Patent ID: 8005513

Claim:
A cellular telephone signal booster system comprising: a first antenna that receives remote incoming cellular signals at a first frequency from a remote cellular site and that transmits remote outgoing cellular signals to the remote cellular site at a second frequency; a second antenna that transmits local outgoing cellular signals responsive to the remote incoming cellular signals to a local cellular telephone at the first frequency and that receives local incoming cellular signals from the local cellular telephone at the second frequency; a first RF amplifier that is responsive to the remote incoming cellular signals from the first antenna at the first frequency to provide the local outgoing cellular signals at the first frequency to the second antenna; a second RF amplifier that is responsive to the local incoming cellular signals from the second antenna at the second frequency to provide the remote outgoing cellular signals at the second frequency to the first antenna; a first active stability network operating at the first frequency that decreases the amount of radiated or conducted parasitic cellular signal between the first and the second antenna by combining a first stabilization signal that at least partially compensates for the parasitic cellular signal with a first RF input signal at the first frequency, the first network coupled from the output of the first amplifier back to the input of the first amplifier; a second active stability network operating at the second frequency that decreases the amount of radiated or conducted parasitic cellular signal between the first and the second antenna by combining a second stabilization signal that at least partially compensates for the parasitic cellular signal with a second RF input signal at the second frequency, the second network coupled from the output of the second amplifier back to the input of the second amplifier; and an RF circuit board comprising a ground plane interposed between the first and the second antenna at controlled distances and reflecting RF power from the antennas, and the RF circuit board further comprising a common microcontroller adjusting both the first and the second stabilization signals.