Zafa J, Zafa T, Zafa H, Sharif F
Australas Phys Eng Sci Med. 2015 Dec;38(4):593-601. doi: 10.1007/s13246-015-0384-z.
Slot antennas are generally preferred for localized liver cancer treatment modalities due to desired radiation characteristics. An iterative thermal/microwave numerical routine is used to analyze regular and miniature slot antenna configurations at 5.8 GHz. A thermal/microwave solver determines the specific absorption rate to malignant tissues as a pre- processing step to compute microwave solution in terms of propagation wave number, return loss and insertion loss. The regular and miniature dual slots antenna geometries were then developed to estimate the return loss characteristics against antennas slot lengths at a constant frequency of 5.8 GHz. Results reveal that the regular geometry has return loss less than -5 dB as compared to <-25 dB return loss for miniature slot antenna configuration. Furthermore, 5.8 GHz antenna geometry provides physical size reduction up to 50 %, lower fabrication cost and is a better minimally invasive choice due to further packed thermal ablation spots.
由于所需的辐射特性，缝隙天线通常是局部肝癌治疗方式的首选。采用迭代热/微波数值程序来分析5.8GHz下的常规和微型缝隙天线配置。热/微波求解器将比吸收率确定为恶性组织的预处理步骤，以便根据传播波数、回波损耗和插入损耗来计算微波解。然后开发了常规和微型双缝隙天线几何结构，以估计在5.8GHz恒定频率下相对于天线缝隙长度的回波损耗特性。结果表明，与微型缝隙天线配置的回波损耗<-25dB相比，常规几何结构的回波损耗小于-5dB。此外，5.8GHz天线几何结构可将物理尺寸减小多达50%，降低制造成本，并且由于热消融点进一步密集，是更好的微创选择。
