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中文摘要：
在生物组织的低温保存中，微波复温和降温方法得到了广泛研究，但低温下材料物性参数一直比较缺乏。为研究微波复温的加热过程和微波降温的非热效应提供物性参数，并对其机理进行探索，本文应用波导传输发射法测量生物组织在-43～30℃，频率为8～12GHz时的介电常数与电导率。首先通过测量有机材料对测量系统进行验证，证明本文所提出的系统具有较好的测量精度与可重复性，然后测量了在生物组织中分布很广的脂肪的介电常数与电导率，给出了几组样品的实验测量值，并讨论了单个样品的介电常数与电导率随温度和频率变化的规律。
英文摘要：
Microwave rewarming have been researched for many years, but the dielectric properties of biomaterial are always absent. The goal of the thesis is to discover a reliable and effective method to accurately determine the dielectric of some biomaterials at low temperature. At first, the discussion of the microwave methodology for the dielectric is presented. By comparison, the transmission line method is chosen as it can be easily implemented while still retaining a satisfactory precision. The precision of the method is proved by measuring the dielectric of polymer. Then the dielectric properties of porcine fat have been measured at temperature range from - 43℃ to 30℃, frequent range from 8.0GHz to 12GHz. The corresponding numerical solutions are determined with the help of software applications. At last, the discussion continues further with the generalization of the dielectric property for biomaterial varied with temperature and frequency based on the experimental data.
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