Female Wearable Device For Noninvasive Breast Cancer Treatment

In recent years, microwave thermal therapy has been generally recognized as a hot research method in cancer therapy and has been widely applied in clinic treatment due to its low side effect and high security. In order to design the female wearable devices, the thesis completes a series of research about the breast cancer therapy effects and the feasibility of the treatment.First of all, the cancer model with the mammary gland wrapping outside has been proposed for the first time. Compare to the former breast cancer model, it is more authentic to the realistic cancer circumstance. Through the simulation, the existence of gland doesn’t influence the focus ablation effect of chosen tumor which is 0.5 cm thickness. And the optimal Specific Absorption Ratio(SAR) distribution of tumor therapy effect occurs at a certain thickness of gland of 0.9 cm. It means that the fastest temperature increasing method can be obtained through this period. It provides the theoretical reference basis of selecting the best cancer therapy schedule.Secondly, a wearable slot antenna which is made of Felt has been proposed with the working frequency of 2.45 GHz. The antenna adopts traditional textile materials as the antenna’s substrate, at the same time simulates the 90 degree bending effect. The circular patch antennas are slotted in the tangential and normal directions that comparison with the direction of current. Tangential slot will increase local SAR values and with small change in other area, and normal directions slotted antenna has the characteristics of SAR tunability in local therapy. Then a 2.45 GHz rectangular patch antenna with same substrate have been simulated, and the results indicate that the highest SAR point occurs in the position almost 1.5 centimeters which is closer to the antenna than the highest E-field point without tumor inside. And the trend is more obvious when the gland radius become longer.Furthermore, the heart security has been studied with the presence of spherical conformal patch antennas. The conformal antennas with the higher permittivity and smaller physical size to the tradition. It`s more convenient to set as an array. Based on the one patch antenna`s model, the near-fields SAR distribution of two element antenna has been simulated and analyzed, the conclusion indicated that the only maximum SAR distribution of the tumor treatment(both for the center position and apart from the center position) can be obtained with adjusting the offset phase. At the same time, the least damaged of the health gland can be obtained with adjusting the difference offset phase with the center position tumor attributing to the antenna bend effect. So the thesis propose the solution of this kind of problems and provide the relevant theory fundamentals.At last, the circular antenna with 1mm slot was made of Felt and copper sheet has been manufactured. The S11 parameters has been tested with swine breast slice and the human breast phantom. Also, the bending effect have been tested with swine breast slice. Since the limitation of the experiment condition and the complexity of the human tissues and our phantom, we conduct the contrast test between human body phantom and swine breast slice to verify the correctness of experiment results.