Paulides Margarethus M, Bakker Jurriaan F, Chavannes Nicolas, Van Rhoon Gerard C
Erasmus MC-Daniel den Hoed Cancer Center, Department of Radiation Oncology, Section Hyperthermia, PO Box 5201, NL-3008 AE, Rotterdam, The Netherlands.
IEEE Trans Biomed Eng. 2007 Nov;54(11):2057-63. doi: 10.1109/TBME.2007.895111.
In this paper, we describe a specifically designed patch antenna that can be used as the basis antenna element of a clinical phased-array head and neck hyperthermia applicator. Using electromagnetic simulations we optimized the dimensions of a probe-fed patch antenna design for operation at 433 MHz. By several optimization steps we could converge to a theoretical reflection of -38 dB and a bandwidth (-15 dB) of 20 MHz (4.6%). Theoretically, the electrical performance of the antenna was satisfactory over a temperature range of 15 degrees C-35 degrees C, and stable for patient-antenna distances to as low as 4 cm. In an experimental cylindrical setup using six elements of the final patch design, we measured the impedance characteristics of the antenna 1) to establish its performance in the applicator and 2) to validate the simulations. For this experimental setup we simulated and measured comparable values: -21 dB reflection at 433 MHz and a bandwidth of 18.5 MHz. On the basis of this study, we anticipate good central interference of the fields of multiple antennas and conclude that this patch antenna design is very suitable for the clinical antenna array. In future research we will verify the electrical performance in a prototype applicator.
在本文中，我们描述了一种专门设计的贴片天线，它可用作临床相控阵头颈部热疗辐射器的基础天线元件。通过电磁模拟，我们优化了用于在433MHz频率下工作的探针馈电贴片天线设计的尺寸。经过几个优化步骤，我们能够将理论反射率收敛到-38dB，带宽（-15dB）达到20MHz（4.6%）。理论上，该天线在15摄氏度至35摄氏度的温度范围内电性能令人满意，并且对于低至4厘米的患者与天线距离也很稳定。在一个使用最终贴片设计的六个元件的实验圆柱形装置中，我们测量了天线的阻抗特性：1）以确定其在辐射器中的性能；2）以验证模拟结果。对于这个实验装置，我们模拟并测量了相当的值：在433MHz频率下反射率为-21dB，带宽为18.5MHz。基于这项研究，我们预计多个天线的场之间会有良好的中心干扰，并得出结论，这种贴片天线设计非常适合临床天线阵列。在未来的研究中，我们将在原型辐射器中验证电性能。
