面向ONT的金属散热器电磁辐射仿真方法  

A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT

作　　者：田传寅 张毅[2] TIAN Chuanyin;ZHANG Yi(Wuhan Research Institute of Posts and Telecommunications,Wuhan 430074,China;Broadband Service Application Business Unit,FiberHome Telecommunication Technologies Co.,Ltd.,Wuhan 430205,China)

机构地区：[1]武汉邮电科学研究院,武汉430074 [2]烽火通信科技股份有限公司宽带业务产出线,武汉430205

出　　处：《光通信研究》2025年第1期40-44,共5页Study on Optical Communications

摘　　要：【目的】光网络终端(ONT)中的金属散热器会耦合来自高速微带线的电磁干扰,并向空间辐射电磁波。金属散热器的电磁辐射可能会对接收机的无线性能产生严重影响。因此在ONT产品的设计阶段需要对金属散热器的电磁辐射进行准确地仿真和评估。【方法】文章提出了一种基于场路协同的金属散热器电磁辐射仿真方法,可以实现对金属散热器的谐振频率和电磁辐射强度的全面评估。通过电路仿真与电磁场仿真的协同工作,该方法将微带线上的高速时域信号作为模型的激励源,使仿真模型更接近实际情况。文章通过实验验证了所提方法仿真结果的合理性与准确性。【结果】研究结果表明,与常见的仿真方法相比,文章所提仿真方法得到的散热器电磁辐射功率大约为-70 dBm,更符合实际水平;金属散热器的尺寸与其谐振频率呈负相关关系;改变金属散热器的尺寸,仿真中散热器的电磁辐射强度与实测总各向同性灵敏度(TIS)指标的变化趋势一致且相关系数在0.94以上。【结论】文章所提方法对金属散热器电磁辐射的仿真结果比较准确。在ONT产品的设计阶段,此方法可用于预估金属散热器的电磁辐射对无线TIS指标的影响,便于采取针对性措施对金属散热器的电磁辐射进行抑制,从而减少样机阶段的调试时间,提高研发效率。【Objective】The metal heatsink in the Optical Network Terminal(ONT)can couple the electromagnetic interference from high-speed microstrip lines and radiate electromagnetic waves into space.The electromagnetic radiation from the metal heatsink may have a serious impact on the wireless performance of the receiver.Therefore,in the design stage of ONT products,it is necessary to accurately simulate and evaluate the electromagnetic radiation of metal heatsinks.【Methods】This paper proposes a simulation method for electromagnetic radiation of metal heatsinks based on field-circuit co-simulation,which can comprehensively evaluate the resonance frequency and electromagnetic radiation intensity of the metal heatsink.Through the collaborative work of circuit simulation and electromagnetic field simulation,this method uses high-speed time-domain signals on microstrip lines as the excitation source of the model,making the simulation model closer to the actual situation.This paper verifies the rationality and accuracy of the simulation results obtained by this method through experiments.【Results】The research results indicate that:Compared with the common simulation method,the electromagnetic radiation intensity of the heatsink obtained by this simulation method is in the order of-70 dBm,which is more in line with the actual level;The size of the metal heatsink is negatively correlated with its resonant frequency;By changing the size of the metal heatsink,the electromagnetic radiation intensity of the heatsink in the simulation is consistent with the measured Total Isotropic Sensitivity(TIS)metrics in the variation trend,and the correlation coefficient is above 0.94.【Conclusion】The proposed method is relatively accurate in simulating the electromagnetic radiation of metal heatsinks.During the design stage of ONT products,this method can be used to estimate the impact of electromagnetic radiation from metal heatsinks on wireless TIS indicators.This allows for targeted measures to be taken to suppress the electroma

关 键 词：金属散热器 电磁辐射 场路协同仿真 光网络终端 

分 类 号：TN03[电子电信—物理电子学]