HDMI电缆对受试设备辐射骚扰场强的影响

The Effect of HDMI Cable on Radiation Disturbance Field Intensity of Tested Equipment

通过理论分析、电磁仿真、验证试验等方式,分析HDMI线缆长度、线缆端接负载情况、线缆间相对位置对产品辐射发射水平的影响;从共模电流抑制的角度,给出HDMI电缆屏蔽层接地方式及共模扼流圈的选择对共模辐射发射的影响。结果表明,在较高频率改变线缆长度对电场辐射影响较小;将HDMI线缆和其他线缆分开走线并连接正常工作的显示设备,可得到产品最大电场辐射。

In this paper,the influence of performance of HDMI cable to radiation emission level of electronic products is analyzed;the impact of cable length and relative position between cables to common-mode radiation emission is calculated;the grounding mode of cable shielding layer and selection of common-mode choke is introduced.The results show that changing the length of cable at high frequency has little effect on electric field radiation,and the maximum electric field radiation can be obtained by separating HDMI cable from other cables and connecting the normal working display device.