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The bandwidth of an antenna is defined as the range of frequency over which the VSWR is "still acceptable". Generally values of VSWR=1.5 or even VSWR=2.0 are used. The return loss (that reported in your picture) is given by:
RL=20*Log[VSWR/(VSWR-1)] that means:
VSWR=1.5 ==> RL = -6dB
VSWR=2.0 ==> RL = -10dB
In the first case the range of frequency is 4.8-7.4 GHz ==> BW=2.6 GHz
In the second case the range of frequency is 5.2-7.1 GHz ==> BW=1.9 GHz
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