A phase conjugating array for spectrally efficient wireless signal retransmission

In this paper, a compact retrodirective array architecture is proposed, capable of responding with a spectrally efficient communication format to an arriving CW interrogation. Taking advantage of a PHEMT transconductance characteristic, an IQ modulation of the incoming signal is here implemented by active gate mixing. With the introduction of digital predistorting functions, a good linearity is assured in the phase conjugated wireless signal restransmission.