TY - JOUR
T1 - Characteristic Mode Inspired Broadband Circularly Polarized Folded Transmitarray Antenna
AU - Wang, Jingwen
AU - Zhang, Xiang
AU - Ding, Jun
AU - Zhang, Hualiang
AU - Chen, Weidong
AU - Chen, Chang
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - The circularly polarized (CP) antennas with high gains have gained growing interest due to their significant advantages, but the existing works usually suffer from narrow bandwidths. In this work, a novel circularly polarized folded transmitarray antenna (CPFTA) inspired by the characteristic mode analysis (CMA) method is proposed to achieve a broadband and high-gain CP radiation. The proposed CPFTA consists of a top-layer multifunctional metasurface (MTS), and a bottom-layer polarization conversion metasurface (PCM) integrated with a linearly polarized (LP) microstrip feed source. Enabled by the CMA, the unit cell etched with an asymmetric U-slot of the MTS is optimized to generate two pairs of CP modes to broaden the bandwidth of the CPFTA. Moreover, a modified broadband E-shaped LP microstrip antenna is integrated with the PCM, resulting in a compact profile. A CPFTA prototype is fabricated and characterized to verify the effectiveness of the design. The measured results show that the fabricated antenna could obtain an impedance bandwidth of 31.7%, a 3-dB axial ratio (AR) bandwidth of 36.5%, and a 3-dB gain bandwidth of 30.1% with a peak gain of 22.35 dBic at 9.55 GHz.
AB - The circularly polarized (CP) antennas with high gains have gained growing interest due to their significant advantages, but the existing works usually suffer from narrow bandwidths. In this work, a novel circularly polarized folded transmitarray antenna (CPFTA) inspired by the characteristic mode analysis (CMA) method is proposed to achieve a broadband and high-gain CP radiation. The proposed CPFTA consists of a top-layer multifunctional metasurface (MTS), and a bottom-layer polarization conversion metasurface (PCM) integrated with a linearly polarized (LP) microstrip feed source. Enabled by the CMA, the unit cell etched with an asymmetric U-slot of the MTS is optimized to generate two pairs of CP modes to broaden the bandwidth of the CPFTA. Moreover, a modified broadband E-shaped LP microstrip antenna is integrated with the PCM, resulting in a compact profile. A CPFTA prototype is fabricated and characterized to verify the effectiveness of the design. The measured results show that the fabricated antenna could obtain an impedance bandwidth of 31.7%, a 3-dB axial ratio (AR) bandwidth of 36.5%, and a 3-dB gain bandwidth of 30.1% with a peak gain of 22.35 dBic at 9.55 GHz.
KW - Broadband
KW - characteristic mode analysis
KW - circularly polarized folded transmitarray antenna
KW - metasurface
UR - https://www.scopus.com/pages/publications/85162728366
U2 - 10.1109/TAP.2023.3284360
DO - 10.1109/TAP.2023.3284360
M3 - 文章
AN - SCOPUS:85162728366
SN - 0018-926X
VL - 71
SP - 7632
EP - 7637
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 9
ER -