Design of Dual-Slot Antipodal Vivaldi Ultra-Wideband Antenna
To address the limitations of traditional antipodal Vivaldi antennas in the low-frequency band and the low radiation gain across the entire frequency band,a novel double-slot antipodal Vivaldi ultra-wideband antenna has been designed.The proposed antenna features a dual-slot configuration,where the curvature of the inner slot line is greater than that of the outer slot line,and the length of the inner slot line is shorter than that of the outer slot line.The inner radiating arms on both sides of the dielectric substrate are connected through through-holes,which broadens the low-frequency bandwidth and improves the radiation performance of the antenna.Additionally,an exponential groove is added to the outer radiating arm of the antenna,which in-creases the low-frequency current path,further broadens the low-frequency bandwidth,and reduces the anten-na size.An exponential ultra-wideband power divider is used for feeding,which enhances the antenna's anti-interference performance.Simulation and measurement results indicate that the antenna achieves a maximum gain of 10.8 dBi,with a flat gain curve,excellent impedance matching characteristics,and good radiation performance over the frequency range of 2 to 18 GHz,enabling ultra-wideband transmission.
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维普
