Maccarini Paolo F, Arunachalam Kavitha, Juang Titania, De Luca Valeria, Rangarao Sneha, Neumann Daniel, Martins Carlos Daniel, Craciunescu Oana, Stauffer Paul R
Department of Radiation Oncology, Duke University, Hospital South on Trent Drive, Durham, NC - 27710, phone.: +1 919 668 7418, fax: +1 919 668 7418.
Int Conf Electromagn Adv Appl. 2009. doi: 10.1109/ICEAA.2009.5297299.
It has been recently shown that chestwall recurrence of breast cancer and many other superficial diseases can be successfully treated with the combination of radiation, chemotherapy and hyperthermia. Conformal microwave antenna array for hyperthermia treatment of large area superficial diseases can significantly increase patient comfort while at the same time facilitate treatment of larger and more irregularly shaped disease. A large number of small efficient antennas is preferable for improved control of heating, as the disease can be more accurately contoured and the lower power requirement correlates with system reliability, linearity and reduced cost. Thus, starting from the initially proposed square slot antennas, we investigated new designs for multi-fed slot antennas of several shapes that maximize slot perimeter while reducing radiating area, thus increasing antenna efficiency. Simulations were performed with commercial electromagnetic simulation software packages (Ansoft HFSS) to demonstrate that the antenna size reduction method is effective for several dual concentric conductor (DCC) aperture shapes and operating frequencies. The theoretical simulations allowed the development of a set of design rules for multi-fed DCC slot antennas that facilitate conformal heat treatments of irregular size and shape disease with large multi-element arrays. Independently on the shape, it is shown that the perimeter of 10cm at 915 MHz delivers optimal radiation pattern and efficiency. While the maximum radiation is obtained for a circular pattern the rectangular shape is the one that feels more efficiently the array space.
最近研究表明，乳腺癌及许多其他浅表疾病的胸壁复发可以通过放疗、化疗和热疗联合成功治疗。用于大面积浅表疾病热疗的共形微波天线阵列可显著提高患者舒适度，同时便于治疗更大且形状更不规则的疾病。大量小型高效天线有利于更好地控制加热，因为这样可以更精确地勾勒疾病轮廓，而且较低的功率需求与系统可靠性、线性度以及成本降低相关。因此，从最初提出的方槽天线开始，我们研究了几种形状的多馈电槽天线的新设计，这些设计在减小辐射面积的同时最大化槽周长，从而提高天线效率。使用商业电磁仿真软件包（Ansoft HFSS）进行了仿真，以证明天线尺寸减小方法对于几种双同心导体（DCC）孔径形状和工作频率是有效的。理论仿真为多馈电DCC槽天线制定了一套设计规则，便于使用大型多单元阵列对不规则尺寸和形状的疾病进行共形热处理。无论形状如何，结果表明在915MHz时10cm的周长能提供最佳辐射方向图和效率。虽然圆形方向图可获得最大辐射，但矩形形状能更有效地利用阵列空间。
