A Gaussian tapered slot antenna based on post-wall structured slotline for improvement of cross-polarization for ultra-wideband\napplications is proposed and experimentally demonstrated.Theantenna is composed of two pairs of Gaussian tapered slotlinewhich\nhave the same structure printed on both sides of the PCB, two metallic via arrays positioned along the slot edges, and two terminal\nresistors.Themetallic via arrays are used to reduce the characteristic impedance of the conventional slotline which forma post-wall\nslotline and thus can be fed by a coaxial connector directly.More importantly, the balanced symmetrical post-wall structure ensures\nlow cross-polarization levels of the antenna. The Gaussian tapered edges and the terminal resistors diminish reflected signal and\nthus can enlarge the bandwidth significantly.Good agreements between the simulated and the measured results have been observed.\nResults show that the proposed antenna exhibits a âË?â??10 dB impedance bandwidth from1.5GHz to 20GHz, a maximum realized gain\nof 12 dBi, and the broadside cross-polarization level is averaged about âË?â??32 dB in the lower frequency band and âË?â??25 dB in the higher\nfrequency band with a maximum value of âË?â??22 dB in the whole working frequency band.
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