A new ultra-wideband antenna based on a uniform narrow slot is proposed. The slot radiator is fed by a pair of differential microstrip-lines, to implement a balanced and vialess antenna. The multiple-mode resonances of the radiator are excited simultaneously to form an ultra-wideband radiation, by optimizing antenna dimensions and port impedance. Comparing with other ultra-wideband slot antennas, this antenna has improved radiation patterns and low cross polarization due to its symmetry in structure. Antenna samples are designed and fabricated for verification. The measured impedance bandwidth has successfully achieved a fractional bandwidth of 106% (VSWR < 2.5). The radiation patterns are also measured and agree well with the prediction.
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