On The Airborne Circular Polarization Antennas And Slot Array

The research works with scientific projects include three parts in this thesis: 1, the engineering prototypes of airborne antennas with wide-band and circular polarization. 2, the engineering prototypes of micro-strip array antenna and micro-strip conformal antenna array on the cylinder. 3, the model of planar waveguide slot array antenna.Firstly, the design methods of antenna an ultra–wideband double-armed pyramid spiral antenna and two types of balun are presented and simulated by the software FEKO. According to the simulation results, two engineering prototypes of airborne antennas with wide-band and circular polarization are made. The measurement results are agreed well with the simulation results, which indicate that the design method is available and valid.Secondly, according to the requirements of the project, the design method of one feed point micro-strip radiator elements based on the theories of micro-strip antenna is presented, which are simulated by the software HFSS. And three engineering prototypes micro-strip array antennas (high gain circularly- polarized array, low side-lobe-level circularly- polarized micro-strip array and the cylindrical conformal circularly- polarized micro-strip array) are made and measured. The results measured are agreed well with the simulation results and that the design method is available and valid.Finally, the analyses of the airborne planar waveguide slot array antennas with high gain, low side-lobe-level are discussed. The models of 8*8 planar waveguide slot array antennas are developed, which are simulated by the software HFSS and FEKO. The simulation results achieve the target, which indicate that the model is available to be applied in engineering and establish good foundation for the design of this type antenna.