The frequency at which the voltmeter's response to an AC signal drops to 70% is often denoted as the "3db point" (f3dB).
电压表对交流信号的响应降低到70%时的频率常常称为“3d B点”(f3dB)。
Power amplifier Modules were designed using Push-Pull BJT power amplifiers that were combined using 3db Quadrature couplers.
功率放大器模组设计，使用负载牵引特性原理功率放大器被合并使用三分贝正交耦合器。
It is also found that the isolation structure with 3db is effective in 3d isolation, it can lower 50% response of earthquake than non-isolation structure.
研究结果表明，3db隔震结构的三向隔震效果明显，楼层的地震反应比不隔震结构降低了50%以上。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
This paper creatively put forward 3db design theory and analytical methods based on the intensive study of structural characteristics of 3db. Moreover, the 3db model is firstly designed and produced.
本文在充分研究了3db构造特点的基础上，创新性地提出了3db的设计理论和计算方法。
This paper creatively put forward 3db design theory and analytical methods based on the intensive study of structural characteristics of 3db. Moreover, the 3db model is firstly designed and produced.
本文在充分研究了3db构造特点的基础上，创新性地提出了3db的设计理论和计算方法。
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