Research On Ultra-wideband Antenna And Array Design Technolog

With the rapid development of multifunctional electronic system and ubiquitous network based on 5G or 6G wireless electronic communication technology in military and civil fields,multifunctional integrated radio frequency system is gradually widely used to improve the integration degree of communication equipment.The high-performance UWB antenna and array are the key components of the integrated RF system.Aiming at the problems faced by UWB array antenna research,this paper focuses on different UWB low profile antenna design technologies,which can be divided into the following three parts:Firstly,the design method of UWB antenna in 5G millimeter band is studied.Based on Vivaldi antenna model,an antipodal Vivaldi antenna element design technology combining edge grooving and loading medium lens technology is proposed.The gain and impedance matching performance of the antenna element are improved effectively by regular elliptical shape grooves and wavefront phase distribution design of dielectric lens.The designed antenna element has a good radiation performance in the operating band of 20GHz-55 GHz,with reflection coefficient less than-15 d B.On this basis,a Vivaldi linear antenna array with a working bandwidth of 22GHz-37.5GHz and a relative bandwidth of 52.1% is designed and manufactured,and the experiment verifies that the array has a good performance of broadband impedance matching and radiation characteristics.Then,based on the Magneto-Electric dipole antenna model,a kind of ultra-wideband electromagnetic dipole antenna combining Substrate integrated waveguide(SIW)and MEdipole technology is proposed.Through the introduction of coplanar waveguide technology to reduce the transmission loss in the feed structure,the designed ME dipole antenna has low profile characteristics,simulation verified that it has 28.9GHz-46.2GHz passband bandwidth,relative bandwidth up to 46%,good radiation performance.On this basis,a differential feed network is introduced,and a 2×2 electromagnetic dipole antenna array with self-compensating phase structure is designed,with a working bandwidth of 29.1GHz-34.4GHz and a relative bandwidth of 16.4%.Finally,the design method of UWB antenna in X-Ku band is studied.Based on the planar tightly coupled dipole antenna model,an asymmetric UWB low profile tightly coupled dipole array antenna design method is proposed.The frequency selective surface technology is introduced to improve the matching impedance performance during scanning,and effectively reduce the antenna standing-wave ratio of large angle scanning.Considering the actual application scenarios,the truncation error of the array is reduced by using the dummy element setting.The radiation performance of the 10×10 array antenna is simulated and analyzed,and the scanning performance of the 10×10 array antenna is verified to be about ±45° and good aperture efficiency.A 6×6 antenna array sample is processed,and simple VSWR calculation is carried out.The experiment proves that the central element of the antenna array has good VSWR performance in passband.