A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT

TIAN Chuanyin; ZHANG Yi

doi:10.13756/j.gtxyj.2025.230149

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A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT

更新时间：2025-02-17

- A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT
- Study on Optical Communications Issue 1, (2025)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.230149
  CLC： TN03
- Published：10 February 2025，
  
  Received：07 October 2023，
  
  Revised：01 November 2023，
- 稿件说明：
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田传寅，张毅. 面向ONT的金属散热器电磁辐射仿真方法[J]. 光通信研究，2025(1): 230149.

Tian C Y, Zhang Y. A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT[J]. Study on Optical Communications，2025(1): 230149.
田传寅，张毅. 面向ONT的金属散热器电磁辐射仿真方法[J]. 光通信研究，2025(1): 230149. DOI： 10.13756/j.gtxyj.2025.230149.

Tian C Y, Zhang Y. A Simulation Method for Electromagnetic Radiation of Metal Heatsinks for ONT[J]. Study on Optical Communications，2025(1): 230149. DOI： 10.13756/j.gtxyj.2025.230149.

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。

Abstract

【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 electromagnetic radiation from metal heatsinks，thereby reducing debugging time during the prototype stage and improving research and development efficiency.

关键词

Keywords

references

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