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Beginner

Difference Between Gain of Different Frequencies with Integrated Omnidirectional Antennas

Here is a quote from some ENCOR material:

 

Integrated omnidirectional antennas typically have a gain of 2 dBi in the 2.4 GHz
band and 5 dBi in the 5 GHz band.

 

Why is it that the lower frequency has less gain than the higher frequency?

 

Any input is appreciated.

4 REPLIES 4
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VIP Expert

Re: Difference Between Gain of Different Frequencies with Integrated Omnidirectional Antennas

Might have to due with signal absorption and/or signal reflection from other items in the environment.
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Beginner

Re: Difference Between Gain of Different Frequencies with Integrated Omnidirectional Antennas

I do not think so. This is just the baseline gain from the antenna radiation.
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VIP Expert

Re: Difference Between Gain of Different Frequencies with Integrated Omnidirectional Antennas

Well that's possible too assuming the antenna is more suitable for 5 GHz vs. for 2.4 GHz (recall any antenna is only really optimal for one wavelength/frequency [https://en.wikipedia.org/wiki/Standing_wave_ratio]).
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Hall of Fame Community Legend

Re: Difference Between Gain of Different Frequencies with Integrated Omnidirectional Antennas

When the power gain are set equally, 2.4 Ghz can push further than 5.0 Ghz.
NOTE: I am talking about when the setup is in a wide open field and the nearest WiFi interference is 100 metres away.
The probably reason why the antennas power gain is/was designed like that is to ensure that at a certain distance, the RSSI of the 2.4 Ghz and 5.0 Ghz are equal.