基于变容二极管的高功率波束扫描折叠反射阵列天线设计OA

To meet the requirements of high power microwave(HPM)systems for antennas with high power capacity,low profile and flexible beam steering,this work proposed a varactor-tuned folded reflectarray antenna(FRA).The main reflectarray surface adopted a four-arm patch element with varactor diodes in orthogonal directions.The design of a multilayer and rounded-corner structure suppressed local electric field concentration and increased the power handling capacity.The sub-reflector used metallic gratings with polarization selectivity,and the feed was a linearly polarized horn antenna.Independent bias tuning enabled each element to realize continuous 360° phase control and linear to cross-linear polarization conversion simultaneously,with a polarization conversion ratio(PCR)above 97.5%.The sub-reflector folded the propagation path and reduced the antenna profile.A 9×9 prototype was fabricated.At 4.3 GHz,the antenna achieved 15.39 dBi gain and 41.36%aperture efficiency.Under a 0.1 MPa SF6 environment,the power reached reached 3.6 MW,and a beam-steering range of-20° to 20° was obtained.The design provides an approach for low profile and beam-steerable reflectarray antennas in HPM applications.