Scattering Beam Reconfigurable Circularly Polarized Antenna Array

A circularly polarized antenna array with reconfigurable scattering patterns is proposed. The proposed antenna unit integrates four p-i-n diodes, enabling the unit to achieve two operational states by tuning the states of these diodes. Both states of the unit exhibit a 180° reflection phase difference but show similar radiation characteristics. Therefore, by tuning the states of the unit, the proposed array allows for dynamic manipulation of the scattering beam without compromising the radiation performance, thereby significantly reducing the in-band monostatic and bistatic RCS. Finally, the reconfigurable units form an 8×8 circularly polarized antenna array. The proposed circularly polarized antenna array demonstrates in-band low scattering characteristics under both x- and y-polarized incidences, along with the capability to adjust the shape of its scattering beam. In addition, the proposed antenna array can maintain good and stable circular polarization performance in different states.