and so for an ideal antenna gain & directivity correspond exactly.
é = Prad /边 , 此理想天线增益和方性完全一致。
and so for an ideal antenna gain & directivity correspond exactly.
é = Prad /边 , 此理想天线增益和方性完全一致。
Laser is a new light source.Comparing with ordinary light the laser has good monochromaticity, directivity, coherency, high brightness, high power and high energy etc.
摘要是一种新型源,普通相比,具有很好单色性、方性、相干性和高亮度以及高功率、高能量等特点。
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