Abstract
In this work, a novel rotation approach for the antenna elements of a linear phased array is presented. The proposed method improves by up to 14 dB the cross-polarization level within the main beam by performing a sequential 90° rotation of the identical array elements, and achieving measured cross-polarization suppressions of 40 dB. This configuration is validated by means of simulation and measurements of a manufactured linear array of five dual-polarized cavity-box aperture coupled stacked patch antennas operating in L-Band, and considering both uniform amplitude and phase distribution and beamforming with amplitude tapering. The analysis is further extended by applying and comparing the proposed design with the 180° rotation and non-rotation topologies. This technique is expected to be used for the next generation L-Band Airborne Synthetic Aperture Radar Sensor of the German Aerospace Center (DLR).
Highlights
Synthetic Aperture Radar (SAR) has become nowadays one of the most important fields of remote sensing
In order to provide a fairer comparison, the proposed sequential 90° rotation topology is extended to the case of a planar array of 5 × 5 elements where the rotation approach is applied along the two antenna axes
A novel sequential 90° rotation approach of the antenna elements in a linear array designed for airborne SAR applications is presented
Summary
Synthetic Aperture Radar (SAR) has become nowadays one of the most important fields of remote sensing. A novel approach to perform a 90° sequential rotation of the same identical dual polarized cavity backed aperture coupled patch antenna elements of a linear array, for airborne SAR applications, is presented This technique improves the cross-polarization level within the main antenna beam of up to 14 dB in comparison with the standard array arrangement, providing cross-polarization suppression values above. Each configuration that corresponds to a different rotation pattern of the array elements is analyzed when applying a uniform phase and amplitude distribution, and beamforming case with triangular amplitude tapering These results are examined and the improvement of the cross-polarization level within the antenna main beam when performing a 90° sequential rotation is discussed
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