目的:设计一种工作在2.45 GHz频率的新型喇叭天线辐射器.方法:基于喇叭天线理论,设计辐射器参数,运用高频结构仿真器仿真软件建立圆锥喇叭天线模型,模拟计算人体头部组织的电磁场分布及单位质量电磁能量吸收率.结果:设计的喇叭天线辐射器在中心频率2.45 GHz下,天线输入端电压驻波比基本小于1.5,回波损耗小于-13 dB,人体头部组织在电磁辐射下的比吸收率最大限值为1.7 W/kg,满足设计的技术指标.结论:该辐射器有较好的方向特性,输出的微波能量满足体外理疗的要求.%Objective To design a new horn antenna radiator which works at 2.45 GHz for microwave hyperthermia. Methods Based on the theory of horn antenna, the parameters of radiator were determined. High frequency structure simulator (HFSS) was used to establish the cone horn antenna model, and analyze the distributions of electromagnetic fields and the specific absorption rate of human head tissues. Results In the central frequency of 2.45 GHz, the antenna input voltage standing-wave ratio was less than 1.5;the return loss was lower than-13 dB;and the maximum specific absorption rate of human head tissues under electromagnetic radiation was 1.7 W/kg, which met the technical indexes. Conclusion The radiator has a good antenna pattern, and the output microwave energy meets the requirements of physical therapy.
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