Simulation of concrete wall penetration by microwaves, right, shows signal reduction of about 20 dB. The near-field coupled RF is confined, therefore providing privacy.
Microwatt signal levels are sufficient for low BERs.
With this capability, the Wall Coupler can be used also as a relay in wireless networks, as WiFi and WiMax, to overcome signal attenuation by walls and ceilings, see publication by G. Knapp, referenced below.
We have been producing prototypes in limited quantities for our own use.
Presently, we are interested in licensing this patented technology and invite interested parties to write us.