Research On Reflector Antenna And Reflector Array Antenna Based On The Principle Of Optical Path Foldin

With the rapid development of aerospace and electronic communication technology,the performance requirements of various radar and communication systems are increasing day by day.As the main electromagnetic wave transceiver equipment,antennas play an indispensable role in wireless communication systems.The gain,bandwidth and directivity of antennas have an important impact on the performance of the entire communication system.In this paper,according to the demand of wireless communication system for high gain antenna,the reflector antenna and reflectarray antenna based on the principle of optical path conversion are designed.The optical path folded reflector antenna and folded reflectarray antenna are studied.Aiming at the problems of high profile and aperture occlusion in traditional parabolic antenna,a reflector antenna based on optical path conversion principle is designed.The main reflector adopts a three-dimensional corrugated structure,and the polarization-twisting is realized by adjusting the width and depth of the three-dimensional corrugated groove.The subreflector adopts a single-layer polarization grating to realize the polarization selection of the incident wave;the feed adopts a simple rectangular waveguide horn.The performance and design rationality of the antenna are preliminarily explored by simulating the unit and array.Finally,the antenna is fabricated based on 3D printing technology.The measured results show that the gain of the antenna in Ka-band is not less than 25 d Bi,and the sidelobe level is better than-20 d B.The antenna has the characteristics of high gain,low sidelobe and low profile.At the same time,this paper also conducts in-depth research on the folded reflectarray antenna,and designs a circularly polarized folded reflectarray antenna,which has high-gain and low-profile characteristics in the X-band.The main reflector unit adopts a single-layer rectangular patch structure,and phase compensation and polarization-twisting can be achieved by changing the patch size.The feed is a rectangular corrugated horn with a gain of 12.1 d Bi at10 GHz.The subreflector adopts a multi-layer structure,which has the transmission performance of single polarization and the conversion function of line-circular polarization.In addition,in order to improve the axial ratio bandwidth of the antenna,the sequential rotation technique(SQR)is applied to the main and secondary reflectors of the antenna.The measured results show that the 3 d B axial ratio bandwidth of the antenna ranges from 8.7 GHz to 11.2GHz with a peak gain of 28.2 d Bi.Finally,based on the folded reflectarray antenna,the sub-reflector is studied,and a circularly polarized folded reflectarray antenna based on the slot coupling mechanism is designed,which can realize the conversion from linear polarization wave to circular polarization wave while satisfying high gain and low profile.The subreflector uses a simple Sshaped dipole to achieve linear-circular polarization conversion.The main reflection surface is an open rectangular ring.Changing the size of the open rectangular ring and the size of the opening can achieve phase compensation and polarization-twisting.Through CST array simulation,the 3 d B axial ratio bandwidth of the antenna can be obtained from 26.5 GHz to32.5 GHz,and the peak gain is 26.2 dBi.