描述
6GK1105-2AB10
它們都是功率增益的單位，不同之處如下：
dBi和dBd是功率增益的單位，兩者都是相對值，但參考基準(zhǔn)不一樣。dBi的參考基準(zhǔn)為全方向性天線；dBd的參考基準(zhǔn)為偶極子。一般認(rèn)為dBi和dBd表示同一個增益，用dBi表示的值比用dBd表示的要大2.15dBi。例如：對于一增益為16dBd的天線，其增益折算成單位為dBi時，則為18.15dBi，一般忽略小數(shù)位，為18dBi。
dB也是功率增益的單位，表示一個相對值。當(dāng)計算A的功率相比于B大或小多少個dB時，可按公式10lgA/B計算。例如：A功率比B功率大一倍，那么10lgA/B=10lg2=3dB。也就是說，A的功率比B的功率大3dB；如果A的功率為46dBm，B的功率為40dBm，則可以說，A比B大6dB；如果A天線為12dBd，B天線為14dBd，可以說A比B小2dB。
dBm是一個表示功率絕對值的單位，計算公式為：10lg功率值/1mW。例如：如果發(fā)射功率為1mW，按dBm單位進(jìn)行折算后的值應(yīng)為：10lg1mW/1mW=0dBm；對于40W的功率,則10lg(40W/1mW)=46dBm。
dBc也是一個表示功率相對值的單位，與dB的計算方法完全一樣。一般來說，dBc相對于載波(Carrier)功率而言。在許多情況下，用來度量載波功率的相對值，如度量干擾（同頻干擾、互調(diào)干擾、交調(diào)干擾、帶外干擾等）以及耦合、雜散等的相對量值。在采用dBc的地方，原則上也可以使用dB替代。
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