Broadband Dual-Polarized Differential-fed Filtering Antenna Array for 5G Millimeter-Wave Applications
Artikel i vetenskaplig tidskrift, 2022

This manuscript presents a novel broadband dual-polarized filtering patch antenna array using low-temperature co-fired ceramic (LTCC) process for 5G millimeter-wave applications. The filtering antenna element is implemented by using a ±45° polarized patch antenna fed by two pairs of differential L-type probes. An additional square ring and open strips are connected to each probe, resulting in radiation nulls and realizing the lower/upper stopband rejection level over 24 dB with skirt selectivity. The cross coupling among these structures not only introduces filtering responses, but also contributes to broadening the passband of 24.25-29.5 GHz covering 5G n257/n258/n261 bands. The antenna performance is validated by equivalent circuits based on transmission line models, which reveals clearly the principles of filtering antenna step by step and provides guidelines for further designs. The proposed filtering antenna element is expanded to a 4×4 filtering antenna array with shunt fed feeding networks. The spacing between elements is 0.48 λ0. The measured results demonstrate that the array performs good filtering characters including high stopband rejection, high selectivity, and wide upper stopband up to 40 GHz, where the antenna efficiency (considering radiations from all the directions) is less than 5%. In addition, the differential feeds provide symmetric radiation patterns with low cross-polarized counterparts. Compared with other reported works, the proposed filtering antenna/ array has excellent performances of wideband, high stopband rejection and wide upper stopband for potential 5G millimeter-wave applications.

millimeter-wave (mmW) antenna

low-temperature cofired ceramic (LTCC)


filtering antenna

Antenna arrays

Antenna feeds

radiation null

out-of-band suppression level

Analytical models

Transmitting antennas

Integrated circuit modeling



Yingqi Zhang

South China University of Technology

Wanchen Yang

South China University of Technology

Quan Xue

South China University of Technology

Jing Huang

South China University of Technology

Wenquan Che

South China University of Technology

IEEE Transactions on Antennas and Propagation

0018926x (ISSN) 15582221 (eISSN)

Vol. 70 3 1989-1998





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