An UWB low cross-polarization sliced V-notch antenna array

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ABSTRACT In this paper, the sliced V-notch antenna (SVA) array theory is presented, in which large-scale array elements are generated by slicing in the form of V-notches on the fin region of the Vivaldi antenna. This optimization concept achieves lower cross-polarization in broad bandwidth and wide-angle scanning to overcome polarization drawbacks in Vivaldi arrays. According to the slice notch antenna (SNA) array theory, the vertical-to-horizontal current potentials along the upper radiator fin in Vivaldi-type arrays are the primary factor affecting the cross-polarization ratio of the array. The V-notch of the SVA array ensures that the horizontal and vertical lengths of the major slice remain constant, while the array exhibits excellent ultra-wideband impedance matching through an increased slice number and notch angle tuning. Theoretical analysis and design validation of SVA arrays are illustrated, demonstrating a superior level of cross-polarization in wide-angle scanning due to improvements in impedance matching. A single-polarized all-metal SVA array model of 1.2 ~ 12 GHz is shown, resulting in a peak cross-polarization ratio of 5 dB and 25 dB superior to the SNA array model and the Vivaldi array model, respectively. In addition, the cross-polarization level of the SVA is significantly higher than that of the SNA within the 45° scanning range.