Microstrip Tablet Reflective Array Antenna Research And Design

With the development of radar system and long distance communications, the needfor high gain antenna is unavoidable. Compared with traditional parabolic antennas andphased arrays, reflectarray is lower in profile, lighter in weight, higher in efficiency, andcheaper in cost. The radiation patterns of reflectarray can be reconfigured and the usageof which will be widely spread in the future.First of all, the history and recent development of reflectarray is introduced andconcluded in this paper.Secondly, detailed analysis and comparison are carried out to the phase curve of allkinds microstrip patches. Based on the theory of enhancing the bandwidth ofreflectarray, a Ku band reflectarray with double ring structure elements is designed andmanufactured. The measuring result implies that the gain and bandwidth matches wellto the simulation results. After that, the design principle of dual band co-aperturereflectarray is presented in this paper. A FSS structure is utilized as the metal ground ofKa band layer, with the existence of which interferes between two layers is minimizedto a relative low level. Simulation result shows that the performance of FSS backedreflectarray is almost the same compared with ground plane backed counterpart atcentral frequency.In order to reduce the vertical dimension of reflectarray, a folded structure withpolarizing grids is introduced and the design principle is also concluded. Simulationresult shows that the polarizing grids bring a little drawback to the performance ofreflectarray when the vertical dimension of reflectarray is cut down to a half. At last, anoffset feed reflectarray for DBS is designed and manufactured with a relative goodperformance.