Integrated Design And Realization Of Conformal UWB Antenna And Radome

Due to the increasingly fierce electronic information warfare,in order to gain an advantage in the information warfare,people conform the antenna to the surface of missiles and various aircraft to achieve the purpose of improving the working performance of the radar.Therefore,researchers are paying more and more attention to the study of conformal antennas.Since the conformal carrier can be large or small,the methods for analyzing the integration of the conformal antenna and the carrier platform are also different.For example,to study the integration of electrically large antennas and carriers,physical optics and geometric optics can be used to study the electrical small size.The integration of antenna and carrier platform can use moment method and finite element method.The antenna and carrier conformal are becoming more and more important in practical applications.The main research contents of this article are as follows:1.Analyzing the integration theory of antenna and radome.This paper first analyzed the boundary conditions using Green's function,and then analyzedthe application of algorithms such as caliber integral-surface integral and physical optics in the radome.According to Fresnel's law,the reflection and transmission of different media interfaces were analyzed,and the antenna matching design was combined with the impedance matching theory.2.Conformal UWB log-periodic antenna and conformal integration of antenna and radome were designed.Based on the principle of self-similarity,this paper designed an ultra-wideband log-periodic antenna.By optimizing the antenna spacing factor,scale factor and structural angle,a 1:18 bandwidth ratio was achieved.In order to broaden the beam width,the optimization of the scale factor and the structure angle finally realized the E-plane and the H-plane with a beam width greater than 80°,the gain in the entire frequency band was greater than 5d B,and the gain change was relatively flat.Using low-temperature co-fired ceramic technology,the antenna was fired on the inner wall of the radome to complete the integrated design of the conformal antenna and the radome.The results showed that the log-period antenna had good conformal characteristics,and the low-temperature co-fired ceramic technology could also well complete the integrated design of the antenna and the radome.The designed radome had good wave-transmitting performance.3.Conformal UWB dielectric antenna and the integration of dielectric antenna and radome were designed.According to the principle of dielectric antenna,an ultra-wideband dielectric antenna was designed.Through multi-layer dielectric stacking,a 1:9 bandwidth ratio of dielectric antennas was achieved.By adding a hexagonal matching structure to the dielectric antenna,the impedance bandwidth was expanded.A coplanar waveguide was used to feed the dielectric antenna,and finally a wide beam with an E-plane beam width greater than 40° was achieved,and the gain of the antenna at each frequency point was greater than 5d B.Secondly,the integration of the dielectric antenna and the radome was studied.When the dielectric antenna was directly simulated with the radome,the hood body would affect the radiation characteristics of the antenna inside the hood.In order to reduce this effect,this article used the absorbing material to absorb the wave The structure acted as a cylindrical wall of the radome to reduce the impact of the radome wall on the antenna.The results showed that the absorbing structure wall had better wave-transmitting performance at the low frequency end compared to the ordinary radome.