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在微波热疗临床治疗中,当肿瘤体积过大或位置较深时,经常需要多个辐射器对肿瘤组织同时辐照。功率分配器可以将输入的微波信号能量分成多路,能量可以等分或不等分地分配到各辐射器,实现对肿瘤组织的有效加热治疗。研制高隔离度的微带结构的一分二Wilkinson型功分器,采用三节阶梯阻抗方式,通过对等效电路的阻抗分析,给出设计参数,并基于Ansoft HFSS软件对其结构进行仿真与优化,设计工作频率为2.45 GHz的一分二Wilkinson型功分器。用网络分析仪对实物的测试表明,该功分器带宽大于25%,输出端口隔离度高,而且体积小、易于加工,可以满足微波热疗设备的要求。
In the clinical treatment of microwave hyperthermia, when the tumor volume is too large or deep, often require multiple radiators simultaneously irradiated tumor tissue. The power divider can divide the input microwave signal energy into multiple channels, and the energy can be equally divided or unequally distributed to the radiators so as to realize effective heating treatment on tumor tissues. In this paper, a two-point Wilkinson power splitter with microstrip structure with high isolation is developed. The three-step ladder impedance method is adopted. Through the impedance analysis of the equivalent circuit, the design parameters are given and the structure is simulated and optimized based on Ansoft HFSS software , Designed to operate at a 2.45 GHz split second Wilkinson power splitter. With the network analyzer on the physical test showed that the power divider bandwidth greater than 25%, high output port isolation, and small size, easy processing, microwave hyperthermia equipment to meet the requirements.