| The research on reconfigurable antenna technology is one of the hot spot in antenna field nowadays. The reconfigurable antenna can fulfill functions of multi-antenna on only on antenna, in order to increase the capabilities and functions of wireless integrated information systems and widen their bandwidths, overcome the drawbacks, the concept of reconfigurable antenna is presented. At present, this work is still at developing stage, and much unknown domains need to be overcome.In this paper, one kind of reconfigurable antenna--polarization reconfigurable antenna is analyzed preliminary, after brief introduction of microstrip antenna and polarization, advantages of adopting circular polarization antenna in wireless communication systems especially MIMO system is analyzed. Based on the summary of research results on polarization reconfigurable antenna of the world in recent years, ring slot structure is adopted to design polarization reconfigurable antenna.Through the theoretically analyze and numerical emulation, effect of parameters modification on ring slot structure antenna is analyzed. Two kinds of method which can widen antenna's bandwidths for 4 times is presented and validated through emulation. Thereafter, based on the theory of circular polarization, through modifying feed network of antenna, clockwise and counter-clockwise circular polarization antenna are designed respectively.Based on the symmetrical of clockwise and counter-clockwise circular polarization antenna structure, MEMS switch are used on antenna, clockwise and counter-clockwise circular polarization reconfigurable antenna is designed. Resorted to emulator software, effects of parameters on antenna performance analyze and structure of antenna modified, then the structure satisfied request is obtained. At last, the method of widen antenna's bandwidth is adopted, through emulation and measured, this method is proved to be availability. |
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