Rectenna is one of the critical components of wireless power transmission(WPT ) .Common rectangle patch microstrip antenna have its shortages which include oversize area ,high-cost ,difficult integration and so on .According to the design theory of circular microstrip antenna and a source of feed cavity model theory ,a novel 5 .8GHz circular microstrip re-ctenna is designed .Optimizing the designed circular microstrip rectenna using ADS2008 software ,which makes this receiving antenna area of circular microstrip rectenna nearly 4 times smaller than the same kind rectangle patch microstrip antenna .It not only greatly reduces the production cost ,but also is easy to be integrated and conformal ,more suitable to make up anten-na array .Experimental results show that power transmission efficiency of this rectenna system is above 70% ,which indirect-ly demonstrates the simulation and optimization of this microstrip rectenna availability using ADS2008 software .%整流天线是无线能量传输的关键部件之一。常用的矩形微带天线存在面积大、成本高、不易集成等不足。根据圆形微带天线设计理论和有馈源的空腔模型理论，设计了一种工作在5．8GHz 的新型圆形微带整流天线。经过ADS2008软件仿真优化使得该圆形微带整流天线的接收天线面积比同类矩形微带天线将近小4倍左右，这不仅大大降低了生产成本，而且易集成和共形，更适合组成天线阵。实验结果表明，该整流天线系统的输能效率可达到70％以上，间接说明了利用 ADS2008仿真优化该微带整流天线的可行性。
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