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tacos123
Antenna-Theory.com Newbie
Joined: 21 Feb 2015
Posts: 1
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 Posted: Sat Feb 21, 2015 1:45 pm Post subject: 0db vs 1db vs 3db for antenna diversity |
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if you have a receive diversity setup with 2 antennas, and the first can receive a signal to -100dbm and the second antenna (diversity) can read a signal also to -100dbm, then the combined receive would be -103dbm.
but what if the first antenna can receive -100dbm and the second antenna can receive -103dbm, now this is a problem, both antennas should be within 1db of each other? why is 3db delta bad? |
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admin
Site Admin
Joined: 03 Jan 2007
Posts: 247
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| Posted: Sat Feb 21, 2015 7:25 pm Post subject: |
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The combined sensitivity drops by 3 dB only if the signals are coherently combined, by the way.
There is no requirement that sensitivities need to be within 1 dB of each other. The lesser antenna just get less effective the farther the delta gets |
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