驻波比小于3,就是要求你的反射系数要小于1/2，也就是说你的功率损耗不能超过入射功率的25%，也就是说你的return loss要大于6db，return loss越大，你的信号反射的越少的，当然效率越高啦！好像工业上要求一般驻波比小于2的。
如果SWR 值大于1, 则表示有一部分电波被反射回来,最终变成热量,使得馈线升温。 两者之间的关系:RL=20*log10[(VSWR+1)/(VSWR-1)] 驻波比 回波损耗(dB) 驻波比 回波损耗(dB) 1.01 46.064 1.26 18.783 1.02 40.086 1.27 18.493 1.03 36.607 1.28 18.216 1.04 34.151 1.29 17.949 1.05 32.256 1.30 17.6...
Return loss (RL) and Voltage Standing Wave Ratio (VSWR) are both measurements used to quantify efficiency of power transfer in radio frequency (RF) and Microwave systems. They are related but represent same information in different ways. Return Loss in dB: It is a measure of reflected power ...
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It is often necessary to convert between VSWR and return loss - this can be done using simple formulas or a table provided here.
Here is a JavaScript calculator forVSWR / Return Loss / Reflection Coefficient / Mismatch Error / Improvement Complex Impedances: Return LossVoltage Standing Wave RatioReflection Coefficient Note: VSWR values were used to calculate the other two related values (rounded to 3 significant places) ...
It varies from +1 to infinite. 以下摘自:http://www.mscbsc.com/askpro/question87979 回波损耗RL 它是反射系数的倒数,以分贝表示。 RL的值在0dB到无穷大之间,回波损耗越小表示匹配越差,反之则匹配越好。 0dB表示全反射,无穷大表示完全匹配。 在移动通信中,一般要求回波损耗大于14dB(对应VSWR=1.5)。
LossLossReflTransRefl VSWR(dB)(dB)Coeff(%)(%) 1.00—.000.00100.0.0 1.0146.1.000.00100.0.0 1.0240.1.000.01100.0.0 1.0336.6.001.01100.0.0 1.0434.2.002.02100.0.0 1.0532.3.003.0299.9.1 1.0630.7.004.0399.9.1 1.0729.4.005.0399.9.1 1.0828.3.006.0499.9.1 ...
S11：端口2匹配时，端口1的反射系数；S22：端口1匹配时，端口2的反射系数；S12：端口1匹配时，端口2到端口1的反向传输系数；S21：端口2匹配时，端口1到端口2的正向传输系数；