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The reflection coefficient is the square root of the reflected-to-forward power ratio, and VSWR is (1+rho)/(1-rho). A 2:1 SWR means rho = 0.333, so 11% of the power is reflected and only 0.5 dB is actually lost — much less alarming than the SWR figure suggests.
VSWR
rho = sqrt(Prefl / Pfwd); VSWR = (1 + rho)/(1 - rho); mismatch loss = -10 log10(1 - rho^2)
Not for power transfer — only 0.5 dB is lost. It matters because many transmitters fold back power or stress their output stage above about 1.5-2:1.
No. A resistor gives a perfect SWR and radiates nothing. SWR only tells you about the match, not the radiation efficiency.