Telecom BSS Operations and Maintenance Lecture #11.

VSWR is voltage stand wave ratio its threshold must be -1.30 as per standard.
VSWR is a measure how much antenna is radiated the power and how much its reflect back into the source.
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
50% reflection, 50% power into the antenna
6
5 dB
32% reflection, 68% power into the antenna
3.5
6 dB
25% reflection, 75% power into the antenna
3
8 dB
16% reflection, 84% power into the antenna
2.3
10 dB
10 dB (10% reflection, 90% power into the antenna)
2
15 dB
15 dB (3% reflection, 97% power into the antenna)
1.4
20 dB
20 dB (1% reflection, 99% power into the antenna)
1.2

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