Mechanical Rotating Arrays for Sidelobe Suppression

A novel approach by utilizing the fast mechanical rotation of arrays has been proposed for low sidelobe levels by integrating the rotational time-varying radiation pattern in a short time. From the experimental measured radiation pattern for a 4-element circular polarized array antenna with 0.87 element spacing, the mainlobe of the radiation pattern for the rotation array is almost the same as the non-rotation array, while the sidelobe level is decreased by 14.2 dB from the non-rotation array. This technique could be potentially applied for sensing and radar systems that require high SNR and frequency resolution by integrating the received signals within the rotation period.