Non-Reciprocal Phased Array antenna

A nonreciprocal phased array antenna is proposed in this paper. compare to a conventional phased array antenna, here the proposed structure has two independent paths for transmit and receive state which makes the antenna a perfect candidate for full-duplex application. The two paths have achieved by a Wilkinson power divider in which it divides the signal on one side and combine it on the other side. Each path consists of a unilateral amplifier as well as a phase shifter. Two types of phase shifter were utilized to generate both positive and negative phases. The phase shifters were designed based on a T-type filters and by using varactor diodes in which it can be reconfigurable by different bias voltages. A
$1\times 4$
feed network based on the proposed non-reciprocal idea were implemented and measured. The measured scattering parameters shows a better than −15 dB return loss and validate our claim on the non-reciprocity response of the proposed feed network by measuring the phase responses. A
$2\times 4$
patch antenna also integrated into the proposed feed network and implemented. The proposed phased array antenna provides power amplification as well as the ability to steer the transmit and receive signal independently.