TY - JOUR
T1 - A Wide-Angle-Scanning Large-Spacing Phased Array With Multipolarization and Grating-Lobe Suppression
AU - Zhen, Pengfei
AU - Liu, Yong
AU - Lu, Hongda
AU - Gao, Steven
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2026/1
Y1 - 2026/1
N2 - In this article, an X-band wide-angle-scanning large-spacing phased array with grating-lobe suppression based on low-profile quad-polarization null reconfigurable (QPNR) elements is proposed. The key novel contributions are as follows. First, the QPNR element composed of four dipoles, a dual-polarization (DP) microstrip patch, and a quasi-monopole can provide four radiation channels to achieve DP beams in zenith and horizontal regions independently. Second, by adjusting the amplitude weight ratio and phase difference of the four independent channels, the null synthesis of linear polarizations (LPs) and circular polarizations (CPs) can be realized at different angles, supporting the grating-lobe suppression in phased array design. Third, a typical QPNR-element-based 1 × 8 linear phased array with an element spacing of 0.85λ0 is designed, fabricated, and experimentally verified within the band of 8.3–8.7 GHz. The results show a beam scanning range of ±75° without grating lobe under both dual-LP and dual-CP operating modes. The grating-lobe levels are reduced by more than 9.7 dB compared with that of the array only using DP microstrip patch elements. The gain drop at the maximum scanning angle is less than 4.2 dB. The good performance of multipolarization wide-angle scanning and grating-lobe suppression makes this array a potential option in radar and communication applications.
AB - In this article, an X-band wide-angle-scanning large-spacing phased array with grating-lobe suppression based on low-profile quad-polarization null reconfigurable (QPNR) elements is proposed. The key novel contributions are as follows. First, the QPNR element composed of four dipoles, a dual-polarization (DP) microstrip patch, and a quasi-monopole can provide four radiation channels to achieve DP beams in zenith and horizontal regions independently. Second, by adjusting the amplitude weight ratio and phase difference of the four independent channels, the null synthesis of linear polarizations (LPs) and circular polarizations (CPs) can be realized at different angles, supporting the grating-lobe suppression in phased array design. Third, a typical QPNR-element-based 1 × 8 linear phased array with an element spacing of 0.85λ0 is designed, fabricated, and experimentally verified within the band of 8.3–8.7 GHz. The results show a beam scanning range of ±75° without grating lobe under both dual-LP and dual-CP operating modes. The grating-lobe levels are reduced by more than 9.7 dB compared with that of the array only using DP microstrip patch elements. The gain drop at the maximum scanning angle is less than 4.2 dB. The good performance of multipolarization wide-angle scanning and grating-lobe suppression makes this array a potential option in radar and communication applications.
KW - Grating-lobe suppression
KW - large-spacing
KW - null reconfigurable
KW - phased array
KW - quad-polarization (QP)
KW - wide-angle scanning
UR - https://www.scopus.com/pages/publications/105019778172
U2 - 10.1109/TAP.2025.3622418
DO - 10.1109/TAP.2025.3622418
M3 - Article
AN - SCOPUS:105019778172
SN - 0018-926X
VL - 74
SP - 151
EP - 161
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 1
ER -