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RF测试中的场强dBμV/m如何转换为功率EIRP的dBm

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发表于 2020-12-3 13:44:51 | 显示全部楼层 |阅读模式
The first assumption relates to the measurement environment, namely that it is occurring in free space. Reflections from nearby objects, or the attenuation of the signal by anything other than distance, are not accounted for. A good Fully Anechoic Room (FAR) gives this kind of environment, an Open Area Test Site (OATS) less so because of complications like ground-plane reflections. With this in mind, the basic situation is shown in Figure 1.

dBμV/m to EIRP dBm

dBμV/m to EIRP dBm

Figure 1. Basic relationship between radiated power and field strength Where P= power (W), E= electricfield strength (V/m) and Pd= power density (W/m2)

dBμV/m into Effective Isotropic Radiated Power (EIRP)
P(dBm) = E(dBμV/m) – 95.2

In summary, bearing in mind the assumptions being made, the Effective Isotropic Radiated Power can be derived from the 3 m field strength test measurements supplied with the CNE and CGE reference sources by subtracting 95.2 from the numerical value given in dBμV/m. By following the same process for the case of 10 m test measurements, 84.8 should be subtracted instead.

dBμV/m to EIRP dBm
how_to_-_eirp.pdf (532.7 KB, 下载次数: 0)
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 楼主| 发表于 2020-12-3 17:29:49 | 显示全部楼层
场强换算为功率值,对于无线RF产品测试欧洲杂散测试,对比之前的替代法,要先进多了!!!主要是快速,不用替代法那样繁琐,还容易出错。不确定度太大了……

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发表于 2020-12-10 11:23:41 | 显示全部楼层
好文章,必须顶~~~~
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