A 4×4 Planar Dual-Polarization Retrodirective Array

The passive Retrodirective Array (RDA) can increase the RCS of the antenna array in a wide-angle range without excitation. In this work, we design a Planar Dual-polarization Retrodirective Array which has the polarization rotation function. Because more transmission lines are needed, the complexity of the RDA with polarization rotation function is twice that of the ordinary RDA. By designing the phase conjugation network with a multi-layer structure, we place 16 transmission lines of equal length in a small antenna aperture. The simulation results show that the RDA’s 3dB beamwidth of the Monostatic RCS is about ±40° which has a great improvement in the wide-angle range compared with the metal plane of the same size.