Development And Array Of High Peak Power Ultra-wideband Antenna

High-power ultra-wideband radiation sources and high-power ultra-wideband(UWB)pulse radiation systems have received more and more attention due to their various applications from commercial to military.Generally speaking,the rising edge of a radiation pulse is several hundred picoseconds,and its pulse width is only a few nanoseconds.In order to effectively transmit high high-power UWB pulses to the target,the antenna must have the following characteristics:The antenna must achieve directional radiation,must achieve matching over a wide bandwidth(reflection coefficient less than-10d B),and must be low-dispersion to radiate discrete waves.Another important criterion for the design of an antenna is its size,and a small size antenna is conducive to forming an antenna array.In addition,the miniaturization of the antenna can also avoid the cancellation of pulses in the radiation space when forming an array.Finally,the antenna must have high electrical strength to prevent discharges from damaging the antenna system.In this paper,a compact electromagnetic dipole high peak power UWB antenna is designed based on the principle of capacitive and inductive energy storage of electric dipole and magnetic dipole in the near field.On this basis,the antenna is improved to make its volume smaller.Finally,a time domain antenna array is designed for the unit antenna.The main contents of this paper are as follows.First,this article briefly analyzes the research background and significance of high peak power UWB radiation.After comparing the advantages and disadvantages of several antennas,the electromagnetic dipole combined antenna was selected as the basic model for designing a high peak power ultra-wideband antenna.The electric dipole,magnetic dipole and the related ultra-wideband technology are also briefly introduced.Two antennas with peak power capacity?1.42MW are designed in this paper.In this paper,the shape of the electric dipole,the arrangement of the magnetic dipole and the feed design of the electromagnetic dipole antenna are discussed.Their physical size is400mm×235mm×345mm,263mm×93mm×286mm,and their bandwidth is0.151-2.82GHz(17.68:1),0.22-3.27GHz(13.86:1),respectively.The width of the 0.707lobe in the time domain pattern of E-plane and H-plane is no more than±60~°,and the before-and-after ratio is 9.63d B,10.21d B,respectively.Both antennas achieve directional radiation at peak power and low backward radiation levels and both have good low frequency radiation levels.After the design is completed,the paper discusses the related theoretical system of the time domain antenna array,and uses the first design of the time domain antenna array,the synthesis efficiency of the array is higher,after testing its waveform fidelity is also relatively high.Finally,the advantages and disadvantages of the designed electromagnetic dipole combined antenna and the time domain array are analyzed and summarized,the design regrets and subsequent improvement suggestions are put forward,and the prospect of the high peak power UWB antenna is forecasted.