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...
所以VSWR范围=1～∞,VSWR此值越大,说明接头处连接不好。 驻波一般 小于1.5,就馈线而言,驻波一般小于1.5,也有考虑工程余量,为1.3以下,GPS馈线要求VSWR 小于2.5 回波损耗=-20*LOG10((VSWR-1)/(VSWR+1))
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。
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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VSWR table of return loss vs. voltage standing wave ratio RETURN LOSS VSWR (dB) 46.064 40.086 36.607 34.151 32.256 30.714 29.417 28.299 27.318 26.444 25.658 24.943 24.289 23.686 23.127 22.607 22.120 21.664 21.234 20.828 20.443 20.079 19.732 19.401 19.085 18.783 18.493 18.216 17.949 17.690 17.445 ...
Return Loss in dB What It Means VSWR Number 0 dB 100% reflection, no power into the antenna, all reflected back Infinite 1 dB 80% reflection, 20% power into the antenna 17 2 dB 63% reflection, 37% power into the antenna 9 3 dB ...
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；
The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of the listed input types. VSWR (voltage standing wave ratio, sometimes pronounced "viswar"), is the ratio of the max
ReturnLoss,ReflectionCoefficientandVSWRHereisabriefreviewofthreerelatedRFtrans-missionparameters,alongwithareferencetableoftheirvalues.Athighfrequencies,theactualvoltages,currentsandphaserelationshipsthatdefineanimpedancearedifficulttomeasuredirectly.Instead,weusesteady-statemeasurementsofthetravelingwavesintrans-missionlines...