小型化宽带磁场探头仿真与设计

提出了一种近场磁场探头,可用于集成电路电磁辐射发射测量,对电子设备中的辐射源定位。探头采用四层印刷电路板设计,介质材料采用高性能、低损耗的Rogers 4350B 材料,确保结构简单和小型化。多层板结构可以有效屏蔽外部空间中的电场耦合。通过使用过孔栅栏和同轴过孔结构实现良好的阻抗匹配,并且提高工作频率。同时,屏蔽过孔能够形成屏蔽腔,有效抑制谐振,提高电场抑制性能。采用HFSS 仿真软件得到磁场探头的性能参数,并进行实物加工。实验结果表明,探头工作频带可达到12 GHz,空间分辨率为2 mm,有良好的电场抑制度,仿真与实测结果吻合良好。

Simulation and Design of Miniaturized Broadband Magnetic Field Probe

This paper presents a near-field magnetic field probe, which can be used to measure the electromagnetic radiation emission of integrated circuits and locate the radiation source in electronic equipment. The probe is designed with four layers of printed circuit board, and the dielectric material is Rogers 4350B with high performance and low loss, which ensures simple structure and miniaturization. The multilayer structure can effectively shield the electric field coupling in the external space. Through the use of through-hole fence and coaxial through-hole structure to achieve good impedance matching and improve the working frequency. At the same time, the shielding via can form a shielding cavity, effectively suppress the resonance and improve the electric field suppression performance. HFSS simulation software is used to get the performance parameters of the magnetic field probe, and the physical processing is carried out. The experimental results show that the working frequency band of the probe can reach 12 GHz, the spatial resolution is 2 mm, and it has a good electric field suppression system. The simulation results are in good agreement with the measured results.