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6GK1105-2AD10

它们都是功率增益的单位，不同之处如下：
dBi和dBd是功率增益的单位，两者都是相对值，但参考基准不一样。dBi的参考基准为全方向性天线；dBd的参考基准为偶极子。一般认为dBi和dBd表示同一个增益，用dBi表示的值比用dBd表示的要大2.15dBi。例如：对于一增益为16dBd的天线，其增益折算成单位为dBi时，则为18.15dBi，一般忽略小数位，为18dBi。
dB也是功率增益的单位，表示一个相对值。当计算A的功率相比于B大或小多少个dB时，可按公式10lgA/B计算。例如：A功率比B功率大一倍，那么10lgA/B=10lg2=3dB。也就是说，A的功率比B的功率大3dB；如果A的功率为46dBm，B的功率为40dBm，则可以说，A比B大6dB；如果A天线为12dBd，B天线为14dBd，可以说A比B小2dB。
dBm是一个表示功率绝对值的单位，计算公式为：10lg功率值/1mW。例如：如果发射功率为1mW，按dBm单位进行折算后的值应为：10lg1mW/1mW=0dBm；对于40W的功率,则10lg(40W/1mW)=46dBm。
dBc也是一个表示功率相对值的单位，与dB的计算方法完全一样。一般来说，dBc相对于载波(Carrier)功率而言。在许多情况下，用来度量载波功率的相对值，如度量干扰（同频干扰、互调干扰、交调干扰、带外干扰等）以及耦合、杂散等的相对量值。在采用dBc的地方，原则上也可以使用dB替代。

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6GK1105-2AD10

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