摘要
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 clinical application of microwave hyperthermia,multi-applicators are often simultaneously required to irradiate the tumor because of its large volume or its deep location.Power divider separates the input microwave energy into equal,or unequal,energy to each applicator.In this paper,the design procedure for the three-section transmission-line transformer based one-to-two equal-split Wilkinson power divider is introduced.By impedance analysis on equivalent scheme,the design parameter of power divider is provided,and by simulation and optimization on Ansoft HFSS,a microstrip structure Wilkinson power divider operating frequency 2.45GHz is given.Measurement test results from network analyzer show that it has 25% bandwidth and good isolation in output with this structure.Besides, it is characterized by small size and easy processing.This power divider suits microwave hyperthermia.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2010年第5期974-977,共4页
Journal of Biomedical Engineering
基金
国家自然科学基金面上项目资助(50977064)
江苏省高校自然科学基金资助项目(08KJB510019)
关键词
功率分配器
宽带
微波热疗
肿瘤
Power divider； Broadband； Microwave hyperthermia； Tumor；
