Patent ID: 6512428
Filing Date: 2003-01-28
Classification: H04B

Abstract:
A device for the simultaneous reception/transmission of signals in a transmission system with a transmitter and a receiver, the device comprising a reception path for receiving a reception signal occupying a reception frequency band and a transmission path for transmitting a transmission signal occupying a transmission frequency band, the said reception and transmission bands being disjoint, the reception path comprising a low-noise amplification stage comprising means for amplifying the reception signal, the operating characteristic of these means being linear for an amplitude range of the input signal and exhibiting saturation onwards of an amplitude of a given input signal, wherein:an optimal load impedance is defined for linear behaviour of the amplification means, impedance adaptation means are arranged at the output of these amplification means for referring back to this output on the one hand an open circuit in the reception frequency band and on the other hand an impedance equal to the optimal load impedance in the transmission frequency band.