Broadband Low Sidelobe T/R Array With Mutual Coupling Reduction Based On Metasurface

A design of transmit-receive (T/R) array with low sidelobe, wide beam and high isolation is presented in this paper. Planar microstrip quasi- Y agi antenna is employed as the antenna unit, which has the properties of broadband and wide beam-width. To obtain high-gain and low-sidelobe performance, a 1 x4 antenna array with taper excitation by unequal power divider is carried out. Meanwhile, by employing the folded T -shaped metasurface, the mutual coupling between the transmit array and receive array is significantly reduced. Simulated results show that the 3-dB beam width of the T/R array is 124°, the side lobe level is lower than -18 dB, and the isolation is approximately 40 dB at 1.5GHz.