How we combine a Wi-Fi signal with a different range of 4.9 Ghz to 6.4 Ghz?

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Prashantkumar

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Hi Everyone,

Greetings of the day !!!

We want to combine two Wi-Fi signals with a Frequency range of 4.9 Ghz to 6.4 Ghz on both input ports. We are looking for a suggestion to combine these two Wi-Fi signals so that we can minimize the losses.

We tried to use a power combiner but observed that if both the transmit frequency signals are different then we are getting a -3~4 dB power combiner loss.

Can we use a 3dB coupler to minimize the loss and combine both chains into a single Antenna port?

Looking for your valuable suggestions!

Regards
Prashant kumar
 

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Using a 3dB coupler might not be the ideal solution for combining signals with different frequencies. Couplers are generally designed for splitting rather than combining signals.
 

Even if you use a 3dB coupler, the signal which will pass through will be attenuated some and the other one will also be attenuated 3dB+.
So, you will loose in either case.
Additional to this, the frequency band is large and there will absolutely be ripples/flatness in coupler frequency response and therefore the result might be worse than expected. Also, isolation problem will arise due to limited coupling range and this will impose an impact over a signal by the other.
The best option is to use a well and carefully designed/obtained Combiner/Divider. This will bring at least 15-20 dB isolation.
 

Only coherent signals (same frequency and phase) can be combined without losses. Two WiFi signals with different modulation (carrying different data) are incoherent, even if they use same carrier frequency.

It's not clear what you want to achieve, operating two WiFi access points over one antenna? If so, it's essentially a bidirectional problem, combining TX and splitting RX signal. Both operations involve principially 3 dB losses.
 

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