A rectangular DRA with a Sierpinski fractal defected ground structure has been simulated and experimentally tested for UWB operation to be used in the detection of breast tumor using monostatic radar-based microwave imaging (MRMI). The proposed fractal DRA is designed to cover UWB characteristics (5.6–14.2 GHz) and high peak gain (5.8 dB). Then it is used as a sensor for extracting S-parameters from the breast phantom for tumor detection. In this regard, the fractal DRA is positioned in front of phantom, revolved around it (10°) in elevation and azimuthal plane to collect backscattered signals (with/without tumor). For validation, an artificial phantom of breast consisting of three layers, gelatin (skin), petroleum jelly (fat) and wheat flour (tumor), with electrical properties same as that of human breast is prepared and the S-parameters are recorded at different intervals. The captured reflection parameters processed in different imaging algorithms are: delay and sum and coherent factor (DAS-CF) and delay multiply and sum and coherent factor (DMAS-CF) to reconstruct 2D images of the breast tumor using MATLAB. The simulated specific absorption rate of the proposed DRA on the breast phantom at the resonant frequencies of 6.1 and 13.9 GHz was observed to be 1.02 and 1.13 W/Kg, respectively, which is safe limit for human exposure.

已经对具有 Sierpinski 分形缺陷地面结构的矩形 DRA 进行了仿真和实验测试，以用于使用基于单站雷达的微波成像 (MRMI) 检测乳腺肿瘤的超宽带操作。所提出的分形 DRA 旨在涵盖 UWB 特性（5.6-14.2 GHz）和高峰值增益（5.8 dB）。然后将其用作传感器，从乳房模型中提取 S 参数以进行肿瘤检测。在这方面，分形 DRA 位于体模前面，在仰角和方位平面上围绕它（10°）旋转以收集反向散射信号（有/无肿瘤）。为了验证，由明胶（皮肤）、凡士林（脂肪）和小麦粉（肿瘤）三层组成的人造乳房模型，制备与人乳房电特性相同的电学特性，并以不同的时间间隔记录S参数。在不同成像算法中处理的捕获反射参数是：延迟和相干因子（DAS-CF）和延迟乘法和相干因子（DMAS-CF），以使用MATLAB重建乳腺肿瘤的二维图像。在 6.1 和 13.9 GHz 的共振频率下，所提出的 DRA 在乳房模型上的模拟比吸收率分别为 1.02 和 1.13 W/Kg，这是人体暴露的安全限值。