A Low-Profile Broadband Filtering Antenna and Its Array for 5G Applications
Rui Wu, Guang-Hong Wen, Fu‐Chang Chen, Jian‐Feng Li, Liang Hua Ye, Weiping Cao
Abstract
A low-profile, broadband dual-polarized magneto-electric (ME) dipole antenna and its array are proposed with filtering characteristics in this letter. The antenna consists of four aperture-coupled driven radiators, a cross-shaped patch, and two pairs of orthogonal feeding networks. Three controllable radiation nulls are introduced to achieve out-of-band suppression by loading cross-shaped patches, extending open-circuit branches, and designing special feeding networks, respectively. The measured −10 dB impedance bandwidth is 45% (3.3 GHz to 5.1 GHz), which covers the entire 5G bands of N77/N78/N79 bands. Meanwhile, the average in-band gain is 8.5 dBi, and the out-of-band suppression level is more than 15 dBi. A wideband filtering antenna array is designed for demonstration. The measured results show that the −10 dB impedance bandwidth is 45% (3.3 GHz to 5.1 GHz), and the average gain is 13 dBi with stable radiation characteristics within the whole band, which is a suitable choice for 5G base station applications.