优化的贴片型测量探头及其生物医学应用研究

Study on An Optimized Patch Probe and Its Biomedical Application

采用时域有限差分（FDTD）法结合遗传算法（GA）优化设计了适用于浅表生物组织高频测量的宽带同轴贴片探头，并用该探头测量了人体背部1～7GHz频带内的反射特性。优化设计出的圆形同轴贴片探头具有轴对称特点，辐射近场在生物组织中透人深、反射系数的频率响应特性好。所获得的人体背部反射特性的测量结果将为背部浅表组织电特性的重建提供有利的依据。

A wide-band patch probe excited by coaxial line, which is useful for noninvasive measurement of superficial tissues at high frequencies, is presented in this paper. Optimization of the probe is performed by genetic algorithm （GA） combined with Finite Difference Time Domain （FDTD）. Then the optimized round patch probe is used to measure reflection coefficient for 1 -7 GHz. The measured results show some interesting phenomena, which are very useful for reconstruction of electric properties of superficial tissues.