X波段高功率容量低剖面连续横向枝节天线OA

[Background]With the development of high-power microwave(HPM)systems,antennas are required to achieve high gain and high power-handling capability while being as miniaturized and compact as possible.The continuous transverse stub(CTS)antenna,featuring high gain and high power capacity,meets the demands of HPM system development.[Purpose]To address the structural complexity and lack of compactness in conventional CTS antenna feed systems,which hinder overall antenna miniaturization,this paper proposes a novel radial-line feed system.The aim is to output a quasi-TEM mode in a planar waveguide via two-stage reflecting surfaces,thereby significantly reducing the complexity of the multi-way power-dividing feed structure.[Methods]The proposed feed system was based on quasi-optical principles.The incident coaxial waveguide TEM signal was first converted into a TEM mode propagating in the radial line.Subsequently,the first-stage parabolic reflecting surface adjusted the electric field amplitude within the radial line waveguide,while the second-stage shaped reflecting surface adjusted the electric field phase.[Results]Simulation results show that within the 4-11 GHz frequency band,the output mode of the radial-line power-dividing feed system loaded with shaped reflecting surfaces is quasi-TEM.The electric field phase difference at the output port aperture is less than±15°,the variation in central electric field amplitude is within±2 dB,and the port reflection coefficient remains below-20 dB.At 9.3 GHz,the CTS traveling-wave array antenna fed by this structure achieves an aperture efficiency of 87%,and the input port reflection coefficient is below-30 dB.Under a microwave pulse breakdown threshold of 60 MV/m,the overall power-handling capability of the antenna system is approximately 2 GW.[Conclusions]The proposed radial-line feed system effectively simplifies the feed structure of the CTS antenna,achieving good output mode purity,electric field amplitude-phase consistency,and low reflection over a wide frequency band,while maintaining high aperture efficiency and power-handling capability.It satisfies the requirements of compactness and high performance for antennas used in high-power microwave systems.