Design Of The Dual-polarized Co-aperture Antenna On Bomb At SC/X Band And UWB Vivaldi Antenna

The research is made based on research project.First,the research status and background of the relevant content and the significance of the selected topic are explained.Then,the research content is introduced.Finally,the research results and issues that need further study are given.The main research work contains three parts:The first part is the design of the UWB dual-polarized Vivaldi antenna.The second part is the design of dual-polarized co-aperture antenna on bomb at SC/X band.The thrid part is the design of miniaturazed ultra-wideband?UWB?Vivaldi antenna.The research works are as follow:?1?The UWB dual-polarized Vivaldi antennaAccording to the requeirements of the technical target,The difficulties in the design of the antenna are analyzed.Thus,the design of the UWB dual-polarized Vivaldi antenna is determined.The UWB is realized by the microstrip-slot-microsrip balun feed structure.The dual polarization is achieved by two antenna elements cross-embedded orthogonally.The simulation results indicate that the impedance bandwith of the antenna by VSWR?2 is3.3¹4.0GHz and the relative bandwidth is 124%,showing the UWB characteristic.The isolation between two ports of the antenna within impedance bandwidth is more than 30dB,showing the good independence between two ports.The gain of the antenna in the?=0°direction within impedance bandwidth is not less than 2.1 dB,and the cross-polarization is less than-10dB.The electrical characteristics of the antenna meet the technical target.?2?The dual-polarized co-aperture antenna on bomb at SC/X bandWith the engineering requirements of the technical target of the on bomb antenna,the UWB dual-polarized Vivaldi antenna in the last chapter is improved.According to the technical target,The difficulties in this design of the dual-polarized co-aperture antenna on bomb at SC/X band are analyzed and the antenna is designed.The CLL structure is used to achieve the nothed band between f₁^f₄.This method to realize dual-band and co-aperture can simplify the structure of quondam plan of co-aperture antenna and reduce cost effectively.The front-to-back ratio is also improved because the antenna is installed on the metal carrier platform.In the meantime,resistors and metal patch are loaded on the end of the opening patch slot.It can absorb current power and depress return loss so as to reduce the section size.In this paper,the antenna is simulated by ANSYS HFSS software simulation and prototyped.The simulation and measured results indicate that,within the range of given impedance band of technicle target,it is achieved that the gain of±60°beamwidth is more than-6dB.?3?The design of the miniaturazed UWB Vivaldi antennaAccording to the requeirements of the technical target,a miniaturazed UWB Vivaldi antenna is designed to meet the application requirements of miniaturization of Vivaldi antenna.The antenna uses microstrip-slotline conversion structure to feed,and the shape of the metal patch on the surface is changed to adjust impedance bandwidth.The size of antenna is 17mm×11.8mm×0.5mm?0.29?×0.20?×0.01??.In this paper,the antenna is simulated by ANSYS HFSS simulation and prototyped.The simulation and test results indicate that,the impedance bandwidth is 5.2¹7.1GHz and the relative bandwidth is106.7%.The gain of±60°beamwidth in XOZ and YOZ plane patterns is more than-1.0dB.Compared with traditional Vivaldi antennas,the size of antenna has obvious advantage of miniaturization.And within the UWB impedance band,the radiation performance is good.The electrical characteristics of the antenna meet the technical target.