TY - JOUR
T1 - Decoupling for Millimeter-Wave Array Antennas Using Near-Field Shrinking Dielectric Superstrate
AU - Luo, Shengyuan
AU - Zhang, Yiming
AU - Mei, Peng
AU - Pedersen, Gert Frølund
AU - Zhang, Shuai
PY - 2023
Y1 - 2023
N2 - A decoupling concept of near-field shrinking dielectric superstrate (NFSDS) is proposed for large-scale, wideband, and dual-polarized mm-wave arrays. An NFSDS with a thickness of 4 mm (0.32 λ0 at 24 GHz) is mounted seamlessly above the array, which shrinks the near field of the array elements to reduce the space wave coupling while slightly increasing the surface wave coupling of the arrays. By loading a superstrate with a certain thickness and low permittivity, the total coupling of the mm-wave arrays is reduced significantly. Periodic air holes are drilled through the superstrate to lower the NFSDS permittivity. An 8 × 8 mm-wave array is simulated, fabricated, and measured to verify the proposed decoupling concept. The simulated and measured coupling of the mm-wave array is reduced from -17 dB to lower than -23.2 dB from 24 – 29.5 GHz and lower than -25 dB in most of the band, respectively. The radiation patterns of the array before and after decoupling almost keep unchanged. Moreover, the NFSDS can efficiently improve the array beam scanning capability. The measured results align well with the simulated.
AB - A decoupling concept of near-field shrinking dielectric superstrate (NFSDS) is proposed for large-scale, wideband, and dual-polarized mm-wave arrays. An NFSDS with a thickness of 4 mm (0.32 λ0 at 24 GHz) is mounted seamlessly above the array, which shrinks the near field of the array elements to reduce the space wave coupling while slightly increasing the surface wave coupling of the arrays. By loading a superstrate with a certain thickness and low permittivity, the total coupling of the mm-wave arrays is reduced significantly. Periodic air holes are drilled through the superstrate to lower the NFSDS permittivity. An 8 × 8 mm-wave array is simulated, fabricated, and measured to verify the proposed decoupling concept. The simulated and measured coupling of the mm-wave array is reduced from -17 dB to lower than -23.2 dB from 24 – 29.5 GHz and lower than -25 dB in most of the band, respectively. The radiation patterns of the array before and after decoupling almost keep unchanged. Moreover, the NFSDS can efficiently improve the array beam scanning capability. The measured results align well with the simulated.
KW - Mutual decoupling
KW - NFSDS
KW - large-scale
KW - mm-wave antenna array
KW - space wave coupling
KW - surface wave coupling
UR - http://www.scopus.com/inward/record.url?scp=85180286087&partnerID=8YFLogxK
U2 - 10.1109/OJAP.2023.3328813
DO - 10.1109/OJAP.2023.3328813
M3 - Journal article
SN - 2637-6431
VL - 4
SP - 1187
EP - 1194
JO - IEEE Open Journal of Antennas and Propagation
JF - IEEE Open Journal of Antennas and Propagation
ER -