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A Compact Dual-Polarized Filtering Antenna with Steep Cut-Off for Base-Station Applications

Liu, Xuekang, Gao, Steven, Hu, Wei, Wen, Lehu, Luo, Qi, Sanz-Izquierdo, Benito, Chen, Ziaodong, Quan, Long, Tetuko Sri Sumantyo, Josaphat, Yang, Xue-Xia and others. (2022) A Compact Dual-Polarized Filtering Antenna with Steep Cut-Off for Base-Station Applications. IEEE Transactions on Antennas and Propagation, 70 (7). pp. 5941-5946. ISSN 0018-926X. (doi:10.1109/TAP.2022.3161280) (KAR id:103047)


A dual-polarized filtering antenna with steep cut-off and compact size is developed for base station applications. In this design, four controllable radiation nulls are obtained by utilizing split rings, slotted T-shaped branches, a single-stub tuner, and a parasitic loop. Split rings are firstly used as the dipole arms to obtain the 1st radiation null at upper out-of-band. Four T-shaped branches working as DGS are printed under the crossed dipoles to achieve the 2nd radiation null. The connected outer conductors of the differential feed structure acting as a single-stub tuner can provide the 3rd radiation null to further enhance the upper-band rejection. Finally, a parasitic loop is incorporated around the split rings, and the out-of-band rejection of the lower-band is further enhanced by the 4th radiation null. More importantly, the impedance bandwidth of the antenna can be expended with two newly introduced resonant modes. As a result, a compact filtering antenna with a wide operational bandwidth of 1.7- 3.01 GHz (56%) is realized for |Sdd11| < -15 dB with the isolation higher than 38 dB. The out-of-band suppression is higher than 18.4 dB in 3.1-4.5 GHz and more than 47 dB in 0.8-1.1 GHz.

Item Type: Article
DOI/Identification number: 10.1109/TAP.2022.3161280
Additional information: For the purpose of open access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission.
Uncontrolled keywords: Base station antenna, dual-polarized antenna, steep cut-off, filtering antenna
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK5101 Telecommunications
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Funders: Engineering and Physical Sciences Research Council (
Huawei Technologies (United Kingdom) (
Depositing User: Xuekang Liu
Date Deposited: 28 Sep 2023 10:16 UTC
Last Modified: 29 Sep 2023 08:42 UTC
Resource URI: (The current URI for this page, for reference purposes)

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