The cross-polarization isolation (CPI) is a key parameter to assess the dual-polarization\nantenna because the cross-polarization closely affects the antenna application. A polarization state\nconfiguration (PSC) approach is proposed to configure the polarization state of the polarimetric\nphased array radar antenna. Unlike the traditional fixed polarization states such as the linear\npolarization (LP) and the circular polarization (CP), the PSC method modulates the polarization\nstate of the radiated wave continuously. In addition, the optimal excitation magnitude and phase\nof the dual-polarization element is calculated, thereby maximizing the CPI. Most of the configured\npolarization state is the elliptical polarization (EP), and a lower cross-polarization level and higher\nCPI could be obtained. This method could expand the acceptable angle range when compared with\nthe LP and CP waves. Numerical simulations and comparisons are conducted to manifest the validity\nof the proposed method.
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