Design Of Ku Band Broadband Dual-polarized Low Side-lobe Microstrip Array Antenna

With the rapid development of wireless communication system,the data transmission rate and radar detection accuracy poses a big challenge.The beam width of the antenna determines the resolution of the distance and azimuth.Using different polarizations to identify the same object,we can get more information of the target.Dual-polarized antenna can achieve polarization diversity in the same frequency band,and can effectively avoid the impact of multipath fading.As such,it has been widely used in satellite communications,radar detection systems and many other fields.This thesis primarily focuses on the dual-polarized microstrip antenna in the need of synthetic aperture radar’s engineering requirement.First,the element structure and several feeding methods are analyzed based on the radiation mechanism of microstrip patch.Next,the array layout is derived from the performance index and antenna theory.To improve the isolation and reduce the cross polarization,two layered power dividision network is optimized.Furthermore,array weighting is used to control the side-lobe level of the antenna.Finally,the array simulation and optimization are completed.From the simulation results,the dual-polarized aperture-coupled stacked patch antenna effectively broadens the impedance bandwidth,the introduction of metallic via holes improves the isolation,and the anti-phased technique reduces the level of cross-polarization.In addition,the Chebyshev current distribution of the feeding network realizes the requirement of low side lobe level.This thesis discusses the manufacturing processes,the antenna can be manufactured through the available processing technology.