Abstract
The cross-polarization isolation (CPI) is a key parameter to assess the dual-polarization antenna because the cross-polarization closely affects the antenna application. A polarization state configuration (PSC) approach is proposed to configure the polarization state of the polarimetric phased array radar antenna. Unlike the traditional fixed polarization states such as the linear polarization (LP) and the circular polarization (CP), the PSC method modulates the polarization state of the radiated wave continuously. In addition, the optimal excitation magnitude and phase of the dual-polarization element is calculated, thereby maximizing the CPI. Most of the configured polarization state is the elliptical polarization (EP), and a lower cross-polarization level and higher CPI could be obtained. This method could expand the acceptable angle range when compared with the LP and CP waves. Numerical simulations and comparisons are conducted to manifest the validity of the proposed method.
Highlights
Thanks to the beam flexibility and the polarization capability of the polarimetric phased array radar (PPAR), it has attracted a lot of attention in weather observation, air traffic control, and air surveillance [1,2,3]
The results reveal that the value of ZDR and linear depolarization ratio (LDR) could meet the accuracy requirement for the polarization measurement
We develop the radiation model and solve the solution of the cross-polarization isolation (CPI) objective function based on a pair of crossed dipoles
Summary
Thanks to the beam flexibility and the polarization capability of the polarimetric phased array radar (PPAR), it has attracted a lot of attention in weather observation, air traffic control, and air surveillance [1,2,3]. The polarization state configuration (PSC) technique is an alternative strategy to reduce the cross-polarization level. The requirement of the cross-polarization level for the accurate polarimetric measurement is strict for the Alternate Transmission and Simultaneous Reception (ATSR) mode (−25 dB). The polarization state is necessary to be modulated optimally to reduce the cross-polarization level, especially for the polarization measurement applications. To suppress the cross-polar component, a PSC method is proposed to obtain the desired polarization state. We assume that the RHEP is the co-polarization component, and the LHEP is the cross-polarization component This pair of orthogonal vectors are antipodal points on the surface of a unit sphere.
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