中文摘要：

在超宽带（UWB）乳腺肿瘤检测系统中，采用Debye-Z．雏色散模型对乳房建模可以很好地近似人体组织的电导率及介电常数通过在乳腺模型中分别加入3个不同频带的超宽带天线阵列，带宽涵盖4～12GHz，采用共焦成像算法和波束形成算法对使用不同天线的色散模型进行成像对比，确定出最优性能的天线．2种成像算法均能准确获得肿瘤位置图像，使用频带为4．0～7．5GHz的天线对色散模型进行波束形成成像时，成像图分辨率较高，干扰抑制最好，可以清晰地分辨距离肋骨层仅10mm、直径为5mm的肿瘤．

英文摘要：

Three-dimensional Debye dispersion model of ultra-wide bandwidth （UWB）breast cancer detection system can better approximate to the conductivity and permittivity of human tissues. An optimum antenna was determined by applying confocal imaging and beamforming imaging to dispersion model with three antenna arrays of different fre- quency band, whose bandwidths range from 4 GHz to 12 GHz. Both imaging algorithms can achieve the accurate tumor position in images. However, a resultant image of beamforming using an antenna with the bandwidth of 4.0-- 7.5 GHz in dispersion model clearly shows a tumor, resolution ratio and interference rejection. 5 mm in diameter and 10 mm from the rib, with preferable