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为实现ps脉冲电场(ps PEF)经冲激脉冲辐射天线(IRA)发射后在近似实际乳房组织(电导率为0.5 S/m)模型中的有效聚焦,采用计算机仿真技术(CST)Microwave studio软件构建了天线及乳房组织模型并计算了ps PEF在其中的聚焦特性。结果表明:引入优化参数的损耗介质材料(厚度为1 cm,电导率为10 S/m)衰减小路径角电场,最终能够实现ps PEF在焦点F2处的聚焦(电场强度E=0.08 V/m);损耗材料的引入使得焦点F2处的电场强度大大减小,引入损耗介质透镜,不仅实现了ps PEF在乳房组织模型中的良好聚焦,而且焦点F2处的电场强度(E=0.45 V/m)大大增强。因此,优化设计的损耗介质透镜能够实现ps PEF在生物组织中的有效聚焦。
In order to realize the effective focusing of the ps PEF in an approximate real breast tissue (0.5 S / m conductivity) after being implanted by an impulse pulsed radiation antenna (IRA), a computer simulation technique (CST) Microwave studio software Antenna and breast tissue models were constructed and the focusing characteristics of ps PEF were calculated. The results show that the attenuated small-path angular electric field with the optimized parameters of lossy dielectric material (thickness of 1 cm and conductivity of 10 S / m) can finally achieve the focusing of ps PEF at the focal point F2 (electric field strength E = 0.08 V / m ). The introduction of lossy material greatly reduces the electric field intensity at the focal point F2. The introduction of a lossy dielectric lens not only achieves a good focusing of the ps PEF in the breast tissue model, but also the electric field intensity at the focus F2 (E = 0.45 V / m ) Greatly enhanced. Therefore, optimally designed lossy media lenses enable efficient focusing of ps PEF in biological tissues.