Based on finite-difference time-domain method,this paper simulated the antenna radiation in the human di-gestive,and analyzed the influence of structural parameters on the radiation performance by the real three-dimensional digital human model. According to the characteristics of wireless capsule endoscopy working in the human digestive tract,a micro-strip antenna was designed for transmitting digestive tract data.The resonant frequency of designed an-tenna is 500 MHz,and the relative bandwidth is 8% when the return loss S11 is less than -10 dB.Within bandwidth the VSWR is below 2.0.The antenna was made of high-frequency dielectric materials.The result of experiment indica-ted that the antenna is adequate for the actual application of wireless capsule endoscope.%基于时域有限差分方法，采用真实人体数字三维模型，仿真了天线在人体消化道内辐射情况，分析了天线结构参数对天线辐射性能的影响。针对无线胶囊内窥镜( Wireless Capsule Endoscopy，WCE)在人体消化道内工作特点，设计了一款能够用于发送消化道内图像数据的WCE微带天线，该微带天线谐振频率为500 MHz，输入回波损耗S11<-10 dB时相对带宽为8％，带内VSWR<2.0，最后采用仿真优化后的结构参数和材料制作了天线，并进行了测试，得到了满足实际应用要求的微带天线。
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