TY - JOUR A2 - Ferrando Bataller, Miguel AU - Liu, Shuangbing AU - Yang, Lixia AU - Chen, Qian AU - Wu, Xianliang PY - 2022 DA - 2022/08/10 TI - A Low-Profile Broadband Circularly Polarized Metasurface Antenna Aperture Coupled by Shorted Annular-Ring Slot SP - 8517646 VL - 2022 AB - A low-profile (LP) metasurface antenna is proposed for broadband circularly polarized (CP) operations. The metasurface radiator, formed by a 5 × 5 array of square patches, has a microstrip line fed at its bottom through a shorted annular-ring slot centered on the ground plane. First, the characteristic mode analysis (CMA) methodology is employed to examine the intrinsic modes of the metasurface. Subsequently, a pair of mutually orthogonal modes is selected and excited by the feeding structure with a 90° phase difference to produce CP radiation. For the purpose of verification, a prototype antenna is developed, and the obtained data reveal that the antenna exhibits an impedance bandwidth of 43.9% ranging from 4.8 to 7.5 GHz (S11<−10 dB). The 3-dB axial ratio bandwidth is 22.2% in the range of 5.6–7 GHz, among which a satisfactory left-handed CP radiation is achieved, and the maximum gain in the broadside direction reaches 9.3 dBic at 6.9 GHz. SN - 1687-5869 UR - https://doi.org/10.1155/2022/8517646 DO - 10.1155/2022/8517646 JF - International Journal of Antennas and Propagation PB - Hindawi KW - ER -