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nRF24l01+ Through Concrete

We have developed and certified a module which uses the nRF24l01+. We spent a good amount of time tuning the antenna circuitry which has resulted in very good range... in open space. The primary transmitter is located in a plastic enclosure and uses a ceramic chip antenna. The primary receiver is located in a metal enclosure (yeah I know metal is not good etc...but we still measured good field strength) with a sizable plexiglass window. The primary receiver uses a 1/4 wave external antenna with 2.1 dBi of gain. For the majority of the installations everything is running extremely well however more and more units are being installed on opposite sides of thick concrete walls. Any ideas about increasing the penetration through these concrete walls, without too much modification of the antenna circuitry.

Just to get it out there, we have also setup a primary receiver outside of the metal enclosure so that only the concrete wall was the loss path. This did help but it did not fix the issue.

Thanks

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