maximum gain of 12.12 dB made it as small and high gain UWB antenna. The antenna exhibit excellent radiation efficiency of more than 90% over the whole operated frequency and has 83% of usable fractional bandwidth. The proposed antenna performance finds it very suitable to be applied in human brain microwave imaging.